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 82 for “"habitat degradation"”.
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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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The Biodiversity Mirage: the Effects of Habitat Degradation and Exotic Predators on Ground-Dwelling Forest Birds, Tenrecs and Lemurs in Northeastern Madagascar
… tenrecs (Lipotyphla: Tenrecidae) and lemurs to habitat degradation and the presence of exotic predators, and monitor population trends at resurveyed sites from 2008 to 2013. Using camera trap surveys and distance sampling, we observed 26 bird species (n = 4,083 observations), three spiny tenrec …
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Nutritional condition and stress response of fishes along a gradient of habitat quality in the St. Lawrence River: physiological consequences of anthropogenic habitat degradation
Anthropogenic alterations to terrestrial habitat (e.g., urbanization, deforestation, agriculture) can have a variety of negative effects on riverine systems that flow through disturbed landscapes. These in-stream changes can alter aquatic population size and community structure; however, the …
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The functional ecology of Eastern Rûens Shale Renosterveld
… an ever increasing rate due to drivers such as habitat destruction and climate change. The systematic degradation of natural habitats witnessed today is often accompanied by a loss of ecosystem functioning and services which not only endangers the future of humankind but has consequences for all …
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Characterization of Soundscapes in Shallow Water Habitats of the Florida Keys (USA) and Their Influence on the Settlement of Larval Fish and Invertebrates
… to explore the effect of ecosystem change and habitat restoration on underwater soundscapes and larval recruitment. I had four main objectives: (1) characterize the underwater soundscapes of three near-shore, benthic habitats: mangrove islands, seagrass meadows, and hard-bottom (Chapter 2); (2) …
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Impacts of Habitat, Resource Addition, and Predator Exclusion on Rodent Community Structure and Hantaviruses in the Neotropics
… as agricultural expansion, deforestation, and habitat degradation all have been linked to zoonotic disease emergence. Despite these commonalities, our mechanistic understanding of what drives them is lacking. Moreover, genomic surveillance in wildlife populations is critical for risk assessment …
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Conservation of the native freshwater fishes of the Cape floristic region (South Africa) : management of non-native species
… in the world. Increasing demand for freshwater, habitat degradation and the introduction of non-native species, will continue to place pressure on the remaining native freshwater fishes. A meta-analysis estimated that more than 90% of river habitat in three major catchments has been invaded by …
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Hotspots, Extinction Risk and Conservation Priorities of Greater Caribbean and Gulf of Mexico Marine Bony Shorefishes
… on each species’ distribution, population, habitats and threats and experts at three Red List workshops assigned a global level extinction risk category to nearly 1,000 greater Caribbean shorefishes. Since conservation is mostly implemented at a sub-global level, regional Red List …
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Development of juvenile culture techniques and testing of potential biomarkers of environmental stress in freshwater mussels (Bivalvia: Unionidae)
… declined in recent decades, principally due to habitat degradation from poor land-use patterns and pollutants. A study was undertaken to determine the feasibility of using river water in a flow-through culture system to rear juvenile freshwater mussels. The culture method placed juvenile …
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Death by a thousand cuts: the role of pesticides, predators, and habitat patch characteristics on wild bee and insect communities
Habitat degradation, loss, and fragmentation are some of the primary drivers of species loss globally. These processes occur mainly because of human actions and disproportionately impact ecologically and economically important taxa such as bees. This dissertation aims to address how habitat …
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Roads and wildlife: a study of the effects of roads on mammals in roadside habitats
… of roads in the ecological landscape include habitat loss, habitat fragmentation and habitat degradation. These interrupt and modify natural processes, altering community structures and population dynamics. The large number of animal fatalities from road traffic accidents is also of concern. …
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Effect of riparian land use on the biotic integrity of fish assemblages in Black Creek, Chattanooga, Tennessee
… (biotic integrity), water quality, instream habitat, and riparian land-use features at eight sites in Black Creek, May-June 2000. Water quality conditions (temperature, dissolved oxygen, pH, conductivity) were favorable for stream fishes, but some level of habitat degradation (bank erosion, …
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The Conservation Genetics of Two Emydid Turtles: <i>Emydoidea blandingii</i> and <i>Malaclemys terrapin</i>
… turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently experiencing …
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Mediterranean Wild Edible Plants: Diversity, Conservation and Potential Use
… disappearing due to changes in food systems and habitat degradation. Today, fewer than ten cultivated species account for 90% of the world’s caloric intake, while climate change increasingly threatens their cultivation. In this context, reintegrating WEPs into agricultural systems can contribute …
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Toward sustainable stormwater management : overcoming barriers to green infrastructure
… flooding, sewer overflows, water pollution, and habitat degradation. Under pressure to find cost-effective, environmentally sustainable, and socially responsible solutions to stormwater management, cities are looking to green infrastructure. The term "green infrastructure," when used for …
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Spring-fed streams in Virginia and assessment of livestock impacts
… of two studies surveyed fish communities and habitats in first-order spring streams in Virginia. Springs exhibited low species (3.3) and trophic guild (2.5) richness, and fish densities averaged 0.47 individuals/m². Two species, blacknose dace (Rhinichthys atratulus) and sculpins (Cottus sp.) …
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A Spatial Analysis of the Impact of Development on Wetland Habitat in Mount Pleasant, South Carolina
In response to growing concerns over wetland habitat loss and the associated impact on water resources, federal and state legislation has been enacted to protect vulnerable wetland habitats from the impacts of humans. In order to examine the efficacy of current coastal resource policy and its …
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Effects of urbanization on instream habitat and fish assemblages in the chattanooga metropolitan area, Tennessee-Georgia
… has induced adverse transformations in both habitat quality and biotic health in Chattanooga area streams. Percent urban land use was found to be a stronger correlate of stream conditions than building density. Results from the 10-year comparison suggest that urban development induces stream …
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Maximum Entropy Modeling of Indiana Bat (Myotis Sodalis) Maternity Roost Habitat
… disruption of hibernating bats in caves, summer habitat degradation, and more recently, the onset of White-nose Syndrome. The purpose of this study is to evaluate landscape variables associated with Indiana bat maternity roost trees in an attempt to better understand what factors play a role in …
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