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 19 of 19 for “"leks"”.
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Greater Sage Grouse on the Edge of Their Range: Leks and Surrounding Landscapes in the Dakotas
… and historically active greater sage grouse leks in North Dakota and South Dakota was studied during 2001 and 2002 in an attempt to find reasons for desertion of once thriving leks and for apparent population declines. I collected information on current and historic (i.e., leks with 0-years) …
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Greater Sage-Grouse Response to Coal-Bed Natural Gas Development and West Nile Virus in the Powder River Basin, Montana and Wyoming, USA
… displaying males and the status of sage-grouse leks. Second, I used rates of WNv-induced mortality and seroprevalence from radio-marked birds to estimate rates of WNv infection. Third, I studied the influence of female characteristics, season, and environmental variables on nest, brood, and …
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Greater Sage-Grouse Response to Coal-Bed Natural Gas Development and West Nile Virus in the Powder River Basin, Montana and Wyoming, USA
… displaying males and the status of sage-grouse leks. Second, I used rates of WNv-induced mortality and seroprevalence from radio-marked birds to estimate rates of WNv infection. Third, I studied the influence of female characteristics, season, and environmental variables on nest, brood, and …
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Lek ecology of male greater sage-grouse in Carbon County, Wyoming
… season, such as how frequently males visit their leks or move among leks, could relate to a male sage-grouse�s ability to establish dominance at his lek and mate, so it is important to understand how these behaviors may change with environmental conditions. Additionally, some males are not seen by …
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Distribution and Landscape Attributes of Greater Prairie Chickens and Sharp-Tailed Grouse Outside of Their Traditional Range in South Dakota
… landscape attributes within 3,000 m of leks, and analyzes landscape characteristics using GIS modeling to develop a predictive model. Survey routes were developed in areas of potential suitable habitat and were sampled beginning ½ hour before sunrise and ending 2 to 2½ hours after …
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Sharp-Tailed Grouse (Tympanuchus phasianellus) Habitat Selection and Population Trends in Saskatchewan
… of the sharp-tailed grouse in Saskatchewan. Leks, communal dancing grounds, form the basis for much of the life history knowledge of sharp-tailed grouse and are often used in the management of the species. Correspondingly, the probability of lek occurrence is an excellent indicator of habitat …
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SAGE-GROUSE AND THE HUMAN FOOTPRINT: IMPLICATIONS FOR CONSERVATION OF SMALL AND DECLINING POPULATIONS
… Saskatchewan, Canada. A regional analysis of leks (e.g., communal breeding sites) documented that populations impacted by the increasing extent of agricultural tillage, roads, and energy development out to spatial scales larger than previously known. Using bird abundance as a novel way to …
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SAGE-GROUSE AND THE HUMAN FOOTPRINT: IMPLICATIONS FOR CONSERVATION OF SMALL AND DECLINING POPULATIONS
… Saskatchewan, Canada. A regional analysis of leks (e.g., communal breeding sites) documented that populations impacted by the increasing extent of agricultural tillage, roads, and energy development out to spatial scales larger than previously known. Using bird abundance as a novel way to …
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SAGE-GROUSE AND ENERGY DEVELOPMENT: INTEGRATING SCIENCE WITH CONSERVATION PLANNING TO REDUCE IMPACTS
… at 3, 5 and 10-km scales surrounded active leks versus random locations. Spatially explicit nesting and wintering models predicted independent sage-grouse locations (validation R2 ≥ 0.98). I incorporated knowledge of energy impacts into a study design that tested for threshold …
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SAGE-GROUSE AND ENERGY DEVELOPMENT: INTEGRATING SCIENCE WITH CONSERVATION PLANNING TO REDUCE IMPACTS
… at 3, 5 and 10-km scales surrounded active leks versus random locations. Spatially explicit nesting and wintering models predicted independent sage-grouse locations (validation R2 ≥ 0.98). I incorporated knowledge of energy impacts into a study design that tested for threshold …
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Impacts of Oil and Gas Development on Sharp-Tailed Grouse on the Little Missouri National Grasslands, North Dakota
… focus their management actions on the remaining leks within the oil field, particularly on the surrounding habitats where the current oil and gas development is expanding into. The leks are the focal poin for annual reproduction and movements of the remaining grouse and if these habitats are …
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Use and Survival of Greater Sage-Grouse in Meadows Managed for Non-Native Ungulate Grazing in Nevada
… a trapping protocol, traditionally performed at leks, but instead captured brooding and non-brooding hens at late brood-rearing habitat. I integrated distance sampling methods to simultaneously obtain data for estimating local population abundance and survival.In chapter 1, I used single-variate …
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Greater Sage-grouse habitat and demographic response to grazing by non-native ungulates
… data on the species' ability to travel from leks (breeding sites) with data on habitat selection at the landscape scale. I monitored 279 individual females with broods captured from 24 leks in the Northern Great Basin. For these 24 leks, I classified the habitat into unsuitable, low, …
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Influence of the Conservation Reserve Program and Landscape Composition on the Spatial Demographics of Prairie Grouse in Northeastern South Dakota
… U.S.A., during 2007 and 2008. I searched for leks in three, 10000-ha study areas with dissimilar landscape compositions including varying influence of the CRP grasslands and agriculture intensity. I defined and digitized the entire landscape in the study areas into nine general land use …
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Patterns and process during the diversification of the cichlid fishes in Lake Malawi, Africa
… bower morphologies, and that exist in discrete leks separated by only 1-2m of depth, are divergent in both sexually selected and ecological traits. These phylogenies suggest that the forces of sexual and ecological selection have been intertwined during the speciation of these groups.</p>
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Sexual selection and biological diversification: Patterns and processes
… animal mating systems including mate guarding, leks, "harems", monogamy, polygyny, and pair-bonding in humans.
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Ecology, conservation and management of the black lechwe (Kobus leche smithemani) in the Bangweulu Basin, Zambia
… few dominant males, which may be likened to leks formed by some other antelopes. The population of lechwe is currently maintained around 30,000. The sex ratio of the species is equal to unity and the age ratio was estimated at 3 : 1. The entire Bangweulu wetlands can sustain a population of …
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The ecology of translocated greater sage-grouse in Strawberry Valley, Utah
… we trapped grouse during the spring on and near leks of source populations. We placed each female in a cardboard box and translocated them overnight to the Strawberry Valley. Each female was fitted with a radio-transmitter and released near the lek where males were actively strutting. We …
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Ecology of Greater Sage-Grouse in the Dakotas
… spring migration coincided with abandonment of leks by males and age of chicks (i.e., 3-4 weeks) for females. Timing of migration from summer to winter and winter to breeding ranges was less obvious, as movements were gradual and occurred over several months. Survival of migratory sage-grouse …