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Dissertations / Theses on the topic 'Environmental niche'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Milne, Margaret Georgina. "Environmental niche evolution and ancestral niche reconstruction." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709832.

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Quantifying the diversity and distribution of the world’s biota in both space and time is a fundamental goal of modern biology, however ecologists also face the added pressure of understanding how species may respond to anthropogenically driven environmental changes. The relationship between species distributions and the environment can be captured in Environmental Niche Models (ENM’s), which create mathematical models linking species occurrences to ecological factors at a specific point in time. Whilst this approach is very useful, it can be improved by the incorporation of phylogenetic data

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2

Russell, Vanessa. "Identifying Environmental Factors Driving Differences in Climatic Niche Overlap in Peromyscus Mice." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1565722438217428.

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3

O'Rourke, Eamonn Christopher. "Natural building in South Africa : assessing the niche-regime relationship through a 'latent niche' mediation." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96704.

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Thesis (MPhil)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: In this thesis I examine the natural building movement in South Africa in an attempt to determine the systemic influences that appear to confine it to a small market operating at the very edge of the mainstream building sector. I make use of the conceptual framework of the multi-level perspective to explore the interrelationships between natural building as a technological niche and the mainstream building sector as the dominant regime. I extend the concept of a technological niche by appending the term 'latent' to form

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4

Purcell, Ceara K. Q. "How do Ecological Niches Evolve during Late Ordovician Environmental Change? A Test using Laurentian Brachiopods." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1616426713257168.

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5

Bublys, Kasparas. "Diet variability in Eurasian perch (Perca fluviatilis) as a response to environmental variables along a latitudinal gradient." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-365794.

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Climate change is expected to have a profound impact on freshwater fish communities, especially at higher latitudes. In this study I investigated potential effects of climate change on the niche structure of Eurasian perch (Perca fluviatilis) by looking at their diet across a latitudinal gradient and at varying light climate. Dietary niche width of Eurasian perch did not differ significantly between boreal and temperate latitudes. Additionally, no significant difference in the prevalence of specialist individuals was found along the latitudinal gradient and water transparency levels. Habitat w

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6

Brame, Hannah-Maria R. "Are Cincinnatian (Late Ordovician) Niche Stability Responses to Variable Environmental Changes Congruent Across Clades, Taxonomic Scales, and Through Time?" Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1366634147.

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7

Wilson, C. Elizabeth. "The environmental niche of Aboriginal infants, possible implications for sudden infant death syndrome." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ35048.pdf.

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8

Benmimoun, Billel. "Le contrôle micro-environmental de l'homéostasie du système sanguin de la larve de drosophile." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/3439/.

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L'homéostasie du système sanguin est préservée grâce à une régulation très fine de la balance entre le maintien et la différenciation des cellules souches hématopoïétiques et de leurs descendances. Cet équilibre est régulé par une relation complexe de signaux intrinsèques (cellulaires autonomes) issus de la cellule elle-même et de signaux extrinsèques (cellulaires non-autonomes) issus des cellules voisines (microenvironnement) et de l'environnement (tels que les conditions nutritionnelles ou la présence de pathogènes). La dérégulation de l'équilibre du système hématopoïétique est à l'origine d

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9

Plourde, Laura. "Environmental niche partitioning among riparian sedges (Carex, Cyperaceae) in the St. Lawrence Valley, Quebec." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112344.

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To understand maintenance of the within-habitat diversity of closely related species, I investigated 11 Carex species growing along rivers in the south-western St. Lawrence Valley of Quebec. Microenvironments within a half meter of focal plants characterized for Carex comosa, C. crinita, C. grayi, C. intumescens, C. lacustris, C. lupulina, C. pseudocyperus, C. retrorsa, C. tuckermanii, C. typhina, and C. vesicaria revealed significant differences among the species in their environmental affinities. Species appear to fall into groups based on their tolerance of flooding and are secondarily diff

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10

Strauss, Lizl. "Change management in the information age : a case study of a niche publication." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/20887.

