Heterosis and inbreeding depression in bottlenecked populations: a test in the hermaphroditic freshwater snail Lymnaea stagnalis - Archive ouverte HAL
Article Dans Une Revue Journal of Evolutionary Biology Année : 2011

Heterosis and inbreeding depression in bottlenecked populations: a test in the hermaphroditic freshwater snail Lymnaea stagnalis

Résumé

Small population size is expected to induce heterosis, due to the random fixation and accumulation of mildly deleterious mutations, whereas within-population inbreeding depression should decrease due to increased homozygosity. Population bottlenecks, although less effective, may have similar consequences. We tested this hypothesis in the self-fertile freshwater snail Lymnaea stagnalis, by subjecting experimental populations to a single bottleneck of varied magnitude. Although patterns were not strong, heterosis was significant in the most severely bottlenecked populations, under stressful conditions. This was mainly due to hatching rate, suggesting that early acting and highly deleterious alleles were involved. Although L. stagnalis is a preferential outcrosser, inbreeding depression was very low and showed no clear relationship with bottleneck size. In the less reduced populations, inbreeding depression for hatching success increased under high inbreeding. This may be consi! stent with the occurence of synergistic epistasis between fitness loci, which may contribute to favour outcrossing in L. stagnalis.

Dates et versions

hal-01453853 , version 1 (02-02-2017)

Identifiants

Citer

Marie-Agnès Coutellec, Thierry Caquet. Heterosis and inbreeding depression in bottlenecked populations: a test in the hermaphroditic freshwater snail Lymnaea stagnalis. Journal of Evolutionary Biology, 2011, 24 (10), pp.2248-2257. ⟨10.1111/j.1420-9101.2011.02355.x⟩. ⟨hal-01453853⟩

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