Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish
Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish
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DOI：
10.1007/s00442-011-2058-1
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发表时间：
2012-01-01
期刊：
影响因子：
2.7
通讯作者：
Heath, Daniel D.
中科院分区：
文献类型：
--
作者：
Hogan, J. Derek;Thiessen, Roger J.;Heath, Daniel D.
海洋种群在面对骚乱时的坚持性和应变能力直接受到种群之间联系的影响。因此，了解种群间联系的大小和模式以及这些模式的时间变化对于有效管理和养护海洋物种至关重要。尽管我们对海洋连通性的理解最近取得了进展，但很少有经验研究直接衡量海洋鱼类种群之间的联系的大小或模式，也没有明确研究人口连通性的时间变化。我们使用遗传分配测试来跟踪456种个体幼鱼的扩散情况，以量化在三年期间内七个珊瑚礁鱼种群内部和之间的连通性、扩散、自我招募和局部保留的程度。我们发现，一些幼虫确实会远距离分散(类似于200公里)；然而，自我招募是一种常规现象。重要的是，我们发现扩散距离、自我招募、本地保留和连通性模式在不同年份之间存在显著差异。我们的数据突出了连通性的不可预测性，并强调了需要更多、在时间上重复的经验性连通性衡量标准，以便为管理层决策提供信息。
The persistence and resilience of marine populations in the face of disturbances is directly affected by connectivity among populations. Thus, understanding the magnitude and pattern of connections among populations and the temporal variation in these patterns is critical for the effective management and conservation of marine species. Despite recent advances in our understanding of marine connectivity, few empirical studies have directly measured the magnitude or pattern of connections among populations of marine fishes, and none have explicitly investigated temporal variation in demographic connectivity. We use genetic assignment tests to track the dispersal of 456 individual larval fishes to quantify the extent of connectivity, dispersal, self-recruitment and local retention within and among seven populations of a coral reef fish (Stegastes partitus) over a three-year period. We found that some larvae do disperse long distances (similar to 200 km); however, self