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Thesis (MPhil)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: This is a study of media management in the publication industry under conditions of rapid environmental change. The study focuses on a particular case, The Mannequin, a niche publication serving many purposes. The study finds that environmental change creates major challenges for commercial survival. Explicit change management procedures are required. The study recommends a set of change management procedures suitable for small, niche market publications. It then recommends avenues for further research.<br>AFRIKAANSE OPS

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11

Georgian, Sam Ellis. "ENVIRONMENTAL AND ENERGETIC CONSTRAINTS ON COLD-WATER CORALS." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/382890.

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Biology<br>Ph.D.<br>Cold-water corals act as critical foundation species in the deep sea by creating extensive three-dimensional habitat structures that support biodiversity hotspots. There is currently a paucity of data concerning the environmental requirements and physiology of cold-water corals, severely limiting our ability to predict how resilient they will be to future environmental change. Cold-water corals are expected to be particularly vulnerable to the effects of ocean acidification, the reduction in seawater pH and associated changes to the carbonate system caused by anthropogenic

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12

Roark, Selena S. "Ecological Niche Modeling of the North American Giant Salamander: Predicting Current and Future Potential Distributions and Examining Environmental Influences." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3072.

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North American Giant Salamanders (Cryptobranchus alleganiensis), commonly known as hellbenders, have been experiencing a population decline for decades due to human influences, such as pollution and habitat destruction. Many efforts are underway to save the hellbender but their entire potential geographical range has not been well-studied. Currently, hellbender populations are delineated by county boundaries and are on the International Union for Conservation of Nature Red List. The Genetic Algorithm for Rule-set Production, an Ecological Niche Model, was used to model the current hellbender p

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13

Priddis, Edmund R. "Niche Separation Along Environmental Gradients as a Mechanism to Promote the Coexistence of Native and Invasive Species." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2199.pdf.

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14

Breitschwerdt, Eva [Verfasser]. "Using enrichment planting to test for environmental filtering and niche differentiation in grassland communities / Eva Breitschwerdt." Halle, 2019. http://d-nb.info/1180387856/34.

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15

VAZ-SILVA, Wilian. "Conservação de espécies em áreas de monocultura de soja no sudoeste goiano: uma avaliação usando larvas de anfíbios anuros." Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/345.

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Made available in DSpace on 2014-07-29T12:05:40Z (GMT). No. of bitstreams: 1 TESE_WILIAN VAZ SILVA.pdf: 3053873 bytes, checksum: 544be40540fb4c43966ae3333c857425 (MD5) Previous issue date: 2009-11-06<br>The basic knowledge of the answer of the species to the anthropic and natural perturbations on environments is the first step in the development of management strategies to the conservation biology. This study analyzes the pattern of occurrence of anurans species in relation of habitat, considering two different landscape uses from Jataí municipality, southwestern Goiás State, Central Brazil.

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16

Bledsoe, April, Danika Mosher, Mitchell Ogden, Monica Ayala, T. Andrew Joyner Joyner, and Ingrid Luffman. "Ecological Niche Modeling and Sustainable Agroforestry: Climate Change Mitigation for Guatemalan Coffee." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/64.

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Coffea arabica is a species with far-reaching impacts on the global economy. Nevertheless, climate-related challenges threaten the coffee industry at its source: its growing regions. The coffee industry is a significant economic driver in Guatemala, but farmers are increasingly reporting losses in crop yield and arable land due to climate-related challenges. Ecological niche modeling (ENM) can be employed to make predictions about the current and future suitability of regions for a species by identifying significant biotic or abiotic indicators. An ENM was used to project suitable land into th

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Bledsoe, April, Danika Mosher, Mitchell Ogden, Monica Ayala, Timothy Andrew Joyner, and Ingrid Luffman. "Ecological Niche Modeling and Sustainable Agroforestry: Climate Change Mitigation for Guatemalan Coffee." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/70.

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Coffea arabica is a species with far-reaching impacts on the global economy. Nevertheless, climate-related challenges threaten the coffee industry at its source: its growing regions. The coffee industry is a significant economic driver in Guatemala, but farmers are increasingly reporting losses in crop yield and arable land due to climate-related challenges. Ecological niche modeling (ENM) can be employed to make predictions about the current and future suitability of regions for a species by identifying significant biotic or abiotic indicators. An ENM was used to project suitable land into th

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18

JAMWAL, Pushpinder Singh. "Niche modelling, current distribution and future scenarios for the otters in Himalayas." Doctoral thesis, Università degli studi del Molise, 2021. http://hdl.handle.net/11695/109967.

