Genetic mark–recapture analysis reveals large annual variation in pre-breeding sex ratio of greater sage-grouse
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Abstract
Sex ratio, and the extent to which it varies over time, is an important factor in the demography, management, and conservation of wildlife populations. Greater sage-grouse Centrocercus urophasianus populations in western North America are monitored using counts of males at leks in spring. Population estimates derived from lek-count data typically assume a constant, female-biased sex ratio, yet few rigorous, empirically derived estimates of sex ratio are available to test that assumption. We estimated pre-breeding sex ratio of greater sage-grouse in a peripheral, geographically isolated population in northwestern Colorado during two consecutive winters using closed-population, robust-design, multi-state, genetic mark–recapture models in program MARK. Sex ratio varied markedly between years, with estimates of 3.29 (95% CI: 2.36–4.59) females per male in winter 2012–2013 and 1.54 (95% CI: 1.22–1.95) females per male in winter 2013–2014. Rather than assuming a constant sex ratio, biologists should consider the potential for large annual variation in sex ratio of greater sage-grouse populations when estimating population size or trend from male lek-count data.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Genetic mark–recapture analysis reveals large annual variation in pre-breeding sex ratio of greater sage-grouse |
| Series title | Wildlife Biology |
| DOI | 10.1002/wlb3.01085 |
| Volume | 2023 |
| Issue | 4 |
| Publication Date | May 10, 2023 |
| Year Published | 2023 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Fort Collins Science Center |
| Description | e01085, 10 p. |