Local adaptation to biotic interactions: a meta-analysis

Partie de:
vendredi 20 déc. 03:10 PM (15 minutes)
Salle EFG

Local adaptation to broad-scale environmental heterogeneity can increase species’ geographic distributions and rates of diversification, but which environmental components commonly drive local adaptation—particularly the importance of biotic interactions—is unclear. Biotic interactions should drive local adaptation when they impose consistent divergent selection; if this is common we expect transplant experiments to detect more frequent and stronger local adaptation when biotic interactions are left intact. We tested this hypothesis using a meta-analysis of transplant experiments from >125 studies (mostly on plants). Overall, local adaptation was common and biotic interactions affected fitness. Nevertheless, local adaptation was neither more common nor stronger when biotic interactions were left intact, either between experimental treatments within studies (control vs. biotic interactions experimentally manipulated) or between studies that used natural vs. biotically-altered transplant environments. However, the effect of ameliorating negative interactions differed among latitudinal zones, suggesting that interactions may promote local adaptation more often in tropical vs. temperate ecosystems, though few tropical studies were available to test this. Our results suggest that biotic interactions often fail to drive local adaptation even though they affect fitness, perhaps because temperate biotic environments are unpredictable at the spatiotemporal scales required for local adaptation.


Mon horaire

Ajouter à Mon Horaire comme Favoris