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Otters (Family Mustelidae; Subfamily Lutrinae) are considered bioindicators of the wetlands they live in. Because they are engaged in a variety of ecosystem processes, any disruption to these ecosystems, such as hunting or climate change, is first reflected in the otter populations in the area. For species conservation and management, a basic knowledge of species ecology is required. Feeding and habitat ecology are critical for species survival because they allow for informed decisions regarding the protection and management of a species' preferred habitats. Additionally, the Himalayan mou

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19

Troia, Matthew John. "A mechanistic framework for understanding prairie stream fish distributions." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17285.

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Doctor of Philosophy<br>Department of Biology<br>Keith B. Gido<br>A fundamental goal of ecology is to understand environmental associations of species. These associations can provide a basis for predicting spatial distributions in contemporary habitats as well as how those distributions might change in response to anthropogenic environmental change. Developing species distribution models is limited by an incomplete understanding of functional traits, spatial scaling, and the mechanisms and generalities of correlations among abundance and environmental gradients. I address these four issues usi

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20

Obenauer, Julie, Megan Quinn, Ying Li, and Andrew Joyner. "Including Human Population Characteristics in Ecological Niche Models for Aedes aegypti when Modeling Projected Disease Risk due to Climate Change." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/13.

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The Aedes aegypti mosquito is responsible for transmission of four vector-borne diseases that cause considerable global morbidity and mortality. Projections of the future effects of global climate change indicate that expansion of this species due to changing habitats is possible. Furthermore, since A. aegypti is highly dependent on human populations for feeding and egg-laying sites, changing human population characteristics are likely to alter the risk of exposure for humans based on geographic location. This study aims to create future potential risk maps for human exposure to A. aegypti usi

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21

Becheler, Arnaud. "Environmental demogenetic model." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS145/document.

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Les invasions biologiques étant des processus raisonnablement limités dans le temps et l’espace, elles fournissent un cadre propice à l’étude de modèles complexes par simulation numérique. Nous mettons à profit la méthode de Calcul Bayésien Approché (ABC) pour étudier l’invasion du frelon asiatique (Vespa velutina), en estimant les paramètres d’un modèle probabiliste démographique et génétique spatialement explicite. La croissance des populations dans chaque unité paysagère est décrite par une fonction des conditions environnementales locales, tandis que les flux migratoires entre populations

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22

Douglas, M. R., M. A. Davis, M. Amarello, et al. "Anthropogenic impacts drive niche and conservation metrics of a cryptic rattlesnake on the Colorado Plateau of western North America." ROYAL SOC, 2016. http://hdl.handle.net/10150/617208.

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Ecosystems transition quickly in the Anthropocene, whereas biodiversity adapts more slowly. Here we simulated a shifting woodland ecosystem on the Colorado Plateau of western North America by using as its proxy over space and time the fundamental niche of the Arizona black rattlesnake (Crotalus cerberus). We found an expansive (= end-of-Pleistocene) range that contracted sharply (= present), but is blocked topographically by Grand Canyon/Colorado River as it shifts predictably northwestward under moderate climate change (= 2080). Vulnerability to contemporary wildfire was quantified from avail

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23

Zaffos, Andrew A. "Diagnosis and prediction of variations in the environmental distributions of marine fossil taxa across space and time." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1415625754.

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24

Close, Bowen. "Niche to Mainstream in Sustainable Urban Food Systems: The Case of Food Distribution in Portland, Oregon." Scholarship @ Claremont, 2006. http://scholarship.claremont.edu/pomona_theses/9.

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To address the negative environmental, political, and social consequences of the dominant, industrialized global food system, communities around the world have developed goals and values underlying a sustainable food system. Conceptualizing food production, distribution, and consumption as systems helps clarify the ways food affects social and natural environments, with the distribution element as the critical juncture where the product reaches the consumer. Urban food systems are a particularly important environment in which to study movements toward sustainability. This paper focuses on t

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25

TIROZZI, PIETRO. "Long-term responses of bird populations to environmental and climatic changes." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/403719.

