Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"habitat loss and fragmentation"”.
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Modelling the structuring of animal communities in heterogeneous landscapes : the role of individual home range formation, foraging movement, competition and habitat configuration
This thesis aims at a better mechanistic understanding of animal communities. Therefore, an allometry- and individual-based model has been developed which was used to simulate mammal and bird communities in heterogeneous landscapes, and to to better understand their response to landscape changes …
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Extensive green roof design in the City of Cape Town : barriers and opportunities for developing a green industry
In today's world of increasing energy costs and rapid ecosystem service decay, a result of direct human disturbance from development, habitat loss and fragmentation and the increasing frequencies of extreme weather events, it is critical that building practices in the next decade adopt a more …
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Sex-specific Habitat Use and Responses to Fragmentation in an Endemic Chameleon Fauna
… collection for the international pet trade and habitat loss and fragmentation. A recent field study reports a highly female-biased sex ratio in the Eastern Arc Endemic Usambara three horned chameleon, Trioceros deremensis, a large, sexually dimorphic species. This species is collected for …
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Predator Behavior and Prey Demography in Patchy Habitats
Habitat loss and fragmentation are among the greatest threats to biodiversity, and these threats can be exacerbated or alleviated by the presence of interacting species. The effect of habitat loss and fragmentation on predator-prey systems has received extensive theoretical attention, but empirical …
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Effects of habitat degradation on the evolutionary dynamics of populations in a rainforest cycad (Gymnospermae)
In addition to habitat loss and fragmentation, habitat degradation can have important consequences for biodiversity and population persistence, including effects on ecological and genetic processes beyond decreased demographic viability and the loss of genetic variation. Particularly interesting is …
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Connecting backyard wildlife habitats in Austin, TX : case study of Wildlife Austin
… one of the leading threats to biodiversity and wildlife habitat (McKinney 2002; Shochat et al. 2006). Urban environments are humandominated systems, yet they support wildlife habitat and provide meaningful ecological functions. Methods to conserve biodiversity and minimize habitat loss and …
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Detection, Occupancy, Abundance, and Mercury Accumulation of the Alligator Snapping Turtle (Macrochelys temminckii) in Texas
<p>Land use practices and physical alterations of ecosystems result in habitat loss and fragmentation, while chemical alterations, such as pollutant input, reduce habitat quality and health of exposed organisms. Here, I investigated the effects of watershed- and local-scale environmental variables …
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The impacts of habitat fragmentation of Tsitsikamma fynbos, South Africa, on avian nectarivore presence, abundance, and pollination
Habitat loss and fragmentation of natural habitat, and other global change drivers resulting from human expansion and development, are putting ecosystems and biodiversity at risk. The Cape Floristic Region (CFR), confined to South Africa and known for its high biodiversity of especially plants, has …
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Conservation genetics of conflict in the Asian elephant, Elephas maximus
… spans 13 countries in south, southeast, and insular Asia. The primary threats to the survival of this species include direct conflict, primarily in the forms of poaching and crop-raiding, as well indirect conflict such as habitat loss and fragmentation. Due to the elephant’s elusive …
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Theoretical Impacts of Habitat Loss and Generalist Predation on Predator-Prey Cycles
Certain herbivores and their predators undergo high amplitude periodic fluctuations in abundance in northern latitudes but exhibit damped cyclic dynamics in their respective southern ranges. Generalist predation and habitat loss have been identified as two features of southern habitats that may …
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Interaction strengths and net effects in food web models
Understanding how dynamic ecological communities respond to anthropogenic drivers of change such as habitat loss and fragmentation, climate change and the introduction of alien species requires that there is a theoretical framework able to predict community dynamics. At present there is a lack of …
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The density of leopards in a mixed-use landscape in the Western Cape, South Africa
Large carnivores face numerous threats, including habitat loss and fragmentation, direct killing, and prey depletion, leading to significant global range and population declines. Despite these threats, leopards (Panthera pardus) persist outside protected areas throughout most of their range, …
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Utilizing Acoustic Methods to Identify Bat Species, and to Assess Their Habitat Use and Perception of Owls
… because this area is home to more rare plant and animal species than any other similarly sized area in Ohio. Increasing our knowledge about bats, a vulnerable taxon, in this diverse region is critical due to a decline in bat populations caused by habitat loss and fragmentation, wind energy, …
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Songbird community ecology and habitat selection in the Chicago area
… has considerable effects on native flora and fauna, and is likely the most important driver of extinction. Two major stressors that have been shown to strongly impact wildlife communities in urban areas are habitat loss and fragmentation, which expose organisms in remnants to increased …
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Conserving Connectivity: Ecological Determinants of Gene Flow in Plants at the Landscape Scale
With intensifying global pressures of habitat loss and fragmentation, there is an increasing need to manage landscapes in a way that maintains gene flow among previously continuous populations. This requires a detailed understanding of the scale of gene flow in nature and of how aspects of the …
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Nesting Success of Grassland Birds in Fragmented and Unfragmented Landscapes of North Central South Dakota
Decline of grassland bird species has frequently been linked to habitat loss and fragmentation. A large amount of remaining native prairie is in the form of grazed pastureland; however, few studies have focused on assessing pastureland as habitat. While studies have found that species occurrence, …
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Defending Wild Dogs: Population Dynamics and Disease in Endangered African Wild Dogs
… carnivores whose population is decreasing from habitat loss and fragmentation, interspecific competition, and disease. Survival rates are especially low in Kruger National Park (KNP), though it is unclear why. I estimated the abundance in KNP and survival rates over different time spans, six …
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Predicting the Repercussions of Anthropogenic Landscape Modifications on the Biota Using Species Focused Adaptable GIS and Spatial Dynamic Models
Habitat fragmentation and species invasions are increasingly threatening the survival of native species worldwide. In this context, a set of tools and approaches was developed to help (1) improve our understanding of species relationships to the landscape and predict their habitat usage, population …
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Following the Herd: Modeling Mule Deer Resource Selection in an Era of Solar Expansion
Habitat loss and fragmentation are occurring globally at unprecedented rates due toanthropogenic development, and is a major cause of biodiversity loss. Quantifying human impacts on natural environments and loss of biodiversity is difficult to quantify. The loss of biodiversity coupled with the …
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