Thursday, August 28, 2014

What determines genetic diversity?

Extended data Figure 2

For next week I thought it would be nice to read a recent Nature paper about the determinants of genetic diversity in animals. Various life history traits were associated with the amount of genetic diversity (see figure), but the most important single factor seemed to be fecundity; the more babies you have, the greater your genetic diversity.

Comparative population genomics in animals uncovers the determinants of genetic diversity

J. Romiguier et al. Nature doi:10.1038/nature13685 (currently still in press)

Abstract: Genetic diversity is the amount of variation observed between DNA sequences from distinct individuals of a given species. This pivotal concept of population genetics has implications for species health, domestication, management and conservation. Levels of genetic diversity seem to vary greatly in natural populations and species, but the determinants of this variation, and particularly the relative influences of species biology and ecology versus population history, are still largely mysterious. Here we show that the diversity of a species is predictable, and is determined in the first place by its ecological strategy. We investigated the genome-wide diversity of 76 non-model animal species by sequencing the transcriptome of two to ten individuals in each species. The distribution of genetic diversity between species revealed no detectable influence of geographic range or invasive status but was accurately predicted by key species traits related to parental investment: long-lived or low-fecundity species with brooding ability were genetically less diverse than short-lived or highly fecund ones. Our analysis demonstrates the influence of long-term life-history strategies on species response to short-term environmental perturbations, a result with immediate implications for conservation policies.

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