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Un’approfondita conoscenza circa le risposte delle popolazioni selvatiche ai cambiamenti ambientali e climatici rappresenta un obiettivo primario per migliorare le politiche ambientali e promuovere la conservazione della biodiversità. La capacità di una popolazione nel rispondere ai cambiamenti che avvengono negli ecosistemi è uno dei principali fattori che può determinare la sua traiettoria nel tempo e nello spazio. La presente tesi illustra, sia da un punto di vista metodologico che applicativo, quattro studi che analizzano alcuni tipi di risposte a lungo termine delle popolazioni di uccelli

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26

Hart, Francis Charles. "The Effect of Environmental Variables on Local West Nile Virus Infection Rates in Culex Mosquitoes Using an 'Ecological Niche' Model." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1271699445.

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Carrascosa, Vidal Angel Cobos. "Importância da heterogeneidade e quantidade de recursos na riqueza e redundância funcional de formigas arborícolas." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/3857.

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Dufour, Claire. "Écologie de la divergence et de la coexistence : étude empirique chez deux espèces du genre Rhabdomys." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20233.

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Comprendre les mécanismes évolutifs permettant la persistance des populations face aux changements environnementaux est au centre des préoccupations tant scientifiques que sociétales, de par l'anthropisation grandissante. L'étude i) de la diversification des espèces dans des environnements contrastés et ii) de la coexistence entre ces espèces permet d'appréhender ces mécanismes. En effet, la coexistence entre espèces, et donc leur persistance, dépend de leur niveau de divergence, tant sur des caractères écologiques que reproducteurs. Les études empiriques présentées dans cette thèse portent su

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29

Guillon, Michaël. "De la physiologie à la répartition : adaptations climatiques et sensibilité thermique chez une relique glaciaire." Phd thesis, Poitiers, 2012. http://tel.archives-ouvertes.fr/tel-00996071.

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L'un des objectifs majeurs en écologie est de comprendre les déterminants de la distribution des organismes. La répartition des espèces est le produit d'une réponse dynamique face à l'environnement biotique et abiotique. Il est primordial d'élaborer des inférences solides sur les contraintes pour identifier les facteurs proximaux de la distribution des espèces. Chez les ectothermes, la température corporelle est directement dépendante de la température ambiante qui va affecter la physiologie, le budget d'activité et par conséquent la plupart de leurs traits d'histoire de vie. La prévalence des

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Amarante, Débora Delevati do. "DISTRIBUIÇÃO ESPAÇO-TEMPORAL DE COMUNIDADES DE GIRINOS (AMPHIBIA: ANURA) NO CERRADO SUL-MATO-GROSSENSE." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/11183.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>We studied species richness, abundance and spatial-temporal distribution of tadpole communities in eight ponds in an area of Cerrado in the state of Mato Grosso do Sul, Brazil. We carried out this study during a rainy season (October 2009 to March 2010). We determined the spatial and temporal niche breadth by standardized Levins index, and we used null models to explore the patterns of niche overlap. Additionally, we evaluated the influence of environmental descriptors and spatial distribution of ponds on the studied communities us

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Harper, Kirsten Jennifer. "Trophic niche and detection of the invasive signal crayfish (Pacifastacus leniusculus) in Scotland." Thesis, University of Stirling, 2015. http://hdl.handle.net/1893/22355.

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Aquatic invasive species are a major threat to native freshwater biodiversity. The North American signal crayfish Pacifastacus leniusculus was introduced to Great Britain during the 1970s and is now widely distributed throughout England, Wales and Scotland. First recorded in Scotland in 1995, P. leniusculus is now established at more than twenty sites. The only other introduced crayfish species present in Scotland is the white-clawed crayfish Austropotamobius pallipes. A. pallipes is restricted to only two locations in Scotland, Loch Croispol and Whitemoss Reservoir. P. leniusculus negatively

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MACRI', CARMELO NICODEMO. "Adaptations of plant species to environmental changes." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1003150.

