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Mechanistic and experimental analysis of condition and reproduction in a polymorphic lizard

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Author

Summary, in English

The importance of genetic and environmental variation in condition in shaping evolutionary trade-offs have recently been subject to much theoretical discussion, but is very difficult to investigate empirically in most field-based systems. We present the results from mechanistic experimental manipulations of reproductive investment and condition in two female colour morphs (orange and yellow) of side-blotched lizards (Uta stansburiana). We investigated the interactions between throat colour morphs, condition, local social environment and female survival using path-analysis. Using follice-ablation experiments, we show that large clutch size has a negative effect on field survival among yellow females, and that this effect is partly mediated by immunosuppressive effects of large clutches. In orange females these effects were less pronounced, and there was a negative survival effect of strong antibody responses. Hence, we experimentally confirmed our previous findings of correlational selection between female morphotype and immunocompetence, an important condition trait. Manipulation of corticosterone revealed multiple (pleiotropic) direct and indirect effects of this hormone on both condition and reproductive traits. We argue that interaction effects (e.g. between local environments and genotypes) could explain a substantial fraction of variation in condition and reproduction in natural populations. Increased attention to such interaction effects and their fitness consequences will provide novel insights in field studies of selection and reproductive allocation.

Publishing year

2002

Language

English

Pages

1034-1047

Publication/Series

Journal of evolutionary biology

Volume

15

Issue

6

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Biological Sciences

Status

Published

Research group

  • Evolution and Ecology of Phenotypes in Nature

ISBN/ISSN/Other

  • ISSN: 1420-9101