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Dissertations / Theses on the topic 'Fragmented population'

Author: Grafiati

Published: 7 September 2021

Last updated: 21 June 2025

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1

Mäki-Petäys, H. (Hannaleena). "Conservation and management of populations in a fragmented forest landscape:behavioural ecology meets population genetics." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514283482.

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Abstract The effects of habitat loss and fragmentation on the genetic structure and vulnerability of populations strongly depend on the behaviour of a particular species. In this thesis, I examined the effects of forest fragmentation on genetic population structure with the aim of identifying and evaluating the different genetic and behavioural factors important for species conservation and management on different geographical scales. The species studied were the mound building red wood ants Formica lugubris and F. aquilonia, and a lekking bird, the capercaillie, Tetrao urogallus. Habitat lo

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2

Cullen, Sean Anthony. "Population biology of eared grebes in naturally fragmented habitat." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq37507.pdf.

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3

Timm, Anne Louise. "Brook Trout Population Genetic Tools for Natural Barriers in Fragmented Subwatersheds." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77044.

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Barriers to fish movement can cause aquatic habitat fragmentation by reducing the amount of available habitat. The primary goal of my research was to investigate applications of population genetic analysis tools as indicators of barrier effects on brook trout populations in fragmented subwatersheds. In chapter1, I tested the hypothesis that brook trout population genetic differentiation (FST) above and below barriers will differ in relation to barrier height and gradient. I also tested the hypothesis that average gene diversity per locus (H) and the numbers of alleles (A) differed between samp

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4

Todd, Rebecca. "The population genetics of red squirrels in a fragmented habitat." Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/11600/.

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The genetics of eight small red squirrel (Sciurus vulgaris L. ) populations in northern Belgium is investigated by analysing variation in a section of the mitochondrial control region and five microsatellite loci. The full sequence of the mitochondrial control region in red squirrels is determined and is compared to that of other mammals. The isolation of microsatellite loci is also described. The eight fragment populations are compared with two large Belgian populations and one large population in the Bavarian Forest, Germany. Virtually no variation is found in the control region within any o

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5

Becker, Ute. "Population biology of Carlina vulgaris and Hypochoeris radicata in fragmented European grasslands." [S.l. : s.n.], 2005. http://archiv.ub.uni-marburg.de/diss/z2005/0122/.

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6

White, Gemma Michelle. "A study of population genetics of Swietenia humilis zucc. in fragmented forest." Thesis, University of Dundee, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481539.

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7

Small, Emma Clare. "The biodiversity and population of carbid beetles (coleoptera, carabidae) in fragmented urban habitats." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289261.

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8

Paterson, Victoria Louise. "Population dynamics of rodents and their parasite communities in a naturally fragmented landscape." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/4028/.

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An island system with corresponding mainland sites, was used to study woodland rodent dynamics and their parasite communities within a naturally fragmented landscape. The study site, hosts and parasite species investigated within this thesis allowed the investigation of how natural fragmentation affects demographic and population dynamics of rodents (chapter 3). Reduced habitat connectivity is known to affect nearly every process in biology. Low degrees of fragmentation and high connectivity between habitats have been shown to provide the most stable conditions for populations to persist, as m

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9

McNeil, Shannon Elizabeth. "Population Genetic Diversity and Structure in Yellow-billed Cuckoos across a Fragmented Landscape." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/595973.

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Riparian ecosystems are disproportionately biodiverse and vital to many taxa despite their scant footprint on the landscape. Yet globally they are also under the greatest human-caused threats. The loss of habitat is the greatest driver of species declines, but fragmentation may also significantly impact populations by creating barriers to dispersal. Effective conservation requires an informed understanding of species' threats and capabilities, though it is unclear whether the increasing fragmentation of riparian woodland in western North America is affecting dispersal patterns of riparian bree

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10

Castro, Mário Rui da Costa Basílio e. "Juniperus navicularis Gand - contributos para a sua conservação." Master's thesis, Universidade de Évora, 2009. http://hdl.handle.net/10174/20793.

