La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Genetic quality of individuals impacts population dynamics
Auteurs :	D. H. Reed, Auteur ; A. C. Nicholas, Auteur ; G. E. Stratton, Auteur
Type de document :	Article
Dans :	Animal Conservation (10(3) AUG 2007)
Article en page(s) :	275-283
Résumé :	Ample evidence exists that an increase in the inbreeding level of a population reduces the value of fitness components such as fecundity and survival. It does not follow, however, that these decreases in the components of fitness impact population dynamics in a way that increases extinction risk, because virtually all species produce far more offspring than can actually survive. We analyzed the effects of the genetic quality (mean fitness) of individuals on the population growth rate of seven natural populations in each of two species of wolf spider in the genus Rabidosa, statistically controlling for environmental factors. We show that populations of different sizes, and different inbreeding levels, differ in population dynamics for both species. Differences in population growth rates are especially pronounced during stressful environmental conditions (low food availability) and the stressful environment affects smaller populations (

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