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1
Cruz-Ramos, Carlos A., Roger Orellana, and Manuel L. Robert. "Agave Research Progress in Yucatan." University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/554189.
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The Center for Scientific Research of Yucatan carries out research aimed at solving some of the problems posed by the henequen industry in northern Yucatan. This paper briefly describes CICY's main research lines related to the hard fiber-producing agaves: a) taxonomic studies are being pursued to obtain a better understanding of the flora of the region; b) tissue culture techniques are used for the genetic improvement of agaves, and c) studies of composite materials and chemical substances derived from Henequen wastes are being carried out as possible alternatives to cordage production.
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Aranda, Ligia Esther. "Protecting CHAAC's gift--groundwater protection in Yucatan, Mexico." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/63206.
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Norris, Caroline N. "Development of MRI-based Yucatan Minipig Brain Template." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89642.
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Yucatan minipigs have become increasingly common animal models in neuroscience where recent studies, investigating blast-induced traumatic brain injury, stroke, and glioblastoma, aim to uncover brain injury mechanisms [1-3]. Magnetic Resonance Imaging (MRI) has the potential to validate and optimize unknown parameters in controlled populations. The key to group-level MRI analysis within a species is to align (or register) subject scans to the same volumetric space using a brain template. However, large animal brain templates are lacking, which limits the use of MRI as an effective research tool to study group effects. The objective of this study was to create an MRI-based Yucatan minipig brain template allowing for uniform group-level analysis of this animal model in a standard volumetric space to characterize brain mechanisms. To do this, 5-7 month old, male Yucatan minipigs were scanned using a 3 Tesla whole-body scanner (Siemens AG, Erlangen) in accordance with IACUC. T1-weighted anatomical volumes (resolution = 1×1×1 mm3; TR = 2300 ms; TE= 2.89 ms; TI = 900 ms; FOV = 256 mm2 ; FA = 8 deg) were collected with a three-dimensional magnetization prepared rapid acquisition gradient echo (MPRAGE) pulse sequence [4]. The volumes were preprocessed, co-registered, and averaged using both linear and non-linear registration algorithms in AFNI [5] to create four templates (n=58): linear brain, non-linear brain, linear head, and non-linear head. To validate the templates, tissue probability maps (TPMs) and variance maps were created, and landmark variation was measured. TPMs computed in FSL [6] and AFNI show enhanced tissue probability and contrast in the non-linear template. Additionally, variance maps showed a more uniform spatial variance in the non-linear template compared to the linear. Registration variation within the brain template was within 1.5 mm and displayed improved landmark variation in the non-linear brain template. External evaluation subjects (n=12), not included in the template, were registered to the four templates to assess functionality. The results indicate that the developed templates provide acceptable registration accuracy to enable population comparisons. With these templates, researchers will be able to use MRI as a tool to further neurological discovery and collaborate in a uniform space.M.S.
Magnetic resonance imaging (MRI) is commonly used in neuroscience as a non-invasive diagnostic tool with the potential to reveal unknown brain injury mechanisms. MRI is particularly useful in large animal models to validate and optimize unknown parameters in controlled populations. The key to group-level MRI analysis within a species is to align (or register) subject scans to the same volumetric space using a brain template. However, large animal brain templates are lacking, which limits the use of MRI as an effective research tool to study group effects. The objective of this study was to create an MRI-based Yucatan minipig brain template allowing for uniform group-level analysis of this animal model in a standard volumetric space to better characterize brain mechanisms. The neuroanatomy of the Yucatan minipig, which is characterized by an increased brain size and gyrencephalic intricacies similar to humans, has made it an increasingly common animal model in neuroscience. Linear and non-linear registration methods were performed in Analysis of Functional NeuroImages (AFNI) software to create both brain and head templates for 5-7 month old, male Yucatan minipigs (n=58). This study was validated looking at template variance, tissue probability maps (TPMs) of segmented grey matter, white matter, and cerebrospinal fluid, and landmark variation. The results indicate that the developed templates provide acceptable registration accuracy to enable population comparisons. With these templates, researchers will be able to use MRI as a tool to further neurological discovery and collaborate in a uniform space.
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Nava, Alejandro Flores. "Water resources and freshwater aquaculture development of Yucatan, Mexico." Thesis, University of Stirling, 1990. http://hdl.handle.net/1893/17762.
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The suitability of aquaculture for inland water bodies in the State of Yucatan, a karstic area of southeast Mexico was investigated. Five types of water bodies distinct in morphometric and hydrological characteristics were identified through land-based surveys. Representative sites for each were selected for further study: a sinkhole, a permanent aguada (clogged sinkhole), a rain-filled seasonal pond, a small <1 ha) gravel quarry and a large (>9 ha) gravel quarry. The water quality in all of the sites had a high pH (range 7.2-9.4) alkalinity (range 130-840 mg/l CaC03) and hardness (range 198-998mg CaC03). Their nutrient status varied from the permanently stratified and hypereutrophic conditions in the permanent aguada, to oligotrophic conditions in gravel quarries. In general, the water quality resulted adequate for fish culture in the gravel quarries, the sinkhole and in the seasonal pond, but ecological considerations prevented sinkholes for aquaculture development. Aquaculture trials involving the stocking of fry of the native cichlid Cichlasoma urophthalmus and O. niloticus in seasonal ponds and a small gravel quarry demonstrated the feasibility of neglected water bodies for small-scale aquaculture. A net yield of 180 Kg/ha/6 months was obtained from a gravel quarry fertilised with grass Panicum virgatum and stocked with C. urophthalmus. Yields from seasonal ponds were 157Kg/ha of O. niloticus from a small (0.010 ha), and 30 kg/ha of C. urophthalmus from a large (1.11 ha) seasonal pond (no fertilisation or feeding. An environmental impact assessment was carried out at an experimental cage site in gravel quarry. An estimated 0.02 kg of phosphorus was wasted per kg fish produced. A socioeconomic survey on attitudes towards aquaculture adoption was carried out in four agricultural villages and a fishing port. This led to the construction and operation of a small pond demonstration unit. Results suggest that farmers are receptive and adoption of aquaculture as a complementary activity may be feasible and beneficial to rural development, especially in areas with existing water bodies. Economic modelling of the different production units involved showed returns to labour higher than the average agricultural wage. A computer-based Geographical Information System identified areas suitable for aquacultural development. Two major areas were identified: the northern Karst plains where gravel quarries are abundant and suitable for intensive cage-culture; and the southern hilly region where small-scale seasonal aquaculture could be developed.
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Dajer-Abimerhi, Alfredo Francisco Javier. "Bovine brucellosis : serodiagnosis, epidemiology and control in Yucatan, Mexico." Thesis, Royal Veterinary College (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428571.
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Villers, Ruiz Maria de Lourdes. "Réaménagement de la région du Henequen au Yucatan (Mexique)." Paris 1, 1989. http://www.theses.fr/1989PA010589.
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Dans la region du henequen 44 000 paysans mayas s'adonnent a la culture exclusive de cette plante, cette region s'etend sur 13 653 km2 dans le nord-ouest du yucatan. Elle est consideree comme une zone productive et socialement homogene, cependant nous assistons a un eclatement de la region provoque par une crise apparue dans les annees 60, de cette culture dominante. Le henequen est connue sous le nom de sisal au niveau international. Notre interet porte sur le declin de la monoproduction de la fibre naturelle et sur les changements que celui-ci entraine au niveau spatial ainsi que sur ses incidences productives, sociales et naturelles. Deux grandes zones ont ete reperees : la zone est, traditionnelle monoproductrice de la fibre, et la zone ouest, que presente une tendance a la production commerciale d'agrumes et de plantes maraicheres. Ces zones correspondent a deux sur les quatre reperees lors de notre caracterisation du milieu physique naturel. L'impact sur le milieu naturel des deux pratiques agricoles distinctes a ete mesure d'apres le degre de regeneration de la foret. L'une correspond a l'agriculture de subsistance, l'autre a la monoculture du henequen. Nous avons remarque un deuxieme impact : la salinite de l'eau souterraine est augmentee du au sur-pompage d'eau pour la production maraichere sur la cote nord de la regionThe henequen-growing district of yucatan covers an area of 5060 square miles in the north-western part of the province. It is predominantly devoted to the cultivation of the plant by 44 000 maya indians, and has a reputation for social homoqeneity. The district, however, is now coming apart under the strains of an economic crisis which first hit the market for natural fibres in the 1960s and is now posing a threat to the plantation farming of that agave. Know as a sisal in international circles. Our interest was in the decline in the exclusive production of the natural fibre and in the changes which have come about in land usage as a result of this decline, whose effects on production, society, and nature were also studied. Two main areas were identified - the eastern area, traditionally given over to the exclusive production of the fibre and western area with a tendency to the commercial production of citrus fruit and market-garden vegetables. These areas are only two of the four identified in our characterization of the natural physical environment. The impact on the natural environment of the two separate farming techniques involved was measured by the degree of regeneration of the forest. We noticed an impact of another kind : the salinity of underground water is increased by the over-pumping of water for market-garden produce on the north coast of the district
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Miranda, Veronica. "REPRODUCING CHILDBIRTH: NEGOTIATED MATERNAL HEALTH PRACTICES IN RURAL YUCATAN." UKnowledge, 2017. http://uknowledge.uky.edu/anthro_etds/25.