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Juniperus navicularis Gand. (piorro) é uma conífera endémica portuguesa que constitui frequentemente sub-bosque dos pinhais nas areias de transição de pliocénicas para plistocénicas da região litoral a -sul do Tejo. O objectivo deste trabalho é verificar as localizações documentadas em herbário para esta espécie, avaliando o estado de conservação através do estudo da8 populações, assim como estabelecer um protocolo laboratorial para a multiplicação in vitro. Das 12 populações identificadas, amostraram-se 4 com distintas características em termos de conservação. Medições espaciais e morfológica

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Ramos, Alexandre Stefano Sousa. "Early post-fledgling survival in a fragmented population of a tropical cooperative breeding passerine." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15930.

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Mestrado em Ecologia Aplicada<br>During the last years tropical forest has been a target of intense study especially due to its recent big scale destruction. Although a lot still needs to be explored, we start realizing how negative can the impact of our actions be for the ecosystem. Subsequently, the living community have been developing strategies to overcome this problem avoiding bottlenecks or even extinctions. Cooperative breeding (CB) has been recently pointed out as one of those strategies. CB is a breeding system where more than two individuals raise one brood. In most of the cases

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12

Sumner, Joanna Mary. "The ecology and population genetics of the prickly forest skink in a fragmented habitat /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16515.pdf.

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13

Daniel, Gregory. "Interaction between dispersal and behavioural syndromes - empirical approach in a fragmented population of passerine birds." Doctoral thesis, Uppsala universitet, Institutionen för ekologi och genetik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-267431.

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Dispersal is a key life history trait for ecological and evolutionary processes in wild populations. The latest research has particularly focused on the correlation between behavioural traits and dispersal, in order to emphasize the existence of behavioural syndromes of dispersal, and on the estimation of the genetic basis of the dispersal behaviour. Dispersing individuals are not a random part of the population, but are individuals showing particular strategies, that help them to succeed in their dispersal attempt. This thesis has three main aims of research. The first is to show a genetic ba

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14

Rowston, Coral. "The Squirrel Glider: An Autoecological Study in a Fragmented Landscape." Thesis, Griffith University, 1998. http://hdl.handle.net/10072/367564.

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The primary aim of this study was to investigate the ecology of the squirrel glider in a region where the potential habitat of the species exists in fragmented landscape. Aspects of the population ecology of the glider within the south east Queensland region were studied through a trapping program spanning 27 sites, each site representing a particular size category of bushland remnant, and located in a specific altitude category. Four size classes of bushland remnant: 10-20 ha, 50-120 ha, 200-1000 ha, and >2000 ha; and three altitude categories: 0-60 m, 80-300 m and >300 m; were chosen. The ha

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Alderman, Jolyon. "Conservation by simulation : an individual-based spatially explicit model to simulate population dynamics in fragmented habitat." Thesis, University of Northampton, 2005. http://nectar.northampton.ac.uk/2984/.

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This thesis describes PatchMapper, a model combining a population simulator based on individual behaviour, with a spatially explicit representation of a landscape. To investigate the robustness of the technique, representatives of three major taxa were modelled: the nuthatch (Sitta europaea L.), the white-footed mouse (Peromyscus leucopus Rafinesque) and the black hairstreak (Satyrium pruni L.). For the nuthatch and white-footed mouse, the performance of PatchMapper was compared with published models of the same species, but using different approaches, including, for the nuthatch, a comparison

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Sutherland, Christopher. "A quantitative investigation of metapopulation dynamics in a naturally fragmented population of water voles Arvicola amphibius." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=198348.

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17

Pernetta, Angelo P. "Population ecology and conservation genetics of the smooth snake (Coronella austriaca) in a fragmented heath landscape." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72641/.

