Reduced population size can induce quick evolution of inbreeding depression in the invasive ladybird Harmonia axyridis

文献类型： 外文期刊

第一作者： Laugier, Guillaume J. M.

作者： Laugier, Guillaume J. M.;Tayeh, Ashraf;Soldati, Laurent;Serrate, Bruno;Estoup, Arnaud;Facon, Benoit;Laugier, Guillaume J. M.;Le Moguedec, Gilles;Su, Wang

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关键词： Inbreeding depression;Bottleneck;Purging;Fixation;Harmonia axyridis

期刊名称：BIOLOGICAL INVASIONS （ 影响因子：3.133； 五年影响因子：3.694 ）

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收录情况： SCI

摘要： Understanding biological invasion is currently one of the main scientific challenges for ecologists. The introduction process is crucial for the success of an invasion, especially when it involves a demographic bottleneck. A small introduced population is expected to face a higher risk of extinction before the first stage of invasion is complete if inbreeding depression, caused by the expression of deleterious alleles, is important. Changes in mating regimes or in population size can induce the evolution of deleterious allele frequencies, either by selection or by drift, possibly resulting in the purging or the fixation of such alleles within the population. The harlequin ladybird Harmonia axyridis became invasive on several continents following a scenario including at least one event of demographic bottleneck. Although native populations suffered from severe inbreeding depression, it was greatly reduced in invasive ones suggesting that deleterious alleles were purged during the invasion process. In this study, we performed an experiment designed to manipulate the effective population size of H. axyridis across successive generations to mimic contrasting introduction events. We used the measurement of two fitness-related phenotypic traits in order to test (1) if inbreeding depression can evolve at the time-scale of an invasion; and (2) if the changes in inbreeding depression following a bottleneck in laboratory conditions are compatible with the purging of deleterious alleles observed in this species. We found that two generations of very low population size are enough to induce a substantial change in inbreeding depression. Although the genetic changes mostly consisted in fixation of deleterious alleles, purging did also occur, sometimes simultaneously with fixation.

分类号： Q14

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