Spelling suggestions: "subject:"wildlife conservation."" "subject:"wildlifes conservation.""
21 |
Evolutionary and ecological causes and consequences of trophic niche variation in ursidsRaper Lafferty, Diana Jean 05 September 2015 (has links)
<p> Individual variation and fitness are the cornerstones of evolution by natural selection. The trophic niche represents an important source of phenotypic variation on which natural selection can act. Although individual variation is fundamental to species-level ecological and evolutionary change, individual variation is often ignored in population-level approaches to wildlife ecology, conservation and management. Failing to link individual resource use to fitness or to biological outcomes related to fitness limits us to managing for the average resource needs of a population, which may be insufficient for protecting the diversity of resource use within populations and the underlying eco-evolutionary processes that generate that diversity. My goals were to provide insights into the mechanisms that generate and constrain intrapopulation trophic niche variation, evaluate whether linkages exist between individual biological outcomes and variation in food habits across the range of resources consumed within generalist consumer populations and examine how that variation manifests in population-level responses. </p><p> I investigated the causes and physiological consequences of intrapopulation trophic niche variation in two generalist consumers, the American black bear (<i>Ursus americanus</i>) and brown bear (<i>U. arctos</i>) across three sites in British Columbia, CAN and at one site in Alaska, USA. My primary tools included stable isotope analysis to estimate diet, enzyme-linked immunoassay of hair to quantify the hormone cortisol for indexing physiological stress, and genetic analyses to identify individuals, species, and sex and to estimate ancestry. I found that individual differences in resource use can result in similar biological outcomes and that similar resource use can result in different biological outcomes. Intra- and interspecific competition, sex-based differences in nutritional and social constraints and annual variation in food availability all influenced trophic niche variation and the resultant biological outcomes. I also found evidence of a link between intrapopulation trophic niche variation and population genetic structure. My results highlight the diverse ecological drivers and diverse consequences of trophic niche variation, which further illuminates why the trophic niche is a nexus for eco-evolutionary dynamics.</p>
|
22 |
The role of the threadfin shad, Dorosoma petenense, in the food web of a small, new impoundmentGerdes, John Henry, 1932- January 1961 (has links)
No description available.
|
23 |
Conservation of the African forest elephant (Loxodonta africana) in the Lobeke, south-east CameroonEkobo, Atanga January 1995 (has links)
No description available.
|
24 |
An economic measure of nonconsumptive wildlife values implications for policy analysis /Richards, Merton Taylor. January 1980 (has links) (PDF)
Thesis (Ph. D. - Renewable Natural Resources)--University of Arizona, 1980. / Includes bibliographical references.
|
25 |
Conservation studies of amphibian health at individual, population and landscape scales /Homan, Rebecca Newcomb. January 2003 (has links)
Thesis (Ph.D.)--Tufts University, 2003. / Director: J. Michael Reed. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 97-114). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
|
26 |
The conservation of threatened species in South Australia /Webb, Trevor John. January 1991 (has links) (PDF)
Thesis (M. Env. St.)--University of Adelaide, Mawson Graduate Centre for Environmental Studies, 1991. / Includes bibliographical references (leaves 75-86).
|
27 |
Do pet cats (Felis catus) have an impact on species richness and abundance of native mammals in low-density Western Australian suburbia? /Lilith, Maggie. January 2007 (has links)
Thesis (Ph.D.)--Murdoch University, 2007. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves 237-261.
|
28 |
Conservation of the Irrawaddy dolphin, Orcaella brevirostris (Owen in Gray, 1866) in the Mekong River : biological and social considerations influencing management /Beasley, Isabel L. January 2007 (has links)
Thesis (Ph.D.) - James Cook University, 2007. / Typescript (photocopy) Bibliography: leaves 340-376.
|
29 |
Physical habitat classification for conservation planning in the Klamath Mountains region /Vance-Borland, Kenneth W. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 1999. / Typescript (photocopy). Includes bibliographical references (leaves 61-69). Also available on the World Wide Web.
|
30 |
The place of winter feeding in practical wildlife management ...Gerstell, Richard, January 1942 (has links)
Thesis (Ph. D.)--University of Michigan, 1942. / Cover title. "Literature cited": p. 118-121.
|
Page generated in 0.118 seconds