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 15 of 15 for “"Species richness and composition"”.
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Species richness and composition of avifaunal communities in a complex Amazonian landscape
… identify the effect that habitat heterogeneity and seasonality have on the diversity of birds in lowland Amazonia. This study aimed to identify how species richness and composition of avifaunal communities in the lower Rio Purús region of central Amazonia compare across terra firme, whitewater …
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The Effect of Spatial and Environmental Drivers on Patterns in Species Richness and Composition
… eight manuscripts with methodological, empirical and theoretical contributions that aim to enhance the understanding of species richness and composition patterns and their underlying drivers. Islands and isolated systems are in the focus of this work. Islands provide optimal conditions to study …
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Molecular screening of potential bat-borne hantavirus and determination of species richness and composition of bats in selected habitats within the woodland and savanna biomes in Namibia
Bats are present and they play unique ecological roles in various habitats in Namibia. Yet the patterns of species richness and composition of bats associated with these habitats within different biomes in Namibia still remain unknown. Bats are also important carrier hosts and transmitters of …
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Species richness and metacommunity dynamics in bryophytes
Bryophyte species richness and composition were analysed on limestone boulder habitats across twenty sites in Malta. These boulders acted as standard units for studying the effect of environmental, microtopographical and spatial factors on bryophyte metacommunities. The results indicated that …
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Survey of the Fishes and Habitat in the Upper Moreau River, Perkins County, South Dakota
The goal of this study was to document the fishes and habitat characteristics in the upper Moreau River, Perkins Country, South Dakota. Presently, the status of several species, including western silvery minnows, plains minnows, and flathead chubs, is in question within the Missouri River basin of …
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Characterizing spatial and temporal trends in fish community diversity in the inland lakes of Isle Royale, MI, USA
The inland lakes of Isle Royale, MI have remained relatively isolated from human impact, providing an opportunity to explore how fish diversity has natural shifted with minimal confounding effects. I analyzed fish assemblages of 23 lakes sampled in the 1920s, 1990s, and 2020s to 1) assess temporal …
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Unravelling abiotic and biotic drivers of biodiversity change in local plant and invertebrate communities after 80 years - a re-visitation study on the Studland peninsula.
… to long-term environmental change via changes in species richness and composition is an urgent question in the 21st century as anthropogenic forces drive biodiversity declines across taxa and regions. As environmental conditions change over time, effects may cascade through co-occurring taxa, …
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Determinants of native and exotic plant species diversity and composition in remnant oak savannas on southeastern Vancouver Island
Many regional and local factors can influence the distribution of native and exotic species in ecological communities. I examined the regional- and local-scale determinants of native and exotic vascular plant species richness and composition in a highly fragmented oak savanna ecosystem on …
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Evaluating the use of acoustic monitoring for surveying tropical birds
… (SRS) for surveying tropical bird communities and species relative to traditional point count surveys. To address this goal, I compared species richness, composition and detection probability of 20 species between SRS and point counts across six tropical habitats in the northeastern Yucatan …
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Characterization of Vascular Plant Species Composition and Relative Abundance in Southern Appalachian Mixed-Oak Forests
… south aspect, mixed-oak forests in the Ridge and Valley and Allegheny Mountain physiographic provinces of Southwestern Virginia and West Virginia to address questions concerning the variability in species composition, richness, and relative abundance of vascular plant species in those …
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Plant-pollinator interaction networks in remnant and reconstructed Palouse Prairie in Eastern WA, USA
… providing pollinators with floral resources and nesting habitat. This is especially true for prairie restoration, which struggles to establish diverse, abundant native forb communities. The USDA Conservation Reserve Program State Acres for Wildlife Enhancement (CRP SAFE) Palouse Prairie …
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Fish Community Assembly in the Missouri River Basin
… intended to explain fish community structure and composition therein. I focused on relations between environmental characteristics and fish species because abiotic factors are considered most important for stream fish community dynamics, particularly within harsh streams, such as those of the …
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Environmental and biogeographic influences on the distribution and composition of the southern Cape forests (Veld type 4)
This study aims at explaining the distribution and composition of the southern Cape forests, the largest forest complex in southern Africa. These are the only forests in southern Africa which are actively and scientifically managed for their products and values. Population growth due to forestry, …
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Influence of Forest Management on Bumblebee-Plant Networks and Community Compositions in Eastern Kentucky Forest Openings
Both the productivity of agricultural systems and functioning of terrestrial ecosystems are reliant on animal pollinators to facilitate plant reproduction. Yet the integrity of these pollination services is threatened by the declines of pollinators. Mounting evidence indicates landscape …
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Responses of Above- and Belowground Forb and Plant Species Diversity to Grazing Exclusion and Fire in the Northern Great Basin Sagebrush Steppe
… regimes in the pre-1936 Taylor Grazing Act era and historical fire suppression have contributed to an overall decrease in native deep-rooted perennial bunch grasses and forbs, an increase in annual invasive grasses, and greater sagebrush dominance. Although not as widely used as perennial …