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The future climate change represents the biggest challenge for plant and animal species. The scenarios forecasted by the IPCC predict a global increase in temperatures and regional changes in rainfall during this century. Therefore, studying the relationship between climate and several traits of species is crucial in our understanding of the effects that future changes may have on plants. Species growing along a wide environmental gradient are a suitable study model to verify the relationship between intraspecific variability and both current and future climate. The aim of my PhD project is to

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Carolan, Kevin. "Ecological niche modelling and its application to environmentally acquired diseases, the case of Mycobacterium ulcerans and the Buruli ulcer." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20178/document.

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L'ulcère de Buruli est une maladie émergente tropicale négligée. Il provoque une défiguration et une incapacité permanente pour les victimes. L'agent causal est Mycobacterium ulcerans. Cependant, le réservoir environnemental et le mode de transmission de cette bactérie ne sont pas connus. Les tentatives visant à gérer la maladie ont été freinées par le manque de connaissances concernant le mode de transmission ainsi que le réservoir environnemental de M. ulcerans. Certains écosystèmes et habitats ont été associés au risque de contracter cette mycobactérie, notamment les milieux aquatiques d'ea

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Yguel, Benjamin. "Sortir de sa niche ancestrale : conséquences pour les interactions trophiques, le cas du chêne pédonculé et sessile." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00793651.

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Le conservatisme phylogénétique de niche se définit par la conservation, au cours du temps, de la niche écologique et des traits écologiques associés. Des espèces phylogénétiquement proches auront alors tendances à occuper des niches similaires, incluant des conditions abiotiques mais aussi des interactions biotiques similaires. Ainsi, un individu isolé phylogénétiquement de ses voisins, pourrait être considéré comme présent dans une nouvelle niche. Dans cette thèse, nous nous sommes intéressés aux interactions trophiques des individus de plantes hôtes colonisant une nouvelle niche, représenté

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Nyström, Sandman Antonia. "Modelling spatial and temporal species distribution in the Baltic Sea phytobenthic zone." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-54269.

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Statistical modelling is often used to relate the presence or abundance of species to environmental predictors, thereby providing a basis for predictive mapping of species or biodiversity. The variables included must thus be relevant and reflect actual changes in the environment. Therefore, the quantification of species–environment relationships is an important aspect of predictive modelling. This thesis examines how phytobenthic species or communities in the Baltic Sea relate to environmental gradients, and if different aspects of phytobenthic species distribution in the Baltic Sea could be e

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Kantelis, Theron Michael. "Black Bears (Ursus americanus) versus Brown Bears (U. arctos): Combining Morphometrics and Niche Modeling to Differentiate Species and Predict Distributions Through Time." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3262.

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Late Pleistocene American black bears (Ursus americanus) often overlap in size with Pleistocene brown bears (U. arctos), occasionally making them difficult to diagnose. Large U. americanus have previously been distinguished from U. arctos by the length of the upper second molar (M2). However, the teeth of fossil U. americanus sometimes overlap size with U. arctos. As such, there is need for a more accurate tool to distinguish the two species. Here, 2D geometric morphometrics is applied to the occlusal surface of the M2 to further assess the utility of this tooth for distinguishing U. americanu

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Giovanelli, João Gabriel Ribeiro [UNESP]. "Modelagem de nicho ecológico de anuros da Mata Atlântica." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/99510.

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Made available in DSpace on 2014-06-11T19:30:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-07-10Bitstream added on 2014-06-13T20:00:12Z : No. of bitstreams: 1 giovanelli_jgr_me_rcla.pdf: 1418275 bytes, checksum: 89bfd36ef09106ccce055bdb990471ce (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A modelagem de nicho ecológico é uma ferramenta potencialmente importante para o entendimento dos padrões de distribuição geográfica dos organismos da Mata Atlântica, gerando assim informaç

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Bournez, Laure. "Facteurs explicatifs de la répartition spatiale en Afrique australe de deux espèces de tiques parapatriques, vectrices de la cowdriose, Amblyomma variegatum et Amblyomma hebraeum et rôle de la compétition." Thesis, Antilles-Guyane, 2014. http://www.theses.fr/2014AGUY0705/document.

