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Parasitism reduces the potential for evolution in a wild bird population
Anne Charmantier1, Loeske E B Kruuk, Marcel M Lambrechts
1Centre d'Ecologie Fonctionnelle and Evolutive, Centre National de la Recherche Scientifique, 1919 Route de Mende, F-34293 Montpellier Cedex 5, France. charmantier@cefe.cnrs-mop.fr
Evolution; International Journal of Organic Evolution
|April 3, 2004
Summary
Parasitism significantly reduced the heritability of chick body size in blue tits (Parus caeruleus). Removing parasites increased heritability, showing environmental conditions impact genetic trait evolution.
Area of Science:
- Evolutionary biology
- Quantitative genetics
- Ecology
Background:
- Parasitism can impose significant environmental stress on hosts.
- Understanding how environmental factors influence heritability is crucial for evolutionary studies.
- Wild bird populations offer valuable insights into host-parasite dynamics.
Purpose of the Study:
- To investigate the effect of detrimental environmental conditions, specifically parasitism, on the heritability of chick body size.
- To determine if parasitism constrains the evolutionary response to selection in blue tits (Parus caeruleus).
Main Methods:
- Conducted a nine-year study on a wild blue tit population.
- Experimentally deparasitized broods while maintaining control (parasitized) broods.
- Measured tarsus length as an indicator of body size.
Main Results:
- Heritability of tarsus length was significantly higher in deparasitized broods compared to control broods.
- A lower common brood environment effect was observed in deparasitized broods.
- Evidence of significant genotype-by-environment interactions was found, indicating ecological conditions affect additive genetic effects.
Conclusions:
- Parasitism negatively impacts the heritability of host traits, such as body size.
- Parasitism can constrain the evolutionary potential of host populations by influencing the expression of genetic variation.
- This study provides novel evidence for the influence of parasitism on host quantitative genetics and its potential to limit evolutionary adaptation.