Author:
Berzins Lisha L.,Dawson Russell D.,Morrissey Christy A.,Clark Robert G.
Abstract
AbstractAnimal populations are influenced strongly by fluctuations in weather conditions, but long-term fitness costs are rarely explored, especially in short-lived avian species. We evaluated the relative contributions of individual characteristics and environmental conditions to lifetime reproductive success (LRS) of female tree swallows (Tachycineta bicolor) from two populations breeding in contrasting environments and geographies, Saskatchewan and British Columbia, Canada. Female swallows achieved higher LRS by breeding early in the season and producing more fledglings. Other measures of female quality had virtually no influence on LRS. Genetic factors did not predict LRS, as there was no correlation between life-history components for sister pairs nor between mothers and their daughters. Instead, climate variability—indexed by spring pond density (i.e., abundance of wetland basins holding water) during years when females bred—had strong positive effects on female LRS in more arid Saskatchewan but only weak positive effects of moisture conditions were detected in wetter British Columbia. Overall, several life history trait correlates of LRS were similar between populations, but local environmental factors experienced by individuals while breeding produced large differences in LRS. Consequently, variable and extreme environmental conditions associated with changing climate are predicted to influence individual fitness of distinct populations within a species’ range.
Funder
Mathematics of Information Technology and Complex Systems
Natural Sciences and Engineering Research Council of Canada
University of Northern British Columbia
Canada Foundation for Innovation
British Columbia Knowledge Development Fund
Environment and Climate Change Canada
Publisher
Springer Science and Business Media LLC
Cited by
11 articles.
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