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La connaissance des facteurs qui influent sur les populations de tiques et en particulier sur leurs distributions est un préalable indispensable à l’étude des maladies qu’elles transmettent. Parmi eux, l’importance des facteurs biotiques et en particulier celle de la compétition interspécifique est peu connue et souvent négligée. L’objectif de ce travail était d’évaluer le rôle de la compétition interspécifique sur la distribution de deux espèces de tiques d’importance vétérinaire, Amblyomma variegatum et A. hebraeum. Alors que seule A. variegatum favorise la transmission de la dermatophilose,

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Hornoy, Benjamin. "Processus évolutifs contribuant au succès envahissant de l'ajonc d'Europe, Ulex europaeus." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00740154.

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Etudier les invasions biologiques est essentiel dans le cadre de la conservation de la biodiversité. De plus, elles représentent de véritables expérimentations grandeur nature pour appréhender les processus écologiques et évolutifs. La problématique de cette thèse est d‟étudier la contribution de processus évolutifs dans le succès envahissant de l‟ajonc d‟Europe, Ulex europaeus, à travers le monde, notamment en relation avec la perte de ses ennemis naturels (Enemy Release). La première partie s‟intéresse à l‟évolution de l‟ajonc dans sa zone d‟origine et au moment de l‟introduction dans de nou

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Escobar, Diego Fernando Escobar. "Fenologia da dispersão e estratégias de germinação de sementes de plantas lenhosas e herbáceas no Cerrado /." Rio Claro, 2019. http://hdl.handle.net/11449/183408.

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Orientador: Leonor Patrícia Cerdeira Morellato<br>Resumo: A germinação de sementes e estabelecimento de plântulas são as etapas iniciais e cruciais do ciclo de vida das plantas, sendo importantes determinantes dos padrões de distribuição, diversidade e dinâmica das comunidades vegetais. Nos ecossistemas sazonais, a disponibilidade de água no solo e a heterogeneidade do ambiente são os principais fatores limitantes da germinação e estabelecimento das plântulas. Nestes ambientes a fenologia da dispersão das sementes, o nicho de germinação e a dormência devem sincronizar a germinação com o início

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Giovanelli, J. G. R. "Modelagem de nicho ecológico de anuros da Mata Atlântica /." Rio Claro : [s.n.], 2009. http://hdl.handle.net/11449/99510.

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Resumo: A modelagem de nicho ecológico é uma ferramenta potencialmente importante para o entendimento dos padrões de distribuição geográfica dos organismos da Mata Atlântica, gerando assim informações para o desenvolvimento de estratégias de seleção de áreas prioritárias para conservação da biodiversidade. Os anfíbios anuros, por serem ecologicamente especializados, são excelentes organismos modelo para estudos de biogeografia, o que torna interessante a modelagem de nicho ecológico deste grupo. No entanto, apesar da evolução recente da área de modelagem de nicho, é difícil escolher um método

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Carlucci, Marcos Bergmann. "Padrões funcionais de organização de árvores juvenis em manchas florestais na serra do sudeste do Rio Grande do Sul." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/30192.

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Uma das mais relevantes perspectivas que buscam explicar como as comunidades ecológicas se organizam é a teoria do nicho, que se divide em duas linhas de pesquisa com filosofias opostas. A primeira enfatiza que diferenças nas características funcionais de organismos permitem sua coexistência, enquanto que a segunda avalia até que ponto membros de uma mesma comunidade tendem a exibir similaridade em seus atributos funcionais. Uma variedade de métodos analíticos tem sido desenvolvida para avaliar mecanismos ligados a cada um dos processos. Explorando o padrão de distribuição de atributos de comu

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Barbosa, Fabiana Gonçalves. "Modelos de distribuição de espécies invasoras : tendências e aplicações." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/49285.