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This ethnographically informed dissertation focuses on the ways rural Yucatec Maya women, midwives and state health care workers participate in the production of childbirth and maternal health care practices. It further addresses how state health programs influence the relationships and interactions between these groups. Although childbirth practices in Yucatan have always been characterized by contestation, negotiation and change, their intensity and speed have significantly increased over the last decade. Drastic changes in the maternal health of rural indigenous communities in Mexico and throughout the world are directly connected to intensified state interventions that favor biomedicine over traditional health systems. In rural Yucatan, state health programs such as Oportunidades and Seguro Popular support a biomedical approach to birth by distributing medical resources to government clinics/hospitals and encouraging program participation of poor women through conditional cash incentives.
This dissertation seeks to interrogate changing childbirth practices in a rural indigenous community in Quintana Roo, MX to gain a deeper understanding of the complex politics that shape local understandings and approaches to childbirth. It further explores how shifting social relations and political alliances are created within the context of reproductive health. This ethnography highlights how Yucatec Maya women envision a productive, yet negotiated, relationship with the state that allows them control of their prenatal and maternal health while engaging with state health programs. Focusing on the cultural production of childbirth in a rural community in southwestern Quintana Roo, this research seeks to explore the dynamic ways in which indigenous communities are reproduced over time through moments of engagement and contestation with the state. The Maya women in this dissertation exist at the margins of the Mexican government’s concerns, policies, and resources. Yet, even at the margins the influence and power of state ideology and policies intimately affect the lives of rural indigenous women. The core argument of this dissertation is that these women, who rely on traditional and historical experience, create strategies for survival and social reproduction despite their marginalized position within the Mexican state.
This research draws from over a decade of fieldwork. Predissertation fieldwork took place during the summer months of 2002, 2003, 2004, 2007, 2008, and 2010. I completed my dissertation fieldwork from January to October of 2013. During that time, I conducted 60 formal and informal interviews and a small survey. Additionally, a large portion of my research took place with a local family that consisted of female healers and health educators, whom I extensively interviewed and conducted hundreds of hours of participant observation. The family was the locus of authoritative knowledge in the community and they provided vital insights into community life and local understandings and approaches to reproductive health. This dissertation follows the Latin American tradition of using testimonios to articulate—and reflexively examine—the layered meanings and intersecting politics that shape changing childbirth practices in rural Yucatan.
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Sweetwood, Ryan V. "The Maya Footprint: Soil Resources of Chunchucmil, Yucatan, Mexico." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2323.pdf.
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Pierrebourg, Fabienne de. "L'espace domestique maya : une approche ethnoarchéologique au Yucatan (Mexique) /." Oxford : Archaeopress, 1999. http://catalogue.bnf.fr/ark:/12148/cb371176362.
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Cunill, Caroline. "«Nos traen tan avasallados hasta quitarnos nuestro señorío»: cabildos mayas, control local y representación legal en el Yucatán del siglo XVI." Pontificia Universidad Católica del Perú, 2016. http://repositorio.pucp.edu.pe/index/handle/123456789/121746.
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In Spanish Colonial America, as well as in the Iberian Peninsula at the same time, different jurisdictions intertwined in the same space. By way of consequence, the complex political organization of the New World was composed, at the local level, by the Indian and Spanish Councils, the doctrines, and the provincial structures called corregimientos. Although the officials of those institutions received precise instructions, in which the Spanish Crown defined and limited their functions, tensions were common between the Indian governors, the clergymen, the Spanish Councils’ officeholders, and the Spanish provincial magistrates, or corregidores. The present article will analyze a series of lawsuits that occurred in sixteenth century Yucatan and in which those authorities were implicated, in order to highlight not only the nature of the jurisdictional conflicts, but also the modalities of their resolution at stake in the Spanish Empire’s courts of justice. Special emphasis will be put on the jurisdiction of the Maya Councils with the objective of better understanding the scope of indigenous agency in Spanish Colonial America. We argue that the local control on the one hand, and the legal representation on the other, were key elements in these processes.Al igual que en la península ibérica, en la América colonial se superpusieron distintas jurisdicciones en el mismo espacio, de modo que el complejo entramado político del Nuevo Mundo estaba conformado, a nivel local, por los cabildos indígenas y españoles, las doctrinas y los corregimientos. Aunque los representantes de aquellas instituciones recibieron detalladas instrucciones en las que la Corona española definía y limitaba sus funciones y prerrogativas, fueron frecuentes las tensiones entre los gobernadores indígenas, los alcaldes ordinarios, los curas beneficiados y los corregidores. A partir de una serie de pleitos en los que estuvieron involucradas estas autoridades, el presente trabajo analiza tanto la naturaleza de los conflictos jurisdiccionales que tuvieron lugar en el Yucatán del siglo XVI como las modalidades de su resolución en los foros de justicia de la Monarquía hispana. Se presta especial atención a la jurisdicción de los cabildos mayas con el fin de esclarecer el alcance de la participación indígena en el sistema político del Imperio hispánico. Consideramos que el control local, por un lado, y la representación legal, por otro, resultan fundamentales para comprender aquellos fenómenos.
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Coakley, Corrine. "Activity Space in a Terminal Classic Maya HouseholdXuenkal, Yucatan, Mexico." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1406544634.
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Moheno, Martha Bonilla. "Forest recovery and management options in the Yucatan peninsula, Mexico /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.
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Guzmán, Vázquez Carmen Angélica. "La valeur du paysage de la méliponiculture dans la Péninsule du Yucatán." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/30325.
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Ce travail présente l’analyse des aspects naturels, culturels et socio-économiques autour du
développement de la méliponiculture dans la Péninsule du Yucatán dans le but d’identifier les
valeurs associées au paysage dans lequel se déroule cette activité, à partir de l’étude d’une espèce
d’abeille caractéristique de la région qu’est Melipona beecheii.
La structure se concentre sur 4 parties, en partant d’une analyse de divers aspects de
l’environnement dans lequel se développe la méliponiculture, en reconnaissant également des
aspects historiques et culturels autour de la pratique, en distinguant aussi même des implications
socio-économiques de la région en ce qui concerne la collecte des produits de ruche, et se
terminant par une lecture du paysage autour de la méliponiculture dans la Péninsule du Yucatán
comme confluence des aspects analysés; The value of the meliponiculture landscape on the Yucatan Peninsula
Abstract:
This work presents the analysis of natural, cultural and socio-economic aspects around the
development of meliponiculture in the Yucatan Peninsula with the objective of identifying the
values associated with the landscape in which this activity takes place, from the study of a species
of bee characteristic of the region that is theMelipona beecheii.
The structure focuses on 4 parts, based on an analysis of various aspects of the environment
in which the meliponicultura is developed, as well as recognizing historical and cultural aspects
around the practice, also distinguishing the socio-economic implications of the region with
respect to the collection of hive products, and concluding with a reading of the landscape around
the meliponiculture in the Yucatan peninsula as a confluence of the aspects analyzed; O valor da paisagem da meliponicultura na península de Yucatán
Resumo:
Este artigo apresenta a análise dos aspectos naturais, culturais e socioeconômicos em torno do
desenvolvimento da meliponicultura na Península de Yucatán com o objetivo de identificar os
valores associados à paisagem em que esta atividade ocorre, a partir do estudo de uma espécie de
abelha característica da região que é a Melipona beecheii.
A estrutura centra-se em 4 partes, partindo de uma análise dos diversos aspectos do ambiente
em que a meliponicultura se desenvolve, assim mesmo reconhecendo aspectos históricos e
culturais em torno da prática, distinguindo também as implicações socioeconómicas da região no
que diz respeito à recolha de produtos da colmeia, e finalizando com uma leitura da paisagem em
torno da meliponicultura na península de Yucatán como confluência dos aspectos analisados.
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Estrella, E. Pablo A. "A conceptualization of pastors in the Yucatan area about church growth." Theological Research Exchange Network (TREN), 1985. http://www.tren.com.
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Cubas, Atienzar A. I. "Epidemiology of Toxoplasma gondii in the pig industry of Yucatan, Mexico." Thesis, University of Salford, 2016. http://usir.salford.ac.uk/40985/.
