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Anthropogenic and Natural Determinants of the Population of a Sensitive Species: Sage Grouse in Nevada

Gerrit van Kooten, Alison Eagle and Mark Eiswerth

No 2004-08, Working Papers from University of Victoria, Department of Economics, Resource Economics and Policy Analysis Research Group

Abstract: This paper uses Nevada data to conduct regression analyses of the relationship between sage grouse (Centrocercus urophasianus) population sizes and potential causal factors. This is policy-relevant because of current petitions for listing this species under the Endangered Species Act. A key feature is that, although monitoring of sage grouse has occurred for many decades, data collection methods and level of monitoring effort have not been consistent. To account for this feature we use, as dependent variables, standardized measures such as population counts and harvest (hunting success) per unit of effort. Preliminary findings suggest that such measures have been particularly sensitive to whether or not humans used strychnine for predator control, with normalized measures of grouse populations higher in years when strychnine was employed. Our results also suggest a positive association between the number of cattle on the range and normalized measures of grouse population. This is a controversial finding as some studies suggest a negative impact of cattle grazing on grouse. Our data do not include indications of the timing and precise nature of grazing practices and so should be interpreted with caution.

Keywords: population viability analysis and endangered species; factors affecting decline of sage grouse (search for similar items in EconPapers)
JEL-codes: Q26 Q58 (search for similar items in EconPapers)
Pages: 33 pages
Date: 2004
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https://web.uvic.ca/~repa/publications/REPA%20work ... kingPaper2004-08.pdf Final version, 2004 (application/pdf)

Related works:
Working Paper: ANTHROPOGENIC AND NATURAL DETERMINANTS OF THE POPULATION OF A SENSITIVE SPECIES: SAGE GROUSE IN NEVADA (2004) Downloads
Working Paper: ANTHROPAGENIC AND NATURAL DETERMINANTS OF THE POPULATION OF A SENSITIVE SPECIES: SAGE GROUSE IN NEVADA (2004) Downloads
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