NDLI: Estimates of annual survival, growth, and recruitment of a white-tailed ptarmigan population in Colorado over 43 years

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Estimates of annual survival, growth, and recruitment of a white-tailed ptarmigan population in Colorado over 43 years

Content Provider	Springer Nature Link
Author	Wann, Gregory T. Aldridge, Cameron L. Braun, Clait E.
Copyright Year	2014
Abstract	Long-term datasets for high-elevation species are rare, and considerable uncertainty exists in understanding how high-elevation populations have responded to recent climate warming. We present estimates of demographic vital rates from a 43-year population study of white-tailed ptarmigan (Lagopus leucura), a species endemic to alpine habitats in western North America. We used capture-recapture models to estimate annual rates of apparent survival, population growth, and recruitment for breeding-age ptarmigan, and we fit winter weather covariates to models in an attempt to explain annual variation. There were no trends in survival over the study period but there was strong support for age and sex effects. The average rate of annual growth suggests a relatively stable breeding-age population ( $$ \bar{\lambda } $$ = 1.036), but there was considerable variation between years for both population growth and recruitment rates. Winter weather covariates only explained a small amount of variation in female survival and were not an important predictor of male survival. Cumulative winter precipitation was found to have a quadratic effect on female survival, with survival being highest during years of average precipitation. Cumulative winter precipitation was positively correlated with population growth and recruitment rates, although this covariate only explained a small amount of annual variation in these rates and there was considerable uncertainty among the models tested. Our results provide evidence for an alpine-endemic population that has not experienced extirpation or drastic declines. However, more information is needed to understand risks and vulnerabilities of warming effects on juveniles as our analysis was confined to determination of vital rates for breeding-age birds.
Starting Page	555
Ending Page	567
Page Count	13
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	56
Issue Number	4
e-ISSN	1438390X
Language	English
Publisher	Springer Japan
Publisher Date	2014-09-13
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alpine Colorado Demography Lagopus leucura Weather Ecology Zoology Plant Sciences Evolutionary Biology Behavioural Sciences Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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