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Toxoplasmosis is a worldwide distributed parasitic disease caused by the zoonotic pathogen Toxoplasma gondii. Serological studies have estimated that more than 30% of the human population has been exposed to this protozoan. T. gondii is considered a leading cause of death attributed to foodborne illness. The consumption of infected pork meat is suggested to be an important source for human infection. However, the prevalence of T. gondii in pigs vary greatly between countries, the reasons for this heterogeneity has been addressed to the differences in climate distribution, environments, husbandry systems and fam management. The geographical location of this study is Yucatan, a state located in the south-east of Mexico. Yucatan is considered an endemic area of toxoplasmosis; the last National Seroepidemiological Health Survey (NSHS) revealed more than 70% of prevalence among the human population. Numerous studies suggested that the consumption of pork in this geographical area may be a major source of T. gondii. The aims of this study were to investigate the disease levels in the pig industry of Yucatan, assess an in-home ELISA widely used in this area (ELISA kit Human- GmbH, WB), study the risk factors associated with the disease in theses pig farms and evaluate the contamination with T. gondii in pork meat intended for human consumption. To do that, swine blood samples were collected through a cross-sectional age stratified opportunistic sampling of 12 farms across the state during the year 2014. Farm management and characteristics were obtained by interviewing farmers. In addition, meat and blood samples were collected from a local abattoir from 2013 to 2015. Anti - T. gondii IgG antibody levels were investigated with the well validated MAT (Modified Agglutination Test), with an ELISA (Enzyme-Linked Immunosorbent Assay) for use on pig serum (ID Screen ®, IDVet) and with the gold standard Dye test. The overall seroprevalence was 1.4% (95%CI: 0.6%-2.7%) among 632 pigs sampled. This seroprevalence increased with age (p < 0.05), reaching the 11.5% (95% CI: 2.5%-30%) in pigs older than 20 weeks. The seroprevalence was even higher, 17.8% (95% CI: 6%-37%), in slaughtered animals (n=34). In addition, T. gondii prevalence was investigated using a highly sensitive nested PCR protocol targeting the SAG1 gene. PCR diagnosis revealed the high frequency of 21.2% (CI: 18%-24.6%) of T. gondii DNA circulating in the blood of these pigs (n=632). Furthermore, MLST (Multi-Locus Sequence Typing) of four alleles (SAG1, SAG2, SAG3 and GRA6) allowed, for first time in Yucatan, genetic diversity to be assessed. Data revealed the presence of high genetic diversity among T. gondii strains of this geographical area with shared alleles to strains from both North and South/Central America origin. Moreover, a relatively high number of pigs presented multiple infections with different T. gondii strains suggesting high levels of T. gondii transmission on the intensive pig farms sampled. The frequency of T. gondii DNA was also investigated in pig tongues sampled at the abattoir of which 38.2% (95% CI: 22%-56.4%) were shown to harbour T. gondii DNA in their tissue. The viability of the parasite was also investigated in the tongues intended for human consumption and a total of 8.8% (95% CI: 1.8%-23%) were shown to have viable T. gondii using a mouse bioassay. However, the agreement between serology, PCR and mouse bioassay was low (k=0.12-0.29). Due to the risk of underestimating T. gondii infection by using solely one diagnostic method, a combination of indirect (serology) and direct methods (PCR or/and bioassay) is preferred for a robust diagnosis. This study was pioneering in using a serological test validated in pigs in the state of Yucatan and the data revealed a much lower prevalence than previously reported (95.8%-100%) in market age pigs (Ortega-Pacheco et al., 2013, Hernández- Cortazar et al., 2016a). Although a more optimistic view is obtained; due to the potential of T. gondii to lead to severe illness, measures to control the disease should still be taken. Furthermore, questionnaire results suggested the need for an improvement to the sanitary management of the pig farms of this geographical area not only to prevent T. gondii transmission but also that of other pathogens of zoonotic significance.
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Hopkins, Allison Louise. "Medicinal plant remedy knowledge and social networks in Tabi, Yucatan, Mexico." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041175.
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Larsen, Zachary S. "Thin Soils and Sacbes: The Soil Resources of Uci, Yucatan, Mexico." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3505.
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The objective of this study was to use pedological evidence in conjunction with Geographic Information Systems, and soil physical and chemical analyses as means to better understand the agricultural landscape surrounding the ancient Maya city of Uci. Specifically, the query of this thesis is to determine whether there is an association between settlement density and soil resources, and what relationship if any there is between the ancient sacbe of Uci and its surrounding agricultural potential. Stable carbon isotope analysis of the humin fraction of the soil organic matter was conducted on several profiles from karst depressions known as rejolladas near the site center, and from a select number of sufficiently deep profiles along and surrounding the ancient sacbe, and from beneath ancient structures. A strong C isotopic signature of ancient C4 crops was found in a limited number of profiles while a majority of the profiles showed no evidence, or little to inconclusive evidence due to a mixture of C3 and C4 plants in the natural landscape. A majority of the soils surrounding Uci are shallow to extremely shallow and many profiles sampled and studied did not allow for C isotopic analysis. Isotopic evidence along with other soil chemical and physical characteristics suggests that settlement density was linked to soil resources, specifically in the case of the rejolladas proximity to the Uci site center. However, it does not appear that the construction and location of the sacbe was linked to its surrounding soil resources or agricultural potential even though ancient maize crops may have been cultivated sporadically close to the sacbe and nearby structures. The soil resources of Uci are not conducive to the production of large maize crops and the ancient Maya of this area likely utilized maize along with alternative crops, arboriculture, wild game and trade to sustain its population.
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Novak, Matthew J. "Sedimentology and Community Structure of Reefs of the Yucatan Peninsula, Mexico." DigitalCommons@USU, 1992. https://digitalcommons.usu.edu/etd/6698.
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Holocene carbonate sediments from Mexican reefs in the Caribbean and Gulf of Mexico display variations in constituent composition, texture and mineralogy which are related to their locations on the reefs. Samples were collected at barrier reef environments at Akumal and Chemuyil, on the northeast coast of the Yucatan Peninsula; at the oceanic atoll of Chinchorro, off the southeast coast of the peninsula; and at the shelf atoll of Alacranes, in the Gulf of Mexico. Samples were collected through a depth range of 0-40 m, which encompasses back reef, shallow fore reef, and deeper fore reef environments.
Constituent-particle analysis of reef sediments indicates that lagoon facies are dominated by Halimeda with lesser amounts of coral and coralline algae. In contrast, fore reef facies are dominated by coral, with lesser amounts of Halimeda and coralline algae.
Greater than 90% of the sediments (dry weight) occur in the interval 0.125-2.00 mm, with mean grain sizes (Mz) approaching 0.5 mm at most sites. Mz generally decreases with increasing depth at three of the four sites. Reef sediments are moderately to poorly sorted and typically become more poorly sorted with increasing depth. Sediments collected from reef channels (grooves) are consistently better sorted than those from the reef interstices (spurs).
Mineralogically, the sediment is predominantly aragonite (63-93%) and high-Mg calcite (3-33%), with minor amounts of low-Mg calcite (3-9%). The sediment is chiefly composed of these three polymorphs of CaC03 (96.32- 99.83%) with only a small percentage of insoluble (non-carbonate) material. The non-carbonate fraction of the sediment is dominated by organics (0.14-3.16%) with lesser amounts of clay minerals and amorphous silica (0.00-0.66%).
Quantitative analysis of Mexican reef sediments in the Caribbean and Gulf of Mexico allows the delineation of reef zonations based on constituent-particle composition. Q-mode cluster analysis of constituent-particle data from epireefal sediments enables the separation of lagoon, shallow fore reef (10-15 m) lithofacies. These groupings were maintained even when constituent-particle data from the barrier reefs were combined, and also when data from the atoll reefs were combined. Similar cluster groupings were obtained when constituent-particle data from a Jamaican fringing reef were combined with data from the Mexican barrier reefs. This indicates that coastal reef sediments from Jamaica and Mexico are surprisingly similar in constituent-particle composition and facies zonations. However, cluster analysis failed to produce clear associations when constituent-particle data from barrier reefs and atoll reefs were combined. The sedimentological zonations observed in the study reflect the community composition of the living reefs, and indicate that community composition, at least for calcifying organisms, is potentially preservable.
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Khosh, Nevis Seyed Mehrdad. "Evaluation of treatment efficacy and safety of microbrachytherapy with holmium microparticles in porcine induced glioblastoma model." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1049.
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Evaluation de l'efficacité et de l'innocuité de la microcuriethérapie à base de microparticules d'holmium pour le traitement du gliobastome induit chez un modèle porcinAuteur: Seyed Mehrdad KHOSH NEVISMot clés: U87, miniporc, glioblastome, modèle animal, Yucatan, microcuriethérapie, Holmium-166, nanoparticulesRésumé: L’objectif de notre étude a été de tester une modalité thérapeutique moins invasive (microcuriethérapie), en phase préclinique sur un modèle animal porcin, pour le traitement du GB. 1) Nous avons développé un nouveau modèle de GB en implantant la lignée U87 dans le cerveau du miniporc (Yucatan). Les images scanner ont montré la présence de tumeurs chez tous les miniporcs. 2) Nous avons évalué l’injectabilité d’holmium non radioactif (ho-165) après injection stéréotaxique dans le cerveau de miniporcs sains. L’holmium était bien circonscrit aux zones d’injection et a été validée pour les essais ultérieurs d'injections intra-tumorales. 3) Nous avons réalisé des injections d’ho-165, directement dans la tumeur d’un modèle de GB U87. La faisabilité des injections d’ho-165 a été testée chez le miniporc en utilisant un système d’injection préclinique spécifique. Les résultats de cette étude ont montré que la suspension de nanoparticules d’ho-165 pouvait être injectée, avec précision, dans la tumeur. 4) L’étape finale a été d’évaluer l’efficacité du traitement à base de nanoparticules d’ho-166 en microcuriethérapie sur le modèle de GB du miniporc. Notre étude a démontré un très bon contrôle tumoral et l’absence d’effets toxiquesEvaluation of treatment efficacy and safety of microbrachytherapy with holmium microparticles in porcine induced glioblastoma model.Author: Seyed Mehrdad KHOSH NEVISKeywords: U87, minipig, gliobastoma, animal model, Yucatan, Microbrachytherapy, Holmium-166, nanoparticlesResumé: The aim of our study was to apply a less invasive therapeutic method (microbrachytherapy) for the treatment of GB in a preclinical phase on a suitable animal model.1) First, we developed a new model of GB in Yucatan minipig by implantation of U87 cell line in the brain. All implanted minipigs demonstrated macroscopic tumors on CT acquisitions. 2) In parallel, the injectability of the non-radioactive Holmium (Ho-165) in healthy brain was assessed. Holmium was circumscribed to the injection area and was found to be suitable for future intratumoral injections. 3) In the next step, the feasibility of injection of ho-165 was tested in minipigs GB model using specific injection system. Results showed that the ho-165 nanoparticles suspension can be injected precisely inside the cerebral tumor using our prototype injection system. 4) The final step was the evaluation of treatment efficacy using radioactive ho-166, as microbrachytherapy, in Yucatan GB model. Our trial demonstrated an excellent efficiency in tumor control and the absence of toxic effects
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Santos, Flores Jorge Santiago. "Monitoring of dual-purpose cattle farms to constraints identification in Yucatan, Mexico." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263250.
