Invading populations of an ornamental shrub show rapid life history evolution despite genetic bottlenecks
Invading populations of an ornamental shrub show rapid life history evolution despite genetic bottlenecks
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DOI：
10.1111/j.1461-0248.2008.01181.x
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发表时间：
2008-07-01
期刊：
影响因子：
8.8
通讯作者：
Parker, Ingrid M.
中科院分区：
文献类型：
--
作者：
Dlugosch, Katrina M.;Parker, Ingrid M.
人类介导的物种引入为研究非本地物种何时以及如何适应新环境，以及进化是否有可能促进殖民成功提供了机会。许多长期建立的引种具有高度的遗传多样性，这提高了遗传物质的多次引种催化适应和/或入侵性进化的可能性。对新生入侵的研究很少，但对于理解遗传多样性是否促进种群扩张至关重要。研究了入侵灌木金丝雀金丝桃（Hypericum canariense）始创种群的变异和进化。我们发现，这些引种经历了遗传多样性的大幅减少，但生长的增加和开花物候的纬度梯度仍在进化。这些生活史的变化与入侵植物的预测是一致的。我们的研究结果强调，即使是基因缺失的创始种群，也有可能适应并进化出侵入性的传播模式。
Human-mediated species introductions offer opportunities to investigate when and how non-native species to adapt to novel environments, and whether evolution has the potential to contribute to colonization success. Many long-established introductions harbour high genetic diversity, raising the possibility that multiple introductions of genetic material catalyze adaptation and/or the evolution of invasiveness. Studies of nascent invasions are rare but crucial for understanding whether genetic diversity facilitates population expansion. We explore variation and evolution in founder populations of the invasive shrub Hypericum canariense. We find that these introductions have experienced large reductions in genetic diversity, but that increased growth and a latitudinal cline in flowering phenology have nevertheless evolved. These life history changes are consistent with predictions for invasive plants. Our results highlight the potential for even genetically depauperate founding populations to adapt and evolve invasive patters of spread.