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Coronella austriaca is the United Kingdom’s rarest snake, being confined to the lowland heathlands of Dorset, Hampshire and Surrey. As a result, it remains the least understood; despite being listed as a key biodiversity action plan species. Substantial loss and fragmentation of its primary UK habitat - lowland heathland - has occurred in recent times, and yet research examining the population ecology and conservation genetics of this species remains limited. As a result, this PhD research was developed to fill this need. Based on three years of data collection, a combination of field studies,

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18

Hagood, Susan. "Genetic differentiation of selected Eastern box turtle (Terrapene carolina) populations in fragmented habitats, and a comparison of road-based mortality rates to population size." College Park, Md. : University of Maryland, 2009. http://hdl.handle.net/1903/9995.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Davis, Robert A. "Metapopulation structure of the Western Spotted Frog (Heleioporus albopunctatus) in the fragmented landscape of the Western Australian wheatbelt." University of Western Australia. School of Animal Biology, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0026.

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[Truncated abstract] Amidst concern over the global phenomenon of declining amphibians, there is an increasing appreciation of the importance of understanding population dynamics at both local and regional scales. Data on the viability and persistence of species in landscapes altered by humans are scarce but an understanding of these dynamics is essential for enabling long-term species conservation in a modified world. Habitat loss, fragmentation and ensuing salinisation are of particular concern for species in Australia’s temperate agricultural regions where the rapid conversion of continuous

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20

Shafer, Bambi. "AN ASSESSMENT OF WHITE-TAILED DEER (ODOCOILEUS VIRGINIANUS) DYNAMICS, MANAGEMENT, AND IMPACTS IN HIGHLY FRAGMENTED LANDSCAPES." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1292874594.

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21

Buk, Tara B. "Gene Flow Patterns of the Five Lined Skink (Eumeces Fasciatus) in the Fragmented Landscape of Northeast Ohio." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399675200.

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22

Terho, H. (Henri). "Electrocardiographic risk markers for cardiac events in middle-aged population." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526223841.

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Abstract Cardiovascular diseases are the leading cause of death in developed countries. Approximately 50% of these events are due to sudden cardiac death (SCD) and often without preceding diagnosis of cardiac disease. Many risk factors for cardiac events have been identified and prevention strategies have improved markedly. The aim of this thesis was to evaluate the usability of the 12-lead electrocardiogram (ECG) to predict cardiac events. The study population consisted of 10,904 middle-aged general population subjects with ECG recordings between the years 1966–1972 with a long follow-up (30&

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Tambarussi, Evandro Vagner. "Contemporary gene flow, mating system, and spatial genetic structure in a Jequitibá-rosa (Cariniana legalis Mart. Kuntze) fragmented population by microsatellite markers." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-24032014-101908/.

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Cariniana legalis Mart. O. Kuntze (Lecidiaceae) is the largest tree of the Atlantic Forest. To contribute to in situ and ex situ genetic conservation programs for the species, herein we investigate the genetic diversity, inbreeding, intrapopulation spatial genetic structure (SGS), mating system and contemporary pollen flow in three fragmented populations of this species. We found 65 adult trees in the Ibicatu population, 22 in MGI, and four in MGII. Seeds were hierarchically sampled among and within fruits directly from the canopy of 15 seed-trees in Ibicatu (n= 40), five seed-trees in MGI (n=

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Souza, Francine Beatriz de. "Historic pollen and seed dispersal in fragmented populations of Cariniana estrellensis (Raddi) Kuntze and Cariniana legalis (Mart.) Kuntze." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153203.