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Héraud-Piña, Marie-Anne. "Le Yucatan (Mexique) : étude de géographie physique avec l'apport des traitements d'image." Bordeaux 3, 1995. http://www.theses.fr/1995BOR30005.
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Armstrong-Fumero, Fernando. "Before there was culture here vernacular discourse on modernity in Yucatan, Mexico /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Weaver, Eric M. "Preliminary investigation of a ritual cave site in the Puuc region of Yucatán, Mexico: Actun Xcoch." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321648128.
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Brondino, Laura. "Les pouvoirs intermédiaires et la construction de l'Etat mexicain. Les jefes políticos de l'état du Yucatán (1878-1902)." Thesis, Paris 4, 2010. http://www.theses.fr/2010PA040126.
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La présente recherche étudie le déploiement de la domination hiérarchique de l’Etat mexicain dans ses espaces territoriaux au niveau local. Elle se concentre sur le cas de l’état fédéré du Yucatán. Dans l’ordonnancement politico-administratif des états fédérés du Mexique, on insère progressivement une figure intermédiaire entre le gouverneur et les municipalités, le jefe político, insertion parachevée dans le dernier quart du XIXème siècle. Celui-ci est, d’une part, l’agent de l’autorité étatique au niveau départemental (partidos) et, d’autre part, l’intermédiaire formel entre l’exécutif, les municipalités et la société, caisse de résonance des demandes locales. La bipolarité de la charge et sa nature foncièrement relationnelle permettent d’examiner l’imbrication, plutôt que l’opposition entre déploiement étatique et réalités non étatiques dans la construction de l’Etat mexicain au niveau local, afin d’élucider la spécificité de cet Etat et d’expliciter les mécanismes par lesquels le régime porfirien a pu se pérenniser en s’adaptant aux réalités socio-politiques existantes tout en les mettant à son serviceThis research studies the establishment of the hierarchical power of the Mexican State in its territories on the local scale. It focuses on the case study of the federated state of Yucatán. An intermediary civil official, the jefe político is introduced step by step between the governor and the municipal powers, this institution is achieved during the last quarter of the 19th century. He is, on the one hand, the agent of the state authority in the partidos (districts) and, on the other hand, the official intermediary between the executive power, the municipal authorities and the society, as the voice of the local requests. This double-acting office, essentially based on public relations, enables us to analyze the imbrications rather than the contrasts between the State establishment and the non-state powers in the Mexican State building, in order to clear up the specific character of the Mexican State and to explain the mechanisms by which the porfirian government could last in time by adapting to the existent socio-political actors and by using them into its service
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Sweitz, Samuel Randles. "On the periphery of the periphery: household archaeology at Hacienda Tabi, Yucatan, Mexico." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4356.
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The archaeological remains at Hacienda Tabi provide an opportunity to study the
effects of large-scale societal changes on the lives of the Maya who worked on the
hacienda. The households, represented by the ruins of the workerâÂÂs village surrounding
the main hacienda grounds, were at the core of late colonial/independence era Maya life.
These households were subject to the forces of acculturation that accompanied the rise
and supremacy of the hacienda system during the late eighteenth century.
Archaeological excavations at Hacienda Tabi have revealed a re-orientation of
social organization during this period. Prior to the formation of the hacienda system,
domestic and social organization focused on kinship and extended family subsistence
organization. Social status, wealth, and power in pre-hacienda communities were
predicated on issues of age, sex, and familial rank within both the extended family and
community. The hacienda system brought about fundamental changes in the
organization and relations of production. These changes, e.g. the separation of producer
from the means of production and commodity based production versus subsistence based
production, changed the basis and therefore the form of Yucatecan social organization. Under the new system, the nuclear family rather than the extended family or community
became the prime unit of social organization. In the hacienda community status was
based on occupation and oneâÂÂs place within the newly established labor hierarchy.
The changing realities of social organization found under the hacienda system are
reflected in the settlement patterns and material remains of the workersâ village at
Hacienda Tabi. The material culture and types of housing excavated and recorded at
Tabi underscore the inequalities engendered within the hacienda system of production.
The research conducted at Hacienda Tabi has illuminated the changes associated with
YucatanâÂÂs articulation into the greater world system.
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Torres-Acosta, Juan Felipe de Jesus. "Supplementary feeding and the control of gastrointestinal nematodes of goats in Yucatan, Mexico." Thesis, Royal Veterinary College (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312983.
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Koby, Peter J. "Spatial Analysis of Ancient Maya Settlement Near Karst Sinkholes at Xuenkal, Yucatan, Mexico." Kent State University Honors College / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1335809783.
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Bond-Freeman, Tara. "The Maya preclassic ceramic sequence at the site of Ek Balam, Yucatan, Mexico." Ann Arbor, Mich. : ProQuest, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3288942.
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Thesis (Ph.D. in Anthropology)--S.M.U., 2007.Title from PDF title page (viewed Nov. 19, 2009). Source: Dissertation Abstracts International, Volume: 68-11, Section: A, page: 4748. Adviser: David Freidel. Includes bibliographical references.
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Peniche, May Nancy. "The architecture of power and sociopolitical complexity in northwestern Yucatan during the preclassic period." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p1474763.
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Thesis (M.A.)--University of California, San Diego, 2010.Title from first page of PDF file (viewed April 14, 2010). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 82-92).
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Torres-Lara, Ricardo. "Analysis of three factors influencing the performance of fishing cooperative organizations of Yucatan, Mexico." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ61185.pdf.
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Valero, Alejandra. "Spider monkey (Ateles geoffroyi yucatanensis) travel patterns in a subtropical forest of Yucatan, Mexico." Thesis, University of St Andrews, 2004. http://hdl.handle.net/10023/2835.
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A 12-month study of the ranging behaviour of 11 spider monkeys (Ateles geoffroyi yucatanensis) was undertaken at the Otochma' ax Yetel Kooh nature reserve in the state of Yucatan, Mexico. The aims were: 1) to evaluate the relationship between ranging patterns of the monkeys and ecological features i.e. climate and food distribution, 2) to assess the efficiency of ranging patterns, and 3) to test the hypothesis that spider monkeys navigate between important sources through spatial memory of key locations. A focal animal was followed daily for as long as possible and details of its ranging patterns recorded by entering positional fixes with a GPS receiver. Behavioural states were included in the observations to link them with the geographical information recorded simultaneously. The results revealed that the ranging patterns of spider monkeys at the study site were determined by the availability of key species of fruit in the area. Ranging was efficient, as evidenced by the fact that in most instances - particularly in the dry season when food was scarce - (1) spider monkeys moved in straight lines to distant food sources, (2) were able to orient their movement toward a food source at distances that could not have been in sight from the point where directed movement originated, and (3) the successive organisation of these linear segments was consistently forward, suggesting an ability to plan ahead of the next food source visited. I present these results as evidence of the use of spatial memory to move efficiently between important sources in their environment, and I argue in favour of higher-level spatial abilities in this species of New World monkeys.
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Urquiza-Haas, Tania. "Regional-scale ecological responses to natural and anthropogenic disturbance in the Yucatan Peninsula, Mexico." Thesis, University of East Anglia, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433796.
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Smith, Samantha Lisa. "The geochemistry and geomicrobiology of a salinity-stratified coastal carbonate aquifer, Yucatan Peninsula, Mexico." Thesis, University of Bristol, 2004. http://hdl.handle.net/1983/a2264672-6bb4-44bc-a4eb-5231fd51e7f4.
