Extreme streams: species persistence and genomic change in montane insect populations across a flooding gradient.
Extreme streams: species persistence and genomic change in montane insect populations across a flooding gradient.
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极端溪流：洪水梯度范围内山地昆虫种群的物种持久性和基因组变化。
DOI：
10.1111/ele.12918
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发表时间：
2018
期刊：
影响因子：
8.8
通讯作者：
W. Funk
中科院分区：
文献类型：
--
作者：
N. Poff;Erin I. Larson;P. Salerno;Scott G. Morton;B. Kondratieff;A. Flecker;K. Zamudio;W. Funk
人们对极端事件的生态和进化后果知之甚少。在这里，我们测试的预测物种的持久性和种群基因组变化水生昆虫在14个科罗拉多山区溪流在500年一遇的降雨事件引起的水文扰动梯度。类群的持久性范围从39%至77%的网站和下降，增加干扰有关物种的抗性和弹性特征。对于类群与移动的幼虫和陆地成人阶段目前在洪水的时间，平均持久性为84%，相比25%的im移动的类群，缺乏陆地成人。对于两个分析的六个物种，基因组多样性（等位基因丰富度）下降后的事件。对于一个物种来说，它大大扩展了，这表明通过上游种群的重新殖民而具有弹性。因此，虽然阻力和弹性特征可以解释物种持久性极端干扰，种群基因组变化各不相同的物种，挑战概括进化的极端事件在景观尺度。
The ecological and evolutionary consequences of extreme events are poorly understood. Here, we tested predictions about species persistence and population genomic change in aquatic insects in 14 Colorado mountain streams across a hydrological disturbance gradient caused by a one in 500-year rainfall event. Taxa persistence ranged from 39 to 77% across sites and declined with increasing disturbance in relation to species' resistance and resilience traits. For taxa with mobile larvae and terrestrial adult stages present at the time of the flood, average persistence was 84% compared to 25% for immobile taxa that lacked terrestrial adults. For two of six species analysed, genomic diversity (allelic richness) declined after the event. For one species it greatly expanded, suggesting resilience via re-colonisation from upstream populations. Thus, while resistance and resilience traits can explain species persistence to extreme disturbance, population genomic change varies among species, challenging generalisations about evolutionary responses to extreme events at landscape scales.