A selective advantage to immigrant genes in a Daphnia metapopulation
A selective advantage to immigrant genes in a Daphnia metapopulation
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DOI：
10.1126/science.1067485
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发表时间：
2002-01-18
期刊：
影响因子：
56.9
通讯作者：
Pajunen, VI
中科院分区：
文献类型：
--
作者：
Ebert, D;Haag, C;Pajunen, VI
移民到栖息地所占据的同种生物通常被认为是竞争劣势，因为居民可能是当地适应。然而，如果居民是近亲繁殖的，移民和居民之间的交配会产生后代，这些后代可能会从杂交优势中获得健康优势。我们证明了这种效果的实验在一个自然的水蚤集合种群中，遗传瓶颈和当地近亲繁殖是常见的。我们估计，在这个集合种群中，杂交优势放大了基因流的速率比从名义迁移率预测的要多几倍。这可能会影响当地种群和整个集合种群的持久性。
Immigrants to habitats occupied by conspecific organisms are usually expected to be competitively inferior, because residents may be locally adapted. If residents are inbred, however, mating between immigrants and residents results in offspring that may enjoy a fitness advantage from hybrid vigor. We demonstrate this effect experimentally in a natural Daphnia metapopulation in which genetic bottlenecks and local inbreeding are common. We estimate that in this metapopulation, hybrid vigor amplifies the rate of gene flow several times more than would be predicted from the nominal migration rate. This can affect the persistence of local populations and the entire metapopulation.