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Geochemical and geomicrobiological data combined with in situ experiments and numerical modeling were used to assess the rates and distribution of modern carbonate diagenesis along the east coast of the Yucatan Peninsula platform (Mexico). The platform hosts a salinity-stratified aquifer where a thin meteoric lens is separated from underlying saline water by a well-defined mixmg zone. An extensive network of flooded caves discharges brackish lens water to the Caribbean Sea, while seawater flows into the caves at depth. Lens waters are enriched in calcium (Caxs = 2.19 ± 0.55 mM, n = 77) relative to the dilution of seawater. However, within the 'freshwater system', the majority (61 %) of CaC03 dissolution occurs in the 10 m-thick vadose zone due to high ground air pC02 (-1.18%). Caxs combined with recharge estimates indicate a vadose dissolution rate of 22.9 metric tons/km2/a (porosity generation = 8.64 xl 04%/a). Some (",,9.5% of the total) dissolution may also occur in lens waters due to organic matter oxidation, however precipitation in the upper lens via degassing and mixing with the lens base is also likely. Comparatively, dissolution potential is enhanced in the fresh-salt water mixing zone, however, geochemical modeling alone cannot explain the locus or extent of undersaturation. Model results from the mixing of brackish and saline water estimate maximum calcite undersaturation at -75% seawater (SW), while field data shows two zones of undersaturation. These zones occur near the top (-35% SW) and bottom (-95% SW) of the mixing zone and in situ dissolution experiments reveal associated enhanced calcite dissolution. The maintenance of undersaturation is driven by increases in bacterial activity (evidenced by increases in inferred reproduction rates, decreases in pH and dissolved oxygen and increases in pC02). Most bacteria are heterotrophs, although acidproducing sulfur-oxidising bacteria (SOX) may also be important in driving undersaturation. Where bacterial activity approaches zero, calcite saturation (SI-C) approaches equilibrium. Despite the thermodynamic potential for Dorag dolomitisation within some (-50-80% SW) mixing zone waters, no significant amount of dolomite is found in the associated wall-rock and Mg2+and Ca2+ concentrations are not significantly different from those expected from fresh-salt water mixing. However, replacement dolomitisation may occur in the underlying saline zone where waters are depleted of magnesium (Mgxs = -1.16 ± 3.31 mM) and enriched in calcium (Caxs = + 1.24 ± 3.01 mM) (n = 48). This study offers a unique insight into the diagenetic processes within the zone of saline groundwaters and geochemical data reveal that there are two distinct 'sub-zones': shallow «40 m water depth) and deep (>40 m). In the shallow saline zone, bacteria continue to maintain calcite undersaturation via organic matter breakdown and pC02 production, although the shallow saline ground waters remain supersaturated with respect to disordered dolomite. In this zone, dolomitisation may also be associated with the (bacterial?) re-oxidation of reduced sulfur species (S04XS= +0.82 ± 0.40 mM, n = 34). In the deep saline zone, however, sulfate enrichment is due to the dissolution of anhydrite (AN) clasts within breccia deposits located ~ 110 m below the surface (evidenced by CaXS:S04XSratios, l)34S-S0t values and SI-AN increases with depth). Concurrent Mg2+ depletions and positive Caxs (beyond that due to CaS04 dissolution) indicate replacement dolomitisation is also occurring. Petrographic results suggest wall-rock dolomite does not occur outside the saline zone, and may only occur at coastal sites, the dolomites are of seawater origin and that the amount of dolomite increases where there is interconnected porosity, reinforcing the importance of Mg-rich fluid circulation. Five shallow saline zone sites have chemistries resembling the deep saline zone. These 'outliers' may offer insight into deep saline zone circulation patterns, where upwelling of geothermally-heated water occurs through regions of increased cavernous porosity rock in response to outflowing lens waters at low tide. This brackish water outflow also results in a compensatory east to west inflow of seawater at depth. This circulation 'pattern' explains the previously unexplained co-variance of maximum saline groundwater inflow rates with low tide and minimum inflow rates with high tide.
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Dupiech, Cavaleri Danielle. "Analyse d'une tradition textile maya du Yucatan (XXIe siècle) : usages rituels et codes symboliques." Paris, EHESS, 2014. http://www.theses.fr/2014EHES0622.
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Contraintes d'abandonner au XVIe siècle le brochage de motifs chargés de symbolisme pour se consacrer à la réalisation de toiles lisses destinées à payer le tribut aux espagnols, les femmes mayas du Yucatan ont du s'adapter et mettre en place des stratagèmes pour perpétuer leur univers comogonique véhiculé par les textiles. De nos jours, le désintérêt des jeunes générations de brodeuses pour les textiles, la prolifération de motifs floraux stylisés au détriment des traditionnels motifs géométriques et zoomorphes ainsi que l'abandon progressif du port du hipil (vêtement traditionnel) témoignent de la disparition d'un pan entier du contenu culturel inscrit dans les textiles. Les informations obtenues lors des enquêtes menées durant plus de quatre années auprès d'une vingtaine de vieilles brodeuses âgées de 50 à 107 ans dans les villages de Mani, Xaya, Xocén et Xohuayan au Yucatan et les résultats de l'observation de l'usage des textiles à l'occasion des fêtes patronales, de rites agricaoles, de l'hanal pixan ont permis d'établir la continuité de la relation mythique liant la femme, le textile et lma fertilité depuis les temps les plus reculés en Mésoamérique. L'analyse de cette tradition textile contemporaine a été facilitée par une approche pluridisciplianire faisant appel à l'archéologie, l'histoire, l'ethno-histoire, l'ethnologie et la linguistique pour démontrer comment les textiles du XXIe siècle participent toujours des rituels ponctuant la vie religieuse des mayas et pourquoi et comment les motifs que les femmes brodent sur leurs hipiles our sur les servilletas et manteles (textiles à usage cérémoniel) ont encore valeur de symboles pour les vieilles brodeuses mayas.
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De, la Barreda Bautista Betsabe. "Vegetation sensitivity to droughts (1982-2011) through remote sensing in the Yucatan Peninsula, Mexico." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39822/.
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Ecosystems undergo permanent alteration and degradation as a result of the pressure exerted upon them by anthropogenic activities and natural causes. Amongst the natural causes, drought can have considerable impacts on vegetation productivity; these impacts include biomass reduction and changes in vegetation cycles, growth, and vitality. Such impacts have important implications for society, and understanding the impacts of drought in natural systems will help minimise vulnerability to it. The Yucatan Peninsula is a vulnerable area in climate change scenarios, where increased intensity and frequency of droughts is already occurring. This thesis aims to analyse how droughts impact upon vegetation on the Yucatan Peninsula, Mexico using both remotely sensed data (in particular the Advanced Very High Resolution Radiometer – AVHRR - data) and meteorological data (in situ precipitation data). Three major elements are addressed: (1) spatial and temporal precipitation variability, and the occurrence of droughts during the period 1980-2011; (2) vegetation productivity trends, focusing on the persistence and resilience of the different vegetation types present across the Yucatan Peninsula using remotely sensed data sets, specifically, the Normalised Difference Vegetation Index (NDVI) from the National Oceanic and Atmosphere Administration Advanced Very High Resolution Radiometer (NOAA-AVHRR) as a proxy for productivity in the period 1982 to 2011; and (3) the relationship between vegetation productivity and rainfall and the lack of it (i.e. droughts) at a more detailed temporal scale (monthly) with two vegetation indices (NDVI from AVHRR and MTCI from the MEdium Resolution Imaging Spectrometer (MERIS)). The main findings indicate that precipitation in the area follows a gradient from north to south which is linked to vegetation types in the area, from deciduous forest to evergreen forest. NDVI trends in the Yucatan Peninsula are generally stable during the period 1980-2011; however, negative trends are persistent in areas where human impacts and intensive agriculture are present. Analysis of resilience also shows that deciduous forest and grasslands are much less resilient to disturbance and have a longer recovery period compared to other vegetation types. Per-pixel regression analysis between precipitation and vegetation productivity shows high explained variances between NDVI and rainfall with a time-lag of 1 and 2 months and tropical dry forest is the biome most affected by droughts. These results are valuable for decreasing the vulnerability of the Yucatan Peninsula and they could be used for increasing the understanding of the area and therefore go further in the creation of warning and management programmes.
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Lazos, Chavero Elena. "Du mai͏̈s à l'orange : transformation de la structure agraire, développement et crise agricole d'une région mexicaine (Oxkutzkab, Yucatan)." Paris, EHESS, 1992. http://www.theses.fr/1992EHES0011.
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Les causes et consequences de la transformation de la societe agraire du sud du yucatan constituent l'axe de cette recherche. La societe maya-yucateque a ete marquee depuis le debut de ce siecle par le developpement rapide d'un secteur irrigue de cultures commerciales fruitieres (orange. . . ) et maraicheres d'une part, et par la crise prolongee du secteur des cultures alimentaires de base (mais, haricot) d'autre part. L'etude de la dynamique des systemes agraires nous permet de comprendre la conversion des systemes de cultures vivrieres en systemes de cultures commerciales. Cette situation est le resultat d'une politique national d'ncouragement des cultures commerciales grace aux infrastructures et au credit, alors que les cultures vivrieres ont ete constamment negligees et soumises a la concurrence des importations a bas prix des pays developpes. Les consequences de cette transformation sur les rapports sociaux s'expriment au niveau des rapports de parente, de "compadrazgo" et de clientelisme. Ceux-ci reglent l'acces aux ressources (terre, irrigation, credits) et a la commercialisation. La crise economique, l'influence de la societe de consommation, la modernisation, l'entree des sectes protestantes et la politique indigeniste mexicaine ont joue un role decisif dans l'evolution culturelle contradictoire de la paysannerie maya-yucatequeThe causes and the consequences of the transformation of the agrarian society in the south of yucatan are the main focus of this research. The mayan-yucatecan society has been marked since the beginning of this century by the implusive development of irrigated commercial crops (fruits, mainly oranges, and vegetables), accompanied by the prolongated crisis of maize and associated crops. The analysis of the dynamics of agrarian systems permits us to understand the transformation from traditional agriculture towards commercial agriculture. The evolution of social relations expressed by the organisation of the family and the community, by the kinship and "compadrazgo" system and by the clientelistic relations clarifies regulations involved in the acces to ressources (land, irrigation, credits) and commercialisation. The economic crisis, the influence of consumer society, regional modernisation, governmental policy towards ethnic cultures in liason with the arrival of protestant sects conjointly have been the principal instigators of the contradictory evolution of mayan culture
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Lopez-Canto, Leonor Elena. "La construction sociale d'un réseau hospitalier régional public au Mexique : la cas de la Péninsule du Yucatan." Pau, 2011. http://www.theses.fr/2011PAUU2008.
