The impact of human-made ecological changes on the genetic architecture of Daphnia species
The impact of human-made ecological changes on the genetic architecture of Daphnia species
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DOI：
10.1073/pnas.0807187106
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发表时间：
2009-03-24
影响因子：
11.1
通讯作者：
Schwenk, Klaus
中科院分区：
文献类型：
--
作者：
Brede, Nora;Sandrock, Christoph;Schwenk, Klaus
水生生态系统营养物质过度富集（富营养化）导致藻华和缺氧条件，一直是一个持续而广泛的环境问题。尽管有许多关于磷 (P) 水平升高的生态影响（例如生物多样性和水质下降）的研究，但对于动物物种的进化后果却知之甚少。我们利用从过去 100 年的沉积物层中分离出来的滞育卵，重建了欧洲 2 个湖泊中水蚤物种复合体的遗传结构。总磷的变化显然与物种组成和进化谱系的种群结构的变化相关。尽管在 20 世纪 70 年代和 80 年代富营养化高峰之后，环境条件已基本恢复，但原始物种组成和物种遗传结构并未恢复，而是沿着新的进化轨迹进化。我们的数据表明，人为引起的栖息地暂时改变与通过种间杂交和基因渗入而引起的群落和物种的长期变化有关。
The overenrichment (eutrophication) of aquatic ecosystems with nutrients leading to algal blooms and anoxic conditions has been a persistent and widespread environmental problem. Although there are many studies on the ecological impact of elevated phosphorus (P) levels (e.g., decrease in biodiversity and water quality), little is known about the evolutionary consequences for animal species. We reconstructed the genetic architecture of a Daphnia species complex in 2 European lakes using diapausing eggs that were isolated from sediment layers covering the past 100 years. Changes in total P were clearly associated with a shift in species composition and the population structure of evolutionary lineages. Although environmental conditions were largely re-established after peak eutrophication during the 1970s and 1980s, original species composition and the genetic architecture of species were not restored but evolved along new evolutionary trajectories. Our data demonstrate that anthropogenically induced temporal alterations of habitats are associated with long-lasting changes in communities and species via interspecific hybridization and introgression.