101. Survival of Sharp‐Tailed Grouse Under Variable Livestock Grazing Management.
- Author
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Milligan, Megan C., Berkeley, Lorelle I., and M c New, Lance B.
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RANGE management , *GROUSE , *ROTATIONAL grazing , *LIVESTOCK , *LAND use , *ANIMAL populations - Abstract
Livestock grazing is a predominant land use worldwide and can influence wildlife populations by altering grassland composition, structure, and productivity. Conceptually, rest‐rotation livestock grazing could increase pasture‐level heterogeneity that would allow wildlife to balance the need for resources with the risk of predation. Prairie‐grouse (Tympanuchus spp.) are recognized as important indicator species for grassland ecosystems, so identifying management approaches suitable for prairie‐grouse could have implications for other species. We monitored radio‐collared female sharp‐tailed grouse (T. phasianellus) to evaluate the effects of 3 systems of livestock grazing management on the breeding season survival and habitat‐associated mortality risk of adult grouse in the northern mixed‐grass prairie in eastern Montana and western North Dakota, USA, during 2016–2018. Cumulative breeding season survival was 0.65 ± 0.04 (SE) and annual survival varied from 0.28 ± 0.04 to 0.50 ± 0.05. Grazing management did not have a meaningful influence on any aspect of the cumulative breeding season survival of adult female sharp‐tailed grouse, although the seasonal timing of peaks in mortality risk differed among systems. A 10% increase in cropland increased mortality risk of adult female sharp‐tailed grouse by a factor of 1.27. Overall, our results suggest that strategies that preserve economically viable ranching systems in unfragmented grasslands may have greater benefits for sharp‐tailed grouse survival than prescriptive livestock grazing systems. © 2020 The Wildlife Society. Grazing management did not influence any aspect of breeding season survival of female sharp‐tailed grouse. Strategies that preserve economically viable ranching systems in unfragmented grasslands may have the greatest benefits for sharp‐tailed grouse survival. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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