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The mexican government proposed the creation of 18 regional healthcare networks, as an alternative for the improvement of the health system. One of these networks is the object of this thesis : the regional healthcare network of the Yucatan Peninsula, also called regional hospital network, situated in the south-east of the Mexican Republic. This study was done under the systemic perspective, the research being underpinning by the interpretative paradigm. It was found in this research that the transformation towards such a new organizational form requires very deep changes in three levels : meta-organizational, inter-organizational and organizacional. In each level four main factors are acting and conditionning the development of the network : power and politics, structure and capacities of the health system, the design of the healthcare network and actors' participationLe gouvernement fédéral mexicain a proposé la création de 18 réseaux régionaux de santé comme alternative organisationnelle en vue d'améliorer le niveau de service du système. L'un de ces réseaux est étudié dans cette thèse : le réseau régional de santé de la Péninsule du Yucatan, également appelé réseau hospitalier régional et situé dans le sud-est de la république mexicaine. L'étude du phénomène étudié est abordée dans la perspective systémique, se fondant sur le paradigme interprétativiste. Un des résultats de ce travail est de mettre en à jour que la transformation vers cette nouvelle forme organisationnelle demande des changements profonds sur trois niveaux : méta-organisationnel, inter-organisationnel et organisationnel. Dans chacun d'entre eux, on identifie quatre grands facteurs qui conditionnent le développement du réseau : le pouvoir et la politique, la structure et les capacités du système de santé, la conception du modèle de "réseau" et la participation des acteurs
El gobierno federal mexicano ha propuesto la creación de 18 redes regionales de atención a la salud, como alternativa organizacional para mejorar la actual capacidad resolutiva del sistema. Una de estas redes es estudiada en esta tesis : la red regional de salud de la Península de Yucatán, también denominada red hospitalaria regional, ubicada en el sureste de la República Mexicana. Se abordó el estudio del fenómeno mediante la perspectiva sistémica y el pradigma que guió la indagación es el interpretativo. Se encontró que el tránsito hacia esta nueva forma organizacional representa cambios profundos en tres niveles : meta-organizacional, interorganizacional y organizacional ; en todos ellos se encuentran presentes cuatro grandes factores que están condicionando el desarrollo de la red : el poder y la política, la estructura y capacides del sistema de salud, el diseño del modelo de "red", y la participación de los actores
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Nadal, Marie-José. "Les femmes Mayas et le développement, genre, rapports sociaux, rapports de sexe au Yucatan, Mexique." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq26706.pdf.
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Gómez, García Paola. "Assessing habitat availability and connectivity for the Jaguar «Panthera onca», in the Yucatan peninsula, Mexico." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107804.
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Current trends in biodiversity conservation are based on maintaining suitable habitat conditions not just within protected areas, but also on adjacent, sustainably managed lands. This is especially challenging for the conservation of large carnivores such as the jaguar that require connected habitats to minimize extinction risks and facilitate movement while minimizing conflicts with humans. This study provides spatially explicit habitat information for jaguar management and the implementation of corridors linking its populations in the Yucatan peninsula, Mexico, an area of international significance for the species. First, both comprehensive and sex-based habitat suitability models based on jaguar occurrence records and a combination of land use and land cover (LULC), distance to infrastructures (human settlements and roads), and climate (mean annual precipitation) were constructed using MaxEnt. Then, this information was used to derive a cost surface for mapping suitable corridors, linking four locations (nodes) where current jaguar observations were concentrated. The performance of all models was excellent, but slightly higher for either the female (AUC = 0.928±0.014), or the male (AUC = 0.942±0.042) models than for the comprehensive one (AUC = 0.889±0.047), despite its larger sample size. While LULC was a better predictor for the female model, all models showed that highly suitable areas were scarce in the region and were mostly associated with tropical evergreen forests. Suitable habitat patches were more fragmented for the male or comprehensive models than for the one for females only. Five potential corridors of varying quality have been identified between the population nodes, the best one being from Calakmul to Sian Ka'an along the eastern Caribbean coast, followed by Sian Ka'an to Ria Lagartos. The corridor connecting northern locations from Ria Lagartos to Ria Celestun had the poorest habitat conditions. The suitable habitat models and corridors support the potential value for conservation of productive lands under sustainable forest management since most potential suitable habitats for jaguars were found outside protected areas. These results can be useful to highlight areas of potential opportunities or conflicts for jaguar conservation in a human-dominated landscape and to target areas for further jaguar surveys.Keywords: biodiversity conservation, landscape ecology, habitat modeling, corridor, connectivity, jaguar, Mexico.Les courants actuels en biologie de la conservation privilégient le maintien d'habitats essentiels autant dans les aires protégées que sur les terres adjacentes montrant une gestion durable des habitats. Ceci peut être particulièrement critique lorsque des terres doivent être aménagées afin de permettre la conservation de populations de grands carnivores tel que le jaguar, qui requiert une bonne connectivité d'habitats, permettant une minimisation des risques de conflit avec l'humain et favorisant le déplacement des populations de jaguars. Cette étude vise à produire des informations spatiales pour la gestion de populations de jaguars ainsi que l'implémentation de corridors reliant ces populations dans la péninsule du Yucatan, au Mexique, une aire d'importance internationale pour l'espèce. À l'aide de MaxEnt, on a d'abord créé un modèle général d'habitats potentiels ainsi qu'un modèle basé sur le genre (male ou femelle), en utilisant les donnés d'occurrences du jaguar et une combinaison de variables de couverture et utilisation du sol, de distance à des infrastructures (i.e., habitations et routes) et de climat (précipitation moyenne annuelle). Cette information a ensuite été utilisée afin de développer une analyse de coût de déplacement dans des corridors reliant quatre lieus (nœuds) où les observations actuelles de jaguar sont concentrées. Bien que tous les modèles aient une excellente performance, les modèles basés sur le genre (femelle AUC = 0.928±0.014, male AUC = 0.942±0.042) avaient une performance supérieure au modèle général (AUC = 0.889±0.047), et ce, malgré la plus petite taille de l'échantillon. La variable couverture et utilisation du sol était un meilleur facteur dans le modèle des femelles, mais tous les modèles ont prédit que peu d'habitats avaient un fort potentiel dans la région et que les quelques habitats potentiels étaient associés à des forêts tropicales sempervirentes. Les habitats potentiels (i.e., avec un bon potentiel ou un très bon potentiel) étaient moins nombreux, mais plus fragmentés et de plus petite taille dans le modèle des males ou le modèle général que dans le modèle de femelles. Cinq corridors potentiels de qualité variable ont été identifiés entre les nœuds de populations, le meilleur étant celui qui relie Calakmul à Sian Ka'an sur la côte Caribéenne est, suivi par celui reliant Sian Ka'an à Ria Lagartos. Le corridor reliant le site du nord de Ria Lagartos à Ria Celestun présentait le plus faible potentiel. Les modèles d'habitats potentiels et de corridors démontrent l'importance de conserver les terres productives par une gestion durable des forêts puisqu'elles regroupent des habitats favorables au jaguar, et ce, à l'extérieur d'aires protégées. Ces résultats permettent l'identification d'aires présentant un bon potentiel pour la conservation du jaguar dans un paysage dominé par l'humain ou de sélectionner des aires pour échantillonner des populations de jaguars. Mots clés: Biologie de la conservation, écologie du paysage, modélisation d'habitat, corridor, connectivité, jaguar, Mexique.
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Eastmond, Amarella. "From milpa to citrus : opportunity or risk? a study of two villages in Yucatan, Mexico." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239770.
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Navarrete, Jose Manuel. "The Maya in transition : is the maquila industry in rural Yucatan a sustainable development alternative?" Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1446289/.
