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 24 for “"Micro-habitat"”.
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Ruffed grouse natality, chick survival, and brood micro-habitat selection in the southern Appalachians
… may be improved in upcoming years. I compared micro-habitat characteristics at known brood locations with randomly selected locations to determine which characteristics are selected by ruffed grouse hens and broods in the southern Appalachians. In the first half of the brood season (weeks 1-6) …
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The function of passive debris cloaking in tiny beetles (Coleoptera: Zopheridae)
… the relationship between flight loss, micro-habitat and diversification within the family, I used phylogenetic methodologies. I ran a correlated evolution analysis between wing state and micro-habitat type on a zopherid phylogeny, and assessed the effects of flight loss on Zopheridae …
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Habitat Selection By Female White-Tailed Deer in the Northern Black Hills, South Dakota and Wyoming
Habitat selection patterns of white-tailed deer (Odocoileus virginianus dacotensis) in the northern Black Hills were evaluated at the macro- and micro-habitat level of resolution during winter (January - April) and spring (May - June) 1990 and 1991. During winter, deer selected agricultural lands …
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Iron and the ecology of marine microbes
… for life. In the marine environment, this micronutrient is a scarce resource that limits processes of global importance such as photosynthesis and nitrogen fixation. Given that marine microorganisms play a central role in modulating such biogeochemical cycles, understanding how their …
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Facilitation of Yucca brevifolia recruitment by Mojave Desert shrubs
… The research indicates there is strong micro-habitat specificity for Yucca brevifolia recruitment under the canopy of nurse plants. These data also suggest that the local presence of specific perennial shrubs resulted in higher levels of recruitment causing a distinct pattern of …
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Field evaluation of the northern bobwhite habitat suitability index model with implications for the conservation reserve program
… of the northern bobwhite (Colinus virginianus) Habitat Suitability Index (HSI) model was conducted using habitat and relative abundance data from 121 sites distributed throughout Halifax County, Virginia, 1986-1991. Model output and the index of relative abundance were only poorly correlated …
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POPULATION DYNAMICS OF SPECIES RECOVERY: MULTISCALE DEMOGRAPHY IN RESTORED HABITATS
With habitat loss remaining one of the greatest global threats to biodiversity, habitat restoration has become an important tool for species recovery and conservation. Yet despite the conceptually-appealing lens of “if you build it, they will come” (i.e., the ‘Field of Dreams’ Hypothesis), …
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Microhabitat Affinity of Blanchard's Cricket Frog (Acris crepitans blanchardi) in Rural and Urban Areas in Central Texas
Habitats of small anurans are being encroached upon by land development in central Texas. Blanchard’s cricket frog (Acris crepitans blanchardi) is a small frog occupying small streams in these areas of disturbance. I investigated microhabitat affinity of Blanchard’s cricket frog to assess whether …
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Spatial, Dietary, and Temporal Niche Parameters of Two Species of Box Turtle (Terrapene) in Microsympatry
… from two sites where both species are found in microsympatry: Penn-Sylvania Prairie, Dade County, and Osage Prairie, Vernon County, Missouri. A total of 203 turtles were collected on both prairies between April 1992 and October 1993. Species ratios were (T. carolina: T. ornata) 3.2: 1 on …
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Habitat and Imperilment of the Candy Darter <i>Etheostoma osburni</i> in the New River Drainage, USA
… two complementary studies to investigate the habitat associations of an imperiled highland stream fish, the Candy Darter Etheostoma osburni. In Chapter 2, I asked (1) does micro-habitat suitability correlate with the "robustness" (i.e., viability) of four distinct populations? In Chapter 3, I …
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UNDERSTANDING THE INFLUENCE OF ANTHROPOGENIC HABITAT MODIFICATION ON URBAN ANIMALS: CASE STUDIES OF CARRIBEAN LIZARDS AND NORTH AMERICAN MAMMALS
… urbanization is rapidly expanding, leading to habitat degradation and fragmentation, which present strong challenges for native wildlife. At the same time, urbanization is often accompanied by the introduction of non-native species, which alter community and habitat structures. These changes …
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Ecological Factors Associated With Songbird and Small Mammal Predation by Texas Ratsnakes
… to monitor Texas ratsnake (Elaphe obsoleta ) habitat use and behavior to examine predation risk on nests of two endangered bird species breeding at Fort Hood, Texas. In addition, a drought occurred which allowed me to examine effects of fluctuating prey abundance on ratsnake condition and …
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Anura of Eastern South Dakota: Their Distribution and Characteristics of Their Wetland Habitats, 1997-1998
… seasonal and semipermanent wetlands provided habitat for the largest proportion of all anuran species except the wood frog, and to a lesser degree the Canadian toad, both of which were mainly found in permanent wetlands. Wetlands within all vegetative cover categories provided habitat for the …
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Freshwater Mussels Vary in Substrate Preference and Mobility in Pairwise Behavioral Experiments
… have broad sediment tolerances, some species are micro-habitat specialists. Mussel mobility can vary between species, but few studies have tested this consistently under controlled conditions. The objective of this thesis was to use pair-wise substrate choice experiments to examine whether mussel …
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Survival, Movements, and Habitat Use of Mallard Broods Produced on Overwater Nesting Structures in Eastern South Dakota
Survival, movements, and habitat use of mallard (Anas platyrhynchos) broods produced from overwater nesting structures in eastern South Dakota were evaluated during spring and summer 1998-99. Two study sites with overwater nesting structures were chosen in 1998, representing a large semipermanent …
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Seasonal changes in the foraging methods and habitats of six sympatric woodpecker species in southwestern Virginia
Foraging methods and habitats used by downy, hairy, pileated, red-bellied, and red-headed woodpeckers, and common flickers were studied in southwestern Virginia during the breeding season, post-breeding season, and winter. The food resource used by the six species was partitioned by species' use of …
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Pre- to post-fledging carryover effects and the post-fledging ecology of the Dickcissel (Spiza americana)
… effects of nestling traits and fledgling habitat use. Specifically, I sought to address the following questions: (1) Do body condition and wing development at fledging predict juvenile survival during the post-fledging period? (2) What is the relative influence of body condition and wing …
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Plant ecology of the Namaqualand Strandveld : community structure and dynamics in a winter-rainfall desert
… and general physical benefits associated with micro-habitat modification and mutual protection. Aspects of this postulate were tested with a combination of manipulative and sampling experiments. The results from a removal experiment suggested that interactions between individuals and their …
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Habitat Selection of White-tailed and Mule Deer in the Southern Black Hills, South Dakota
… 1970's. This decline is believed to be due to habitat deterioration. Most habitats in the Black Hills are becoming ponderosa pinedominated climax communities. Such pine communities will not support as many deer as early successional vegetative stages. To better understand the declining …
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Spatial ecology, habitat use, genetic diversity, and reproductive success: measures of connectivity of a sympatric freshwater turtle assemblage in a fragmented landscape
Habitat fragmentation can have serious conservation implications for long-lived species such as freshwater turtles. Using integrative radio-telemetry and molecular methods, I examined characteristics in five species of turtles that should influence connectivity and long-term persistence of …
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