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Submitted by FRANCINE BEATRIZ DE SOUZA null (francinnysouza@yahoo.com.br) on 2018-03-25T19:33:25Z No. of bitstreams: 1 Francine__Tese_VersãoFinal_2018.pdf: 1284636 bytes, checksum: 8130187eea228723fe2e75938a47a468 (MD5)<br>Approved for entry into archive by Cristina Alexandra de Godoy null (cristina@adm.feis.unesp.br) on 2018-03-26T12:25:02Z (GMT) No. of bitstreams: 1 souza_fb_dr_ilha.pdf: 1284636 bytes, checksum: 8130187eea228723fe2e75938a47a468 (MD5)<br>Made available in DSpace on 2018-03-26T12:25:03Z (GMT). No. of bitstreams: 1 souza_fb_dr_ilha.pdf: 1284636 bytes, checksum: 8130187eea22

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Rhoads, Elizabeth A. "Landscape Genetics of the Small-mouthed Salamander (Ambystoma texanum) in a Fragmented Habitat: Impacts of Landscape Change on Breeding Populations in Hardin County, Ohio Forests." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1304343825.

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26

Angel, Antonia Sara. "Landscape genetics and the effects of climate change on the population viability of declining avifauna in fragmented eucalypt woodlands of the West Australian wheatbelt." Thesis, Angel, Antonia Sara (2015) Landscape genetics and the effects of climate change on the population viability of declining avifauna in fragmented eucalypt woodlands of the West Australian wheatbelt. PhD thesis, Murdoch University, 2015. https://researchrepository.murdoch.edu.au/id/eprint/26420/.

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The Rufous Treecreeper (Climacteris rufa), Yellow-plumed honeyeater (Lichenostomus ornatus) and the Western Yellow Robin (Eopsaltria griseogularis) are focal species and were investigated to assess the impacts of climate change and severe habitat fragmentation on the genetics and viability of remaining populations. This study was located within the west Australian wheatbelt where 93% of the native vegetation, including 97% of the York gum, wandoo and salmon gum woodlands have been cleared for agriculture (Saunders, et al., 1989) and where climate modelling predicts hotter and dryer weather con

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Stasek, David Jon. "BUTTERFLY MOVEMENTS AMONG ISOLATED PRAIRIE PATCHES: HABITAT EDGE, ISOLATION, AND FOREST-MATRIX EFFECTS." Oxford, Ohio : Miami University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1150217598.

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Kubota, Thaisa Yuriko Kuboyama [UNESP]. "Study of flow and contemporary pollen dispersal, mating system, spatial distribution of genotypes and inbreeding depression in fragmented population Cariniana estrellensis (Raddi) Kuntze, using microsatellite loci." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150019.

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Submitted by Thaisa Yuriko Kuboyama Kubota null (thaisayuriko@yahoo.com.br) on 2017-03-28T17:23:06Z No. of bitstreams: 1 Thaisa Yuriko Kuboyama Kubota final.pdf: 3306542 bytes, checksum: 181c1290e3cfe55497289015bf4453c0 (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-03-29T20:58:34Z (GMT) No. of bitstreams: 1 kubota_tyk_dr_ilha.pdf: 3306542 bytes, checksum: 181c1290e3cfe55497289015bf4453c0 (MD5)<br>Made available in DSpace on 2017-03-29T20:58:34Z (GMT). No. of bitstreams: 1 kubota_tyk_dr_ilha.pdf: 3306542 bytes, checksum: 181c1290e3cfe55497289015bf4

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Kubota, Thaisa Yuriko Kuboyama. "Study of flow and contemporary pollen dispersal, mating system, spatial distribution of genotypes and inbreeding depression in fragmented population Cariniana estrellensis (Raddi) Kuntze, using microsatellite loci /." Ilha Solteira, 2017. http://hdl.handle.net/11449/150019.

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Orientador: Alexandre Magno Sebbenn<br>Resumo: Cariniana estrellensis (Raddi) Kuntze (Lecythidaceae), popularmente conhecida como jequitibá-branco, é uma espécie arbórea tropical típica de estágios sucessionais avançados, característica de florestas clímax. Apesar da sua importância ecológica, a espécie encontra-se ameaçada de extinção, principalmente devido à intensa exploração e degradação de seu ambiente natural. O objetivo deste trabalho foi investigar a diversidade genética, a estrutura genética espacial intrapopulacional (EGE), o sistema de cruzamento e o fluxo gênico contemporâneo de um

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30

Yoshida, Ahlin Celia. "Rural demographic change over space and time - the case of Vilhelmina municipality." Thesis, Umeå universitet, Kulturgeografi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105391.

