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 64 for “"habitat preference"”.
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Geomorphic Assessment and Flow Modeling of Pearl Darter (Percina aurora) Habitat in the Pascagoula River Watershed
… is important to understanding resident species habitat. Geomorphology is a known, but often neglected factor in habitat assessment for freshwater fishes. A crucial feature commonly seen in alluvial stream systems are sandbars, which are dynamic and variable sediment structures that are known to …
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Spatial ecology of the smooth softshell turtle (Apalone mutica) in the Kaskaskia River of Illinois
… including movement rates, home range size, and habitat preference. Spatial ecological information is lacking for many river turtles including the Smooth Softshell Turtle (Apalone mutica), a species inhabiting the Midwestern United States. I investigated the spatial ecology of A. mutica in two …
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Winter/Spring Population Characteristics of White-Tailed Deer in an Agricultural/Wetland Complex in Northeastern South Dakota
<p>Habitat preference, cover characteristics of corn, movements, and sexual segregation patterns of white-tailed deer (Odocoileus virginianus) were evaluated at Sand Lake National Wildlife Refuge (SLNWR) in winter (January - March) and spring (April - June), 1993 and 1994. An average of 20 …
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Selection of benthic habitat by yellow-phase American eels (Anguilla rostrata)
This thesis examines habitat preference of yellow-phase American eels (Anguilla rostrata) and relationships between age and length with that preference. The thesis is comprised of two chapters: (1) an introduction and literature review on American eel life history, their habitat selection, and the …
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The biology, ecology and population trends of jacopever Helicolenus dactylopterus in South Africa
… response to fishing pressure. The life history, habitat preference and population trends of the species in South Africa were thus investigated. The age, growth, reproductive characteristics and diet were examined from 719 specimens collected from west and south coast trawls. The maximum age …
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The role of life-histories in colonising a novel environment
… arise when ancestral populations colonise a new habitat and/or begin to utilise a novel resource. Savannah grasslands represented a novel niche during the Miocene and their colonisation from ancestral forests has resulted in rapid diversification of numerous plants, invertebrates and vertebrates. …
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Early hominid habitat preferences in East Africa: Stable isotopic evidence from paleosols
… understand early hominid land-use patterns and habitat preference, the synchronic variation of hominid activity preserved in archaeological sites is examined in a diversity of floral microhabitats across two Early Pleistocene landscapes. In collaboration with landscape archaeology projects at …
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A Comparison of Eastern Gray Squirrel (Sciurus Carolinensis) Nesting Behavior among Habitats Differing in Anthropogenic Disturbance
… squirrels inhabit a large range of heterogeneous habitats and climates, and live with various levels of anthropogenic disturbance. Previous studies have examined this species in unmodified and modified surroundings; however, a comparison of populations between these habitats has yet to be …
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Evolution of the Jaw Apparatus in Pythons
… (2) these differences broadly correspond with habitat preference (arboreal, semiarboreal, terrestrial). Arboreal/semiarboreal species have an elongate braincase that is widened anteriorly, and elongate quadrates and pterygoid bones, traits most pronounced in the most arboreal species, Morelia …
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Life History of the Ozark Minnow, Dionda Nubila
Habitat preference, age and growth, sex ratio, reproduction, fecundity, length-weight relationships, and associated species of the Ozark minnow, Dionda nubila (Forbes), were studied. Monthly samples from the James River in Greene County, Missouri, were taken from July 22, 1976 through September 23, …
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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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Restoration of Red Spruce (Picea rubens) and Virginia Northern Flying Squirrel (Glaucomys sabrinus fuscus) Habitat in West Virginia
… of West Virginia and Virginia. Existing habitat suitability models emphasize the composition of the red spruce canopy but lack insights into the structural characteristics of the forest that are critical for VNFS occupancy. I examined VNFS habitat preference through previous survey …
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The echinoid Parechinus angulosus and its association with other invertebrates
… South Africa. Samples were collected on each habitat type by placing a bottle over the substrate and scraping the sample into the bottle. The organisms in each sample were identified under a microscope and counted. The available habitat at each site was survey by divers swimming 6 am transects …
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A Scent-Station Survey of Medium-Size Mammals on the Callaway Preserve, Harris County, Georgia
… scent- station technique, to determine species preference in regard to habitat, to compare relative abundance of species in regard to habitat, and to compare habitats in terms of the species present. Thirty-six scent-stations were established on the property and monitored to observe the presence …
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Intraspecific and Interspecific Agonistic Behavior in Chipmunks, TAMIAS MERRIAMI, T. OBSCURUS, and T. SPECIOSUS (Rodentia: Sciuridae)
… of these chipmunks is not due merely to habitat preference, because of the overlap of habitats where T. merriami and T. obscurus lived isolated from other species of chipmunks; but rather that aggressive interactions, selected for by both species to protect scarce food supplies, serve to …
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Seasonal and lunar patterns of peach blossom jellyfish (Craspedacusta sowerbii) in Michigan
… suggesting overlapping dispersal pathways or habitat preference. The ecological niche model showed fair predictive ability and identified high habitat suitability in the southern lower peninsula, with winter climate exerting the greatest influence on predicted distribution. The unpredictable …
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
… parts of the world, wrack transported from one habitat to a second habitat can be considered as a "spatial subsidy" for the recipient habitat with significant consequences for community dynamics and food webs. The primary aim of this study was to determine the significance of the different …
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The decline of the globally threatened Rudd's Lark in one of its last remaining core sites, the Wakkerstroom grasslands
… predicts a dramatic reduction in its available habitat, places the species firmly in the cross-hairs of extinction risk. This thesis aims to gain a better understanding of Rudd's Lark population trends, habitat preference and threats in one of its most important remaining core sites in the …
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On the midwater fish faunas of Gulf Stream rings with respect to habitat differences between slope water and northern Sargasso Sea
… and Northern Sargasso Sea are used to assign habitat preferences. Species clusters derived from an ordination using correspondence ana1ysis agree well with the habitat preference groups. The assemblage of species in the rings occupies the middle of a gradient in faunal composition from winter …
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Habit Preferences and Fidelity in the Cotesia Flavipes Complex (Hymenoptera: Braconidae): Current Preferences and the Potential for Change Through Learning and Selection
… non-target hosts. Here I suggest that testing habitat preference can help predict host ranges of insect parasitoids, and I present the results from tests of three congeneric braconid parasitoids in the Cotesia flavipes complex. These wasps parasitize stemboring larvae (Lepidoptera: Pyralidae & …
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