Chapter

Greater Sage-Grouse Population Dynamics and Probability of Persistence

Edward O. Garton, John W. Connelly, Jon S. Horne, Christian A. Hagen, Ann Moser and Michael A. Schroeder

in Greater Sage-Grouse

Published by University of California Press

Published in print May 2011 | ISBN: 9780520267114
Published online March 2012 | e-ISBN: 9780520948686 | DOI: http://dx.doi.org/10.1525/california/9780520267114.003.0016
Greater Sage-Grouse Population Dynamics and Probability of Persistence

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A study was conducted to analyze Greater Sage-Grouse (Centrocercus urophasianus) populations throughout the species' range by accumulating and estimating counts of males at 9,870 leks identified since 1965. A substantial number of leks are censused each year throughout North America providing a combined total of 75,598 counts through 2007, with many leks having more than thirty years of information. These data sets represent the only long-term database available for Greater Sage-Grouse. The study covered thirty Greater Sage-Grouse populations and all leks surveyed in seven Sage-Grouse Management Zones (SMZs) identified in the Greater Sage-Grouse Comprehensive Conservation Strategy. Model forecasts suggest significant population declines; at least 13% of the populations but none of the SMZs may decline below effective population sizes of fifty within the next three decades, while at least 75% of the populations and 29% of the SMZs are likely to decline below effective population sizes of 500 within 100 years if current conditions and trends persist.

Keywords: Sage-Grouse Management Zones; Greater Sage-Grouse; Centrocercus urophasianus; leks; population sizes; population declines

Chapter.  37337 words.  Illustrated.

Subjects: Vertebrates

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