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Since the 1960s the literature on demography of rural northern Sweden has focussed on 'decline' - noting loss of population, population ageing, yourth outmigration and other 'negative' demographic developments (Friedlander, 1969; Hjort, 2009; Stone 1971); recent studies suggest that such generalizations may overlook the diversity of experiences of rural areas (D. Carson and Koch, 2013; Cernic-Maly, Koch and Koch, 2014; Hedlund, 2014; Hoggart and Paniagua, 2001; Koch and Carson, 2012). The purpose of this thesis is to explore aspets of the diversity of experiences of demographic change in one p

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31

Chanyenga, Tembo Faera. "Effect of population size on viable seed output, seed rand and natural regeneration pattern of a tropical conifer Widdringtonia whytei-Rendle in Malawi." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85589.

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Thesis (PhD(For))--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Widdringtonia whytei is a tropical endemic, fire-adapted pioneer coniferous tree species within natural fire-fragmented Afromontane forest patches in a confined area on Mulanje Mountain in Malawi. Natural and anthropogenic fires within the surrounding fire-prone landscape, insect attacks, and uncontrolled harvesting of mature trees for timber threaten the survival of W. whytei. This study investigated the effects of population fragmentation on the reproductive biology of W. whytei, through four specific studies: effec

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Anderson, Christine Schandorsky. "Effects of Forest Fragmentation on the Abundance, Distribution, and Population Genetic Structure of White-Footed Mice (Peromyscus Leucopus)." Connect to this document online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1091657485.

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Thesis (Ph. D.)--Miami University, Dept. of Zoology, 2004.<br>Title from second page of PDF document. Document formatted into pages; contains [3], iii, 138 p. : ill. Includes bibliographical references (p.121-138).

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Luijten, Sheila Helen. "Reproduction and genetics of fragmented plant populations." Amsterdam : Amsterdam : Instituut voor Biodiversiteit en Ecosysteemdynamica (IBED) ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/60623.

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Theodorou, Konstantinos. "Processus génétiques au sein de petites populations et de populations fragmentées : implications pour la biologie de la conservation." Paris 6, 2002. http://www.theses.fr/2002PA066550.

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35

Nowakowski, Aaron J. "Connectivity of fragmented amphibian populations in a Neotropical landscape." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1515.

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A high proportion of amphibian species are threatened with extinction globally, and habitat loss and degradation are the most frequently implicated causes. Rapid deforestation for the establishment of agricultural production is a primary driver of habitat loss in tropical zones where amphibian diversity is highest. Land-cover change affects native assemblages, in part, through the reduction of habitat area and the reduction of movement among remnant populations. Decreased gene flow contributes to loss of genetic diversity, which limits the ability of local populations to respond to further env

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Tedesco, Edoardo. "Dispersal in highly fragmented water vole (Arvicola terrestris) populations." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=130842.

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The water vole (<i>Arvicola terrestris</i>) is a microtine that occurs naturally in highly fragmented populations, which persist as metapopulations. Here, I investigate two metapopulations consisting of 183 habitat patches in two areas. The aim of this thesis is to investigate the factors that determine the dispersal decisions of individuals. Specifically, I examined 1) the ecological characteristics of the natal patch that underlie the emigration decision of an individual, 2) the characteristics of intermediate patches encountered during dispersal that affect dispersal distance; 3) differen

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Wilcock, Helen Rachel. "Geographic and genetic structure of highly fragmented freshwater insect populations." Thesis, Queen Mary, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481520.

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Medici, Emilia Patricia. "Assessing the viability of lowland tapir populations in a fragmented landscape." Thesis, University of Kent, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516215.

