WHY BREEDING TIME HAS NOT RESPONDED TO SELECTION FOR EARLIER BREEDING IN A SONGBIRD POPULATION

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ID: 295650
2006
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Ranked #135 of 244 articles by views in international journal of systematic and evolutionary microbiology

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Abstract
Abstract A crucial assumption underlying the breeders equation is that selection acts directly on the trait of interest, and not on an unmeasured environmental factor which affects both fitness and the trait. Such an environmentally induced covariance between a trait and fitness has been repeatedly proposed as an explanation for the lack of response to selection on avian breeding time. We tested this hypothesis using a long-term dataset from a Dutch great tit (Parus major) population. Although there was strong selection for earlier breeding in this population, egg-laying dates have changed only marginally over the last decades. Using a so-called animal model, we quantified the additive genetic variance in breeding time and predicted breeding values for females. Subsequently, we compared selection at the phenotypic and genetic levels for two fitness components, fecundity and adult survival. We found no evidence for an environmentally caused covariance between breeding time and fitness or counteracting selection on the different fitness components. Consequently, breeding time should respond to selection but the expected response to selection was too small to be detected.
Reference Key
openalex_W4248190608 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Phillip Gienapp, Erik Postma, Marcel E. Visser
Journal international journal of systematic and evolutionary microbiology
Year 2006
DOI
10.1111/j.0014-3820.2006.tb01872.x
URL
https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/j.0014-3820.2006.tb01872.x
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