Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK.
National Exposure Research Laboratory, United States Environmental Protection Agency, Research Triangle Park, NC 27711, USA.
Trends Ecol Evol. 2014 Apr;29(4):233-42. doi: 10.1016/j.tree.2014.02.003. Epub 2014 Mar 15.
Genetic admixture of divergent intraspecific lineages is increasingly suspected to have an important role in the success of colonising populations. However, admixture is not a universally beneficial genetic phenomenon. Selection is typically expected to favour locally adapted genotypes and can act against admixed individuals, suggesting that there are some conditions under which admixture will have negative impacts on population fitness. Therefore, it remains unclear how often admixture acts as a true driver of colonisation success. Here, we review the population consequences of admixture and discuss its costs and benefits across a broad spectrum of ecological contexts. We critically evaluate the evidence for a causal role of admixture in successful colonisation, and consider that role more generally in driving population range expansion.
不同种内谱系的基因混合越来越被怀疑在殖民种群的成功中起着重要作用。然而，混合并不是一种普遍有益的遗传现象。选择通常有利于适应局部环境的基因型，而不利于混合个体，这表明在某些条件下，混合会对种群的适合度产生负面影响。因此，混合作为殖民成功的真正驱动力的频率仍不清楚。在这里，我们回顾了混合的种群后果，并讨论了在广泛的生态背景下混合的成本和收益。我们批判性地评估了混合在成功殖民中因果作用的证据，并考虑了混合在驱动种群范围扩张方面的更普遍作用。