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Schneider, Amy Elizabeth. "Continued study of the use of created ponds for amphibian breeding in fragmented forested areas." [Huntington, WV : Marshall University Libraries], 2008. http://www.marshall.edu/etd/descript.asp?ref=876.

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Will, Lindsey Noel. "Genetic variability between populations of the critically endangered frog Microbatrachella capensis, Boulenger 1910 (Anura: Ranidae: Cacosterninae)." Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/26855.

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The micro frog, Microbatrachella capensis (Boulenger, 1910), is a Critically Endangered anuran found in fragmented marshland habitats along the southern coast of the Western Cape Province of South Africa. The genetic diversity between and within the remaining populations (Kenilworth, Grootwitvlei, Kleinmond, Lamloch, Hagelkraal, and Buffeljacht/Ratelrivier) of Microbatrachella capensis in the Western Cape Province of South Africa was assessed, sampling 12 specimens from each population. Genetic diversity was determined from an analysis of mitochondrial DNA sequences obtained from the ND2 gene

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Githiru, Mwangi. "Endemic forest birds of the Taita Hills : using a model species to understand the effects of habitat fragmentation on small populations." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:b532599f-8f75-4a11-95d5-61a5afee1fca.

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Despite intense publicity, habitat loss still remains a serious threat to biodiversity. Forest destruction is its frontrunner, both in terms of physical habitat under threat and potential for biodiversity loss. In the fragmented landscape of the Taita Hills, SE Kenya, several bird species are facing the threat of extinction from forest loss. They are absent from many of the remnant forest patches and/or are showing negative effects with increasing disturbance. Using a relatively common forest-dependent bird species - the whitestarred robin Pogonocichla stellata - as a model, the current status

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Guyot, Virginie. "Rôle de la diversité des arbres dans la régulation des populations d’insectes défoliateurs en forêts matures d’Europe." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14458/1/guyot_partie_1_sur_2_2.pdf.

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Qui du phénomène de résistance (RA) ou de susceptibilité (SA) par association est prépondérant en milieu forestier ? En d’autres termes, la défoliation par les insectes herbivores est-elle moins (RA) ou plus (SA) importante sur des arbres hôtes situés en mélange comparés à des monocultures ? A cause des contraintes méthodologiques, les connaissances sur la relation diversité - résistance en forêts matures restent faibles. Pour répondre à cette question, nous avons utilisé le dispositif exploratoire du projet FunDivEUROPE. Sur un réseau de 209 parcelles forestières sélectionnées le long de deux

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Llorens, Tanya M. "Conservation genetics and ecology of two rare grevillea species." Department of Biological Sciences - Faculty of Science, 2004. http://ro.uow.edu.au/theses/374.

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Small and isolated plant populations have a higher probability of extinction – they are more susceptible to a range of environmental, demographic and genetic processes that may reduce population viability. In recent times, the number of populations and species that are susceptible to these processes has increased as a result of world-wide, human-induced habitat fragmentation. Habitat fragmentation typically reduces the formerly more continuous natural distribution of a species to a series of smaller and more isolated populations that occur in smaller and more isolated habitat patches. Such pop

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Arlinghaus, Kel R. "GENE FLOW IN NATURAL POPULATIONS OF CARICA PAPAYA IN THE FRAGMENTED LANDSCAPES OF COSTA RICA AND NICARAGUA." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470400678.

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Gontijo, Jessica Cancelli Faria. "Uso e características dos fragmentos florestais urbanos da cidade de Manaus/AM." Universidade Federal do Amazonas, 2008. http://tede.ufam.edu.br/handle/tede/2621.