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Using a case study from a rural region of southern Mexico, this work evaluates the performance of a garment assembly plant and compares the findings with the extensive literature on the assembly industry in northern Mexican cities. It assesses the economic, environmental and social impacts of a large garment assembly plant located in a depressed rural area of Yucatan, and considers the implications for semi-industrialised countries* ability to implement sustainable development policies in a liberalised global economy. A social survey of 200 people and 20 in-dcpth interviews were the main source of data. Under the New Economic Model (NEM) export assembly activities have accounted for a growing share of the economy of the New Industrialised Countries (NICs). In Mexico such companies have grown rapidly since the 1960s and have constituted the main development policy. Maquiladoras have become one of the principal sources of foreign earnings and have been the fastest growing source of employment. Less positively, maquiladoras have not succeeded in integrating with local industry nor have they reduced migration to the US or even significantly improved the living standards of those working in the sector. The garment maquiladora studied in this thesis - Monty industries, Motul, Yucatan - offers a unique perspective on the assembly activities carried out in the country. The plant is located in the south of Mexico, in a rural area of one of the poorest and more indigenous states. Although most of the negative ch-:v itics of the industry are present, the overall impact is quite positive and differs in many ways with what has been written about the industry in the north of the country. Because jobs are distributed among a relatively small number of families, Monty has had a considerable economic impact and generated many economic spillovers. However, despite state legislation aimed at reducing the impact of pollution, Monty is a polluting plant that has not complied with the Mexican environmental norms.
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Pak, Yvonne. "Evaluation of the Yucatan micropig for assessing the disposition and oral bioavailability of selected compounds." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280528.
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Disposition and oral bioavailability studies involving non-rodent animal models traditionally rely upon the dog to predict human pharmacokinetics and oral bioavailability values during the preclinical phase of drug development. However, differences in oral absorption parameters suggest that the dog, in general, may fail to reasonably predict human values. The Yucatan micropig is proposed and examined as an alternative animal model for such studies. The presence and distribution of four major cytochrome P450 (CYP) enzymes (1A2, 2C19, 2D6, and 3A4) was characterized along the small intestine of the Yucatan micropig. Distribution patterns of these enzymes were similar to humans, especially for CYP3A4. CYP1A2, 2D6, and 3A4 content were greatest in the duodenum-upper jejunum region while CYP2C19 content was relatively consistent throughout the length of the small intestine. The quantity of CYP3A4 enzymes present was substantially greater than any of the other enzymes examined. To examine the validity of using swine to predict human values, an oral bioavailability study was conducted in Yucatan micropigs using antipyrine as a model compound. Rate and extent of absorption of antipyrine in humans were better predicted using the Yucatan micropigs as an animal model than any other species (rat, monkey, dog). After establishing the utility of the Yucatan micropig for absorption studies to predict human values, the disposition and bioavailability of components in two botanicals, turmeric and ginger, were examined. Curcumin, a major active component of turmeric, was found to have a very short terminal half-life due to, in part, a high blood clearance based on data obtained from several in vitro studies. Bioavailability of curcumin varied depending on the formulation administered. Large amounts of a glucuronide metabolite were detected after oral administration of curcumin indicating substantial pre-systemic metabolism. Unlike curcumin, 6-, 8-, and 10-gingerol, major putative components of ginger, were stable in blood. Terminal half-lives were only slightly longer than that for curcumin (10.5, 6.2, and 8.8 minutes, respectively). Formation of a glucuronide metabolite for each of the gingerols was observed after oral administration of capsules containing a crude ginger extract, but absent in the commercial product administered.
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Pyburn, James. "A 2,205-year record of tropical cyclone strikes near Yucatán, Mexico, from mud layers in a stalagmite." Thesis, Boston College, 2010. http://hdl.handle.net/2345/1180.
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Thesis advisor: Amy FrappierTropical cyclones (TCs), known as hurricanes in the Atlantic and Typhoons in the Pacific, are among the most destructive and deadly natural disasters that occur on Earth. Attempts to understand how TCs relate to the global climate system, and future risk assessments are dependent upon having records of TC activity that pre-date the modern meteorological records, which are commonly not older than 130 years (Nott, 2003). Paleotempestology is a sub-discipline of paleoclimatology that attempts to extend the TC record beyond the meteorological record through the use of proxies. Presented here is the establishment of a paleotempestology proxy based on clastic mud being suspended in the water column by floods caused by TCs and deposited in stalagmite CH-1, collected in June of 2007 from Cenote Chaltun-Ha, a low-lying cave from the Yucatán Peninsula. CH-1 was dated by a combination of 210Pb, U/Th, and layer counting techniques, creating an age model for its entire length. The years with mud layers were compared to the historical TC record from 1852-2006. Nineteen mud layers were identified for this time period. All of the mud layers deposited in years with at least one TC passing within 330 km of Cenote Chaltun-Ha. A total of 265 mud layers were identified in CH-1 dating from 198 BC to 2006 AD. Relatively high TC frequency, ~16 mud layers/century, was recorded in CH-1 from 198 BC to ~1233 AD. This period was followed by eight centuries of relatively low TC frequency, ~7 mud layers/century. The low frequency period hit a low point in the 1600s with 4 mud layers. Since the 1600s the TC frequency recorded in CH-1 has been on the rise, indicating possible periods of higher than present TC frequency in the future for the Yucatán region. This trend of high TC frequency followed by a sudden drop and subsequent increase is also reported in published sand overwash deposit research. δ;18O and δ;13 values collected from CH-1 provide insight into the timing of regional droughts. A low δ;18O value from 1815 provides evidence that "The Year Without a Summer" caused by the 1815 eruption of the Tambora volcano in Indonesia had a climatic effect on the Yucatán. A land-use signal related to the agricultural production boom of Agave Fourcroydes, a succulent plant known as Henequen, in the early 20th century was also detected in δ;13C values
Thesis (MS) — Boston College, 2010
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
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Hopkins, A. L., J. R. Stepp, C. McCarty, and J. S. Gordon. "Herbal remedy knowledge acquisition and transmission among the Yucatec Maya in Tabi, Mexico: a cross-sectional study." BioMed Central, 2015. http://hdl.handle.net/10150/610317.
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BACKGROUND: Ethnobotanical knowledge continues to be important for treating illness in many rural communities, despite access to health care clinics and pharmaceuticals. However, access to health care clinics and other modern services can have an impact on the distribution of medical ethnobotanical knowledge. Many factors have been shown to be associated with distributions in this type of knowledge. The goal of the sub-analyses reported in this paper was to better understand the relationship between herbal remedy knowledge, and two such factors, age and social network position, among the Yucatec Maya in Tabi, Yucatan. METHODS: The sample consisted of 116 Yucatec Maya adults. Cultural consensus analysis was used to measure variation in herbal remedy knowledge using competence scores, which is a measure of participant agreement within a domain. Social network analysis was used to measure individual position within a network using in-degree scores, based on the number of people who asked an individual about herbal remedies. Surveys were used to capture relevant personal attributes, including age. RESULTS: Analysis revealed a significant positive correlation between age and the herbal medicine competence score for individuals 45 and under, and no relationship for individuals over 45. There was an insignificant relationship between in-degree and competence scores for individuals 50 and under and a significant positive correlation for those over 50. CONCLUSIONS: There are two possible mechanisms that could account for the differences between cohorts: 1) knowledge accumulation over time; and/or 2) the stunting of knowledge acquisition through delayed acquisition, competing treatment options, and changes in values. Primary ethnographic evidence suggests that both mechanisms may be at play in Tabi. Future studies using longitudinal or cross-site comparisons are necessary to determine the whether and how the second mechanism is influencing the different cohorts.
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Hopkins, Allison L., John Richard Stepp, Christopher McCarty, and Judith S. Gordon. "Herbal remedy knowledge acquisition and transmission among the Yucatec Maya in Tabi, Mexico: a cross-sectional study." BioMed Central, 2015. http://hdl.handle.net/10150/621265.
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UA Open Access Publishing FundBackground: Ethnobotanical knowledge continues to be important for treating illness in many rural communities, despite access to health care clinics and pharmaceuticals. However, access to health care clinics and other modern services can have an impact on the distribution of medical ethnobotanical knowledge. Many factors have been shown to be associated with distributions in this type of knowledge. The goal of the sub-analyses reported in this paper was to better understand the relationship between herbal remedy knowledge, and two such factors, age and social network position, among the Yucatec Maya in Tabi, Yucatan. Methods: The sample consisted of 116 Yucatec Maya adults. Cultural consensus analysis was used to measure variation in herbal remedy knowledge using competence scores, which is a measure of participant agreement within a domain. Social network analysis was used to measure individual position within a network using in-degree scores, based on the number of people who asked an individual about herbal remedies. Surveys were used to capture relevant personal attributes, including age. Results: Analysis revealed a significant positive correlation between age and the herbal medicine competence score for individuals 45 and under, and no relationship for individuals over 45. There was an insignificant relationship between in-degree and competence scores for individuals 50 and under and a significant positive correlation for those over 50. Conclusions: There are two possible mechanisms that could account for the differences between cohorts: 1) knowledge accumulation over time; and/or 2) the stunting of knowledge acquisition through delayed acquisition, competing treatment options, and changes in values. Primary ethnographic evidence suggests that both mechanisms may be at play in Tabi. Future studies using longitudinal or cross-site comparisons are necessary to determine the whether and how the second mechanism is influencing the different cohorts.
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Favier, de Coulomb Annelise. "Les relations entre la médecine traditionnelle et la médecine moderne dans une communauté maya du Yucatan (Mexique) à travers l'exemple de l'accouchement." Paris 3, 1994. http://www.theses.fr/1995PA030114.