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Modelos de distribuição de espécies, também conhecidos como modelos bioclimáticos ou modelos de nicho ecológico, têm sido aplicados em inúmeras questões ecológicas, incluindo espécies invasoras. Essa tese identificou as principais tendências e lacunas de estudos sobre o uso de modelos de distribuição de espécies para predizer a distribuição potencial de espécies invasoras (primeiro artigo). Adicionalmente, aplicou-se modelos de distribuição de espécies para predizer a distribuição potencial de Eragrostis plana Nees na América do Sul e verificar se ocorreu mudança de seu nicho bioclimático dura

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Ljungberg, Alice. "Omställning till hållbara livsmedelssystem : Kommersiell stadsodling i Stockholm." Thesis, Uppsala universitet, Naturresurser och hållbar utveckling, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-426761.

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De storskaliga globala livsmedelssystemen står inför ett antal utmaningar inom hållbar utveckling. Livsmedelssystemens nuvarande utformning resulterar i hållbarhetsproblem som förlust av biologisk mångfald och utarmning av jordar, långa livsmedelskedjor och stora avstånd mellan konsument och producent. Klimatförändringarnas effekter och den ökande urbaniseringen bidrar ytterligare till problematiken. Behovet av en omställning till hållbara livsmedelssystem är därför stort och kräver innovativa lösningar såväl som en omfördelning av naturresurser. Ett exempel på en systeminnovation är stadsodli

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Catella, Samantha A. "Investigating herbaceous layer plant community patterns: when does abiotic complexity matter?" Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1559905264222712.

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Buisson, Laetitia. "Poissons des rivières françaises et changement climatique : impacts sur la distribution des espèces et incertitudes des projections." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT005A/document.

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Les changements climatiques et leurs impacts sur la biodiversité font aujourd'hui l'objet d'une attention croissante de la part de la communauté scientifique et des gestionnaires des écosystèmes naturels. En effet, le climat influence la biologie et l'écologie des espèces animales et végétales, depuis leur physiologie jusqu'à leur répartition. Les modifications climatiques pourraient donc avoir des répercussions importantes sur les espèces et les assemblages. Au sein des écosystèmes aquatiques continentaux, les poissons de rivière sont des organismes incapables de réguler leur température corp

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Miklós, Zsófia. "Governance of Innovative Building Practices: Case of the 3rd District Municipality of Budapest." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325028.

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This paper presents an analytical framework of governing innovative building practices at a municipal level based on conclusions drawn from the Strategic Niche Management (SNM) approach. The analytical framework viewed the Village House Block demonstration project and EnSURE transnational research collaboration as important facilitators to create the necessary conditions for governing innovation during the renovation of the outdated building stock located in the 3rd District Municipality of Budapest, Hungary. These necessary conditions were articulated in accordance with the three internal pro

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Evans, Charlotte Louise. "The biological and therapeutic significance of tumour necrosis : identification and characterisation of viable cells from the necrotic core of multicellular tumour spheroids provides evidence of a new micro-environmental niche that has biological and therapeutic significance." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/13961.

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Tumour necrosis has long been associated with poor prognosis and reduced survival in cancer. Hypotheses to explain this include the idea that as aggressive tumours tend to grow rapidly, they outgrow their blood supply leading to areas of hypoxia and subsequently necrosis. However whilst this and similar hypotheses have been put forward to explain the association, the biological significance of the cells which make up necrotic tissue has been largely ignored. This stems from the belief that because a tumour is more aggressive and fast growing it develops areas of necrosis, rather than, the tumo

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Evans, Charlotte L. "The biological and therapeutic significance of tumour necrosis. Identification and characterisation of viable cells from the necrotic core of multicellular tumour spheroids provides evidence of a new micro-environmental niche that has biological and therapeutic significance." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/13961.

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Tumour necrosis has long been associated with poor prognosis and reduced survival in cancer. Hypotheses to explain this include the idea that as aggressive tumours tend to grow rapidly, they outgrow their blood supply leading to areas of hypoxia and subsequently necrosis. However whilst this and similar hypotheses have been put forward to explain the association, the biological significance of the cells which make up necrotic tissue has been largely ignored. This stems from the belief that because a tumour is more aggressive and fast growing it develops areas of necrosis, rather than, the tumo

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Delgado, de la flor Yvan A. "Spider and Beetle Communities across Urban Greenspaces in Cleveland, Ohio: Distributions, Patterns, and Processes." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587656050129337.

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