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 62 for “"species assemblages"”.
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Coral reef soundscapes : spatiotemporal variability and links to species assemblages
… are constantly in a state of flux: the resident species assemblages vary considerably in space and time. However, the drivers of this variability are poorly understood. Tracking these changes and studying how coral reefs respond to natural and anthropogenic disturbance can be challenging and …
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Coral reef soundscapes: spatiotemporal variability and links to species assemblages
… are constantly in a state of flux: the resident species assemblages vary considerably in space and time. However, the drivers of this variability are poorly understood. Tracking these changes and studying how coral reefs respond to natural and anthropogenic disturbance can be challenging and …
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Effects of natural vegetation, fire and alien plant invasion on bird species assemblages in mountain fynbos of the southwestern Cape Province, South Africa
… on birds of fine-scale differences in plant species assemblage and vegetation structure, and of two major disturbance factors (woody alien plant infestation and fire), were investigated in Mountain Fynbos at two sites in the southwestern Cape Province, South Africa. Three associated processes …
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Vegetative communities as indicators of ground beetle (Coleoptera: Carabidae) diversity
… must be effective spatial representations of the species assemblages present on the landscape. In this study, I determined whether land units classified by vegetative communities predicted the community structure of a diverse group of invertebrates—the ground beetles (Coleoptera: Carabidae). …
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Climate and Bioinvasives drivers of change on South African Rocky shores?
… were to assess spatio-temporal change in macro species assemblages at sites located around the South African coast. Detected changes were considered in parallel with regional patterns of bioinvasion and climate change driven shifts in temperature trends over comparable time scales.
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Using biological traits analysis to investigate ecological functioning of cold-water coral reefs
… in all oceans. Past research has focused on the species assemblages found on cold-water coral reefs. The species found on cold-water coral reefs are representative of the species assemblages found in the surrounding waters, with almost no true obligate reef species. No past studies have attempted …
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Freckled Darter (Percina lenticula) And Other Fishes’ Usage Of Wood Pile Habitat
… that use the habitat, both for individual species and entire species assemblages. <em>Percina lenticula</em> is a species of special concern in the state of Mississippi due to low numbers of historical records. This species is known to inhabit wood pile habitat in rivers, a habitat that has …
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Carabid Beetle Ecology as a Function of Disturbance in Temperate and Tropical Forests
… knowledge of the changes and patterns of forest species in relation to disturbance events are important to our understanding of ecosystem change. The focus of this research is to examine the effects of forest disturbance on species distributions and species assemblages, with carabid beetles …
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Environmental factors related to the abundance and distribution of brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) and seasonal movements of brown trout in selected Virginia streams
… and distribution. Furthermore, consistent fish species assemblages relative to brown trout distribution were observed in the study streams. The movements of tagged brown trout in two streams were assessed for the period from June 1981 to July 1982. Most brown trout remained within 200 m of …
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Faunal variation and its potential for sampling bias in the Morgarts Beach Member of the Yorktown Formation (Pliocene)
… study was performed on molluscan fossil assemblages collected from the Pliocene Morgarts Beach Member of the Yorktown Formation, located in Isle of Wight County, southeast Virginia. The principal objectives of this study were to examine potential sampling problems and biases inherent in …
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ECOLOGY OF GROUND-DWELLING CARABID BEETLES (COLEOPTERA: CARABIDAE) IN THE PERUVIAN ANDES
Studies of diversity and species distributions are crucial in light of a predicted 4-6 degrees C warming by the end of the 21st century, especially in the tropics where many species may be especially sensitive to climate change. Little is known about patterns of insect diversity and richness in …
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Bryophyte diversity patterns in a fragmented landscape : a case study of South African West Coast renosterveld
… of this study are to; Document bryophyte species assemblages in remnant fragments of renosterveld vegetation, investigate the effect of fragment size, isolation and heterogeneity on bryophyte diversity patterns in renosterveld, determine the extent to which fragments are nested and …
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Edaphic factors and rhizobia influence the distribution of legumes (Fabaceae) in the Core Cape Subregion of South Africa
… in the CCR landscape. Instead, distinct legume species assemblages tend to occupy particular habitats within the landscape. The drivers of this distribution pattern are yet to be determined. In this thesis, it was hypothesized that edaphic factors (soil chemical and physical characteristics) and …
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Differences in Fish Abundance Among Habitat Types in a Warmwater Stream; The James River, South Dakota
… biomass (kg/hectare) were calculated for three species assemblages: primary game fish, secondary game fish, and non-game fish. Adult density of all species assemblages combined was higher in the complex habitats (1,760 fish/hectare) than the simple habitats (934 fish/hectare). Patterns in …
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Chironomid-based paleotemperature reconstruction of the North Slave Region, Northwest Territories during the Late Holocene
… shifts were identified in the chironomid species assemblages, which indicated that these lakes experienced very little environmental change over the last approximately 500 years. Discrepancies were identified between the chironomid-temperature records which may be due to site-specific …
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Relative Roles of Environmental Conditions and Riverscape Connectivity On Fish Metacommunity Structure
… of how riverscape connectivity influences species assemblages has been identified as critical for effective conservation management and restoration of fish communities in dendritic river networks. This study investigates the relative roles of abiotic conditions and spatial factors in …
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Structure of relict arctic plant communities along the north shore of Lake Superior
… cold lake-supported microclimate. Although these species are threatened by climate change, there have been few studies about their structure and diversity and relation to abiotic factors. We characterized the plant communities and abiotic environment of one of the largest expanses of arctic …
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Establishment of woody savannah species on various mined substrates: Toward rehabilitating self sustaining plant communities at Navachab Gold mine
… to establish indigenous savannah woody species. The main objective of this project was to investigate the establishment of indigenous vegetation on mined substrates and develop an understanding of species assemblage and habitat preference in the Karibib thorn bush savannah. The main …
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Comparative analysis of aquatic insect, amphipod, and isopod community composition along environmental gradients in rheocrene spring systems of Missouri
… this study was to create a comprehensive list of species present in all studied systems, as well analyze changes in community composition among and within spring systems in relation to environmental gradients in selected springs. Sorenson's similarity coefficient and UPGMA cluster analysis showed …
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Ecological Conservatism and Traits Predict Introduction Risk and Co-Occurrence for the Flora of Chicago
… of natural habitats and redistribution of plant species has changed the makeup of plant communities, generally leading to increased homogenization and decreased biodiversity. While many plant species have suffered from human activity, others have thrived due to their skill at colonizing habitats …
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