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Dans une communaute maya du yucatan (mexique) appelee ichmul, nous avons etudie les choix medicaux de la population, particulierement pour l'accouchement. Nous avons choisi ce village pour la double presence d'un service de soins modernes : la clinique rurale (administree par l'imss-coplamar) et de guerisseurs trditionnels (le "h'men" celui qui sait, les accoucheuses, les herboristes). Nous nous sommes rendus compte que, malgre la possibilite de realiser leur accouchement a la clinique du village, par l'intermediaire du medecin (ou de l'infirmiere) et en presence de l'accoucheuse traditionnelle, les familles preferent accoucher chez elles, par les soins de l'accoucheuse traditionnelle. Nous nous sommes donc interroges sur les raisons de cette preference. Apres une mise en evidence du rituel de naissance, rituel fondateur de la culture, nous montrons quel est le role etla fonction des accoucheuses traditionnelles. Elles sont a l'interface de notre questionnement : les relations entre la medecine traditionnelle et la medecine moderne, puisqu'elles sont formees a des techniques modernes, a travers des sessions de formation. Cela leur permet de continuera pratiquer les accouchements dans les conditions traditionnelles, tout en acquerant des techniques nouvelles. Elles doivent travailler en collaboration avec la clinique etWE CHOOSED A COMMUNITY IN THE SOUTH OF YUCATAN (MEXICO) IN THE MAYA AREA. THE COMMUNITY IS CALLED ICHMUL. WE WANTED TO STUDY THE WAYS THE PEOPLE USE TO CURE. SO THIS COMMUNITY HAB BEEN CHOOSEN BECAUSE OF THE DOUBLE PRESENCE OF MODERN AND TRADITIONNAL MEDeCINE. WE STUDIED PARTICULARLY THE WAYS OF DELIVERING. THE TRADITIONNAL BIRTH ATENDANTS ARE FORMED TO THE NEWS TECHNIQUES THROUGH SESSION OF FORMATION THAT LASTED ONE WEEK OR FEW DAYS. THEN THEY WORK IN THEIR VILLAGE COOPERATING WITH THE DOCTOR (OR THE NURSE) THROUGH THE RURAL CLINIC CALLED"CHINICA" IN YUCATAN WHICH IS A PARTICULAR VERSION OF THE PRIMARY HELTH CENTERS. THOSE PRIMARY HEALTH CENTERS WORKS WITH THE TRADITIONNAL PATRICIANS, AND ALSO WITH THE COMUNITY THROUGH THE COMUNITY PARTICIPATION. WE WANTED TO UNDERSTAND WHY, IN SPITE OF THE PRESENCE OF THE "CLINICA" THE PEOPLE STILL DECIDE TO DELIVER AT HOME, WITH A TRADITIONNAL BIRTH ATTENDANT. THIS WORK TRIES TO SHOW THE FORMATION OF THE TRDITIONNAL BIRTH ATTENDANT HAVE AN INFLUENCE AMONG THE GROUPE, AND PARTICULARLY ON THE BIRTH RITUAL
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Bojorquez, Lopez Fernando. "Développement urbain et aménagement de la région sud-est du Mexique : le cas de l'état du Yucatan." Paris 3, 1987. http://www.theses.fr/1987PA030245.
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Après avoir analyse les origines géographiques, économiques et démographiques des centres urbains de l’état du Yucatan, notamment de merida ( capitale de cet Etat) et sa conurbation, et les caractéristiques contradictoires de la politique urbaine du gouvernement mexicain dans le contexte international, national et régional, nous constatons : que le développement de cette région est étroitement lie au développement d'un système de centres urbains économiquement intégrés, ou les villes jouent le rôle de pôles de croissance attirant industries et population, mais en reproduisant le modèle néfaste de concentration-dispersion existant au niveau national. Il semble donc nécessaire de mettre en place une éventuelle politique de restructuration du réseau urbain, projeté a long terme (an 2000), afin de décentraliser merida vers plusieurs villes sélectionnées en fonction de leur potentiel de développement et de leur zone d'influence en milieu rural, et ainsi d’établir un changement d'orientation du rôle du gouvernement en tant qu'organisme planificateurAfter having analyzed the geographical, economic and demographic origins of the urban centers of the yucatan state, more particularly of merida (chief town of this state) and its conurbation and the conflicting characteristics of the urban policy of the mexican government in the international, national and regional context : we find that the development of this area is closely linked to the development of a system of economically integrated urban centers where towns play a key role in the growth point attracting industries and populations, while reproducing the pernicious patterns of concentration-dispersion existing on the national level. Therefore it seems necessary to set an eventual policy aiming at reorganizing the structure of the long-term planned urban network (year 2000), in order to decentralize merida into several towns selected according to their developing potentialities and to their sphere of influence in rural environment, thus bringing a change of orientation in the role played by the government as a planning organism
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Barrera, Ramirez Luis Martin. "Apprentissage et développement des compétences au sein des institutions hospitalières de la province du yucatan mexique." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU2005/document.
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Ce travail de recherche a été motivé par la volonté de comprendre en profondeur le changement dans les organisations, l’importance et l’impact des compétences sur le changement dans le secteur hospitalier, en particulier dans une institution de santé du Yucatán. L’intention de l’étude est de provoquer une transformation de la situation actuelle telle que je lai expérimentée comme auteur, que l’on trouve aussi dans bien d’autres organisations, par rapport à la façon de se confronter au changement et pour comprendre comment les compétences contribuent à la réalisation des objectifs d'une organisation donnée. Ce travail essaie également de montrer comment la transformation mentionnée affecte les organisations, notamment en ce qui concerne les facteurs de résistance au changement et les situations qui sont la cause de ces transformations. L’étude montre comment s’acquièrent les compétences dans une organisation de santé (étude de cas), et montre quelles sont les compétences qui encouragent le changement et l'innovation dans un établissement de santé au Mexique. Enfin, des recommandations et suggestions sont proposées pour améliorer la performance de l'organisation (cas étudié). Pour réaliser cette recherche, une investigation-action a été réalisée (méthodologie où l’auteur est impliqué directement), à partir de techniques comme l'observation participante, la triangulation d’information et l'étude de cas. Cette recherche et ses résultats ont comme finalité de devenir un socle pour de futures recherches qui vont permettre d’établir un modèle pour le développement des compétences destinées à promouvoir le changement et l'innovation dans une organisation hospitalière (étude de cas)This investigation was motivated by the interest of understanding change processes in organizations and the way in which competencies affect the health sector, particularly a hospital in Yucatan. This work had the intention of modifying the actual situation that I have experimented as an author and that actually exist in organizations about how to better face change and how competencies contribute to the achievement of the organization goals. At the same time, this work seeks to demonstrate how change affects organizations regarding resistance to change factors and the situations that provoke change processes. We also show how competencies may be learnt in a health institution (case study) and we define the competencies that propitiate change and innovation in a concrete health institution in Yucatan. Last, recommendations and suggestions are proposed in order to improve the performance of the organization. For this research work, investigation-action was used, as well as techniques like participative observation, data triangulation and case study. This investigation work and its results should be used in future investigation works as a basis for designing a model for competencies development that promote change and innovation in a health institution (case study)
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MacSwiney, GonzaÌlez MariÌa Cristina. "Ecology and conservation of bat assemblages associated with water-filled sinkholes (cenotes) in the Yucatan Peninsula, Mexico." Thesis, University of Aberdeen, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485386.
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In the Yucatan, cenotes or water-filled sinkholes fonned by the dissolution of limestone and surrounded by a characteristic dense layer ofheterogeneous vegetation, are the main sources of water for humans and animal assemblages. I investigated the importance of cenotes and their surrounding vegetation for bats by comparing the assemblage structure and diversity between forest and pastureland, with and without cenotes. I set ground level mist nets, sub-can.6py nets and harp traps and recorded the ultrasonic calls of flying bats for 96 nights in 2003-2005. Capture and acoustic methods recorded a total of 37 species in six families. Accumulation curves demonstrated that I sampled most of the species likely to be recorded. Forest sites had a greater bat species diversity and abundance than pastureland, as well as more rare and threatened species. Forest sites with and without cenotes had a similar bat assemblage structure and diversity, whereas in pastureland there was a greater species diversity and abundance and number of rare and threatened species at cenotes than at sites without cenotes. Cenotes in the pastureland landscape attracted an abundance of frugivores which fed on 27 plant species from 13 families. In addition, the highest number of passes and feeding buzzes of insectivorous bats was recorded at cenotes in pastureland. One species, Pteronotus personatus, represented a new record for the Yucatan bat fauna. Chrotopterus auritus and Micronycteris schmidtorum, both of which are listed by the Mexican government as threatened species, together with Eptesicus furinalis, Eumops underwoodi and P. personatus, were recorded only at cenotes. In Yucatan's agricultural landscapes, protection of cenotes and their characteristic vegetation is, essential not only for the conservation of bat diversity but also because they represent potential seed sources for the regeneration of the lowland forest, in which bats play key roles as pollinators and seed dispersers. Key words: Chiroptera, deforestation, echolocation, forest, frugivorous bats, insectivorous bats, habitat use, pastureland, pollination, seed dispersal, water resources.
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Gonthier, Karine. "Mouvement paysan maya de 1847 au Yucatan : regard historiographique sur les origines de la guerre des castes." Master's thesis, Université Laval, 2001. http://hdl.handle.net/20.500.11794/28574.
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