Výsledky vyhledávání - "Michael W. Gratson"

Influence of Predator Harvest, Biological Factors, and Landscape on Elk Calf Survival in Idaho

Autor: Craig White, Michael W. Gratson, Peter Zager

Publikováno v: Journal of Wildlife Management. 74:355-369

We evaluated survival of elk (Cervus elaphus) calves on 2 contrasting study areas in north-central Idaho, USA, from 1997 to 2004. Recruitment was modest (>30 calves:100 F [calves of either sex:F elk ≥1 yr old]) and stable on the South Fork study ar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1a96486c2206305f09758bcfcddb04b9
https://doi.org/10.2193/2007-506

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Male Dominance and Copulation Disruption Do Not Explain Variance in Male Mating Success On Sharp-Tailed Grouse (Tympanuchus Phasianellus) Leks

Autor: Arthur T. Bergerud, Gretchen K. Gratson, Michael W. Gratson

Publikováno v: Behaviour. 118:187-213

This study tested two hypotheses: that male-male competition and dominance relationships among males, rather than female choice of mates, principally determined the extreme variance in male mating success at sharp-tailed grouse leks; and, that male-m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a43c50f30fac63abcb7ea842439fd0f
https://doi.org/10.1163/156853991x00283

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The Inherent Aggravation of Aggregation: An Example with Elk Aerial Survey Data

Autor: Kang-Tsung Chang, Peter Zager, J. Michael Scott, Edward O. Garton, Leona K. Svancara, Michael W. Gratson

Publikováno v: The Journal of Wildlife Management. 66:776

One of the primary challenges in spatial analysis is the sensitivity of statistical results to the definition of spatial units over which data are collected. In the geographical literature, this sensitivity is known as the modifiable areal unit probl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00b6dd0273b3fd5b5f3d2137ad9128aa
https://doi.org/10.2307/3803142

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Nutritional Condition Models for Elk: Which Are the Most Sensitive, Accurate, and Precise?

Autor: Dennis L. Murray, Bruce K. Johnson, John G. Cook, Rachel C. Cook, Peter Zager, Michael W. Gratson

Publikováno v: The Journal of Wildlife Management. 65:988

Traditionally, biologists have developed indices that assess nutrition and condition of wild ungulates. However, many attempts to validate such indices have failed to indicate the range of conditions under which they work. Furthermore, such validatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e30c04f3f27a8ab1251c19ef7c205d35
https://doi.org/10.2307/3803047

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Development of Predictive Models of Nutritional Condition for Rocky Mountain Elk

Autor: Michael W. Gratson, Rachel C. Cook, Dennis L. Murray, John G. Cook, Bruce K. Johnson, Peter Zager

Publikováno v: The Journal of Wildlife Management. 65:973

Despite its preeminence as a game species in North America, little research exists to validate nutritional condition indices for Rocky Mountain elk (Cervus elaphus nelsonii). We developed and calibrated indices of nutritional condition for live and d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67ab2e8d7978cc68faf6e13f8da908e1
https://doi.org/10.2307/3803046

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Sexual Selection for Increased Male Courtship and Acoustic Signals and against Large Male Size at Sharp-Tailed Grouse Leks

Autor: Michael W. Gratson

Publikováno v: Evolution. 47:691

Sexual dimorphism has been a long-standing problem for evolutionary biology (Darwin, 1871; Selander, 1966, 1972; Ralls, 1977; Alexander et al., 1979; Slatkin, 1984; Bradbury and Andersson, 1987). It is generally thought that sexual selection is the m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13b73da564fdff4b94bd5514eb9a70db
https://doi.org/10.2307/2410083

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