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Made available in DSpace on 2015-04-11T13:54:58Z (GMT). No. of bitstreams: 1 Dissertacao-Jessica Cancelli Faria Gontijo.pdf: 4333552 bytes, checksum: aef31ee34a16b2d8e5c2b996c24f597a (MD5) Previous issue date: 2008-08-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The main goal of this study is to relate FFUs spatial distribution and area with the characteristics as of avocation from the city. 56 FFU were identified ranging in size between three and 578.6 hectares. Regarding the property regime 26 FFU were private and 30 were public land. Preliminary results on the st

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Peyret, Guzzon Marine. "Etudes moléculaires de la diversité des communautés et populations de champignons mycorhiziens à arbuscules (Glomeromycota)." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS065/document.

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La symbiose mycorhizienne à arbuscules, dont l’apparition est conjointe à celle des plantes terrestres il y a 460 millions d’années, est une association mutualiste à bénéfices réciproques qui s’instaure entre la plupart des plantes terrestres, y compris celles cultivées, et des microorganismes ubiquitaires du sol que sont les champignons mycorhiziens à arbuscules (CMA, phylum des Glomeromycota). Lors cette symbiose, le fort potentiel d’amélioration de la nutrition minérale des plantes, et donc de la production végétale, est un atout dans le contexte mondial actuel d’augmentation de la demande

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Brazeau, Christian. "In healing the ills of fragmented populations: meaningful level of connectivity that affects community composition within intertidal mussel beds." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66801.

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The effect of habitat connectivity on ecological communities within open marine ecosystems in subarctic regions has received little empirical support, partly due to a preconceived idea that connectivity cannot be assessed in such a system. This connectivity is largely under investigated due to experimental difficulties principally driven by seasonal disturbances, local and regional hydrological processes, and regional enrichment in species. Here, the interactive effect of isolation and habitat type on associated communities was investigated. We manipulated the isolation betwe

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Perret, Nadège. "Dynamique de population en habitat fragmenté chez deux espèces d'amphibiens urodèles (Triturus alpestris et T cristatus)." Lyon 1, 2000. http://www.theses.fr/2000LYO10283.

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La dispersion est un processus clé en écologie en raison de ses implications multiples tant au niveau de la dynamique des populations fragmentées, des variations des stratégies d'occupations de l'espace que de la viabilité des populations. Nous avons cherché dans ce travail à mettre en évidence les modalités de dispersion chez deux espèces d'amphibiens urogèles : les tritons alpestres et les tritons crêtés (espèce patrimoniale). Ces deux espèces, par leur mode de reproduction qui généère une agrégation des adultes dans des mares, représentent typiquement le schéma structurel d'espèces se repro

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Vasconcelos, Giuliana Mara Patrício. "Diversidade genética de Myrciaria floribunda (West ex Willdenow) Berg (Cambuí) em paisagem fragmentada da Serra da Mantiqueira, MG." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-01082002-170334/.

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Este trabalho diz respeito à diversidade genética de Myrciaria floribunda (West ex Willdenow) Berg (cambuí), uma espécie arbórea de sub-bosque, em paisagem fragmentada da Serra da Mantiqueira, MG. A diversidade genética foi estudada a partir dos dados de análises eletroforéticas de isoenzimas. Foram coletadas folhas de indivíduos jovens em duas populações dentro de um fragmento controle (5810,27 ha) e em dois fragmentos menores (18 e 10 ha), sendo quarenta plantas por fragmento. Através da análise de sete locos isoenzimáticos foi avaliada o número médio de alelos por loco (Â), número médio de

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Bled, Florent. "Tests d'hypothèses en dynamique des populations fragmentées : développement et applications de modèles d'occupation des sites." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1087/.

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Les approches classiques de modèles spatiaux pour les processus binaires de distribution d'espèces (i. E. Occupation des sites) présentent trois importantes carences. I) Elles ne prennent pas explicitement en compte l'incertitude dans le processus d'échantillonnage. Ii) Il y a un manque de modèles spatio-temporels, notamment hiérarchique. Iii) La plupart des modèles existants sont de type phénoménologique et ne considèrent pas explicitement les mécanismes écologiques sous-jacents. Cette thèse répond à ces limitations en présentant des modèles spatio-temporels d'occupation des sites pour des pr

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