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 80 for “"Habitat Structure"”.
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The effect of habitat structure on reproduction and prey capture of a rare carnivorous plant, Pinguicula lutea
Habitat modification is one of the greatest threats to biodiversity worldwide and the main contributor to the decline of many carnivorous plant species. For carnivorous plants in the Southeast US, including many Pinguicula species (butterwort, Lentibulariaceae), habitat modification via altered …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use By Fish in the Vermillion River, South Dakota
… the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in natural and channelized regions of …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use by Fish in the Vermillion River, South Dakota
… the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in natural and channelized regions of …
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A functional and trait-based approach in understanding ant community assembly in the Soutpansberg Mountains, South Africa
… aspects of species ecological roles such as habitat requirements and resource use. To investigate the factors shaping community assembly along the elevational Soutpansberg transect, ants were used as a model study organism because they are widely distributed geographically, ubiquitous and …
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The influence of size and density of the Camelthorn (Acacia erioloba Meyer) on its keystone role in the Xeric Kalahari
… southern Kalahari, land use practices can change habitat structure profoundly, so that rangelands either became densely wooden through bush thickening or are cleared completely using arboricides or manual tree felling and bush clearance, or are at some stage in between. Demands for the wood of …
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An ecological study of the breeding birds of grassland habitats within Illinois
… to examine the influence of area, vegetation structure, species interactions, and habitat management on community structure. Fragment size was found to strongly influence breeding bird species richness within grasslands. Non-prairie bird species dominated small grasslands whereas prairie bird …
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Variação espacial e temporal na estrutura do habitat e prefência de microhabitat por pequenos mamíferos na Mata Atlântica
Nowadays studies on habitat choice have been worried with scale problems, as spatial as temporal scale. This work was carried out in Guapimirim (22°29'S e 43°00'W), Rio de Janeiro State from February'97 to February'98. The study area is a vicinity of Serra dos Órgãos National Park at Atlantic …
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Ecological niche responses of small mammals to gypsy moth disturbance
… determine differences in small mammal assemblage structure and population dynamics among four oak dominated sites at four different stages of gypsy moth disturbance: a high tree mortality site, a disturbance in process site, a disturbance recovery site, and an undisturbed reference site. More …
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A Vegetation Analysis on Horn Island, Mississippi, ca. 1940 Using Characteristic Dimensions Derived from Historical Aerial Photography
… 18kn off the coast of Mississippi. This island’s habitats have undergone many transitions over the last several decades. The goal of this study was to quantify habitat change over a seventy year period using historical black and white photography from 1940. Using present NAIP imagery from the …
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Influence of habitat and bat activity on moth community composition and seasonal phenology across habitat types
… conservation strategies. Studies of moth habitat use have primarily focused on access to host plants used by specific moth species. How vegetation structure influences moth communities within and between habitats and mediates the activity of insectivorous bats is understudied. Previous …
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The Importance of Cover and Other Habitat Features to The Distribution and Abundance of Illinois Stream Fishes (Sunfish, Cyprinids)
Effects of spatio-temporal changes in habitat structure on the distribution and abundance of stream fishes were assessed using field and laboratory results. Fish distributions in several small Illinois streams were related to the availability of depth and cover features using survey data and cover …
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A Mechanistic and Landscape Scale Approach Quantifying Habitat Suitability of Cheatgrass (Bromus tectorum) Engineered Habitats for Great Basin Reptiles
… In the Great Basin Desert of North America, habitat degradation has led to widespread invasion by a highly successful plant species, cheatgrass (Bromus tectorum). The result has been the alteration of landscape structure and ecosystem function. This novel habitat has been implicated in …
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Species Composition and Spatial Ecology of Amazonian Understory Mixed-Species Flocks in a Fragmented Landscape
… species compositions are affected by changes in habitat structure. I followed 29 mixed-species flocks in different landscapes types such as secondary forests, forest fragments of 10 and 100 ha, and mixes of primary and secondary forest patches. As flocks foraged through their territories, I …
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Investigating the efficiency of reforestation approaches in restoring rainforest biodiversity and function
… the interaction between the recovery of habitat structure, biodiversity and ecosystem functioning, this thesis aims to explore these mechanistic relationships to better understand the causal factors behind ecosystem recovery following restoration. Both mammal and dung beetle community …
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A Reexamination of the Eastern Collared Lizard (Crotaphytus collaris collaris) in Arkansas
<p>Loss of suitable habitat is a threat to species worldwide. Habitat destruction, including loss, change, and fragmentation of habitat, is the leading cause of species extinction. Eastern collared lizards (<em>Crotaphytus collaris collaris</em>) are habitat specialists on glades. Both <em>C. c. …
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How does surface mining impact surrounding miombo woodland bird communities?
… It tested effect of distance from the mine, habitat structure and woodland protection on total avian species richness and the species richness of frugivores, granivores, insectivores, woodland and open habitat specialists, breeding and non-breeding species and Zambezian endemics. The results …
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The influence of woodlot size and location in suburban and rural matrices on bird species richness and individual abundance
… larger woodlots. Tufted Titmouse may exploit the habitat structure of smaller woodlots in fragmented landscapes to increase access to foraging habitat. Conservation strategies that reduce fragmentation and promote greater habitat diversity may lead to greater bird species diversity and …
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Asynchrony in the dynamics of chironomids across six locations in northeastern Iceland
… processes, which may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage …
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Microhabitats de uma comunidade de pequenos mamíferos na restinga de Barra de Maricá, RJ
This study examines microhabitat configurations for a small mammal community in a "restinga" in Barra de Maricá, Rio de Janeiro's state. Habitat structure data were taken from the immediate vicinity of capture sites of the following species: Philander opossum, Akodon sp. do group cursor, Proechimys …
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Effects of Habitat Quality on Reproduction in Two Georgia Populations of Gopherus Polyphemus
… investment by examining variation in the habitat structure and reproductive parameters for two populations of Gopherus polyphemus in Southeast GA. Both habitat structure and reproductive parameters for these populations are known from a previous study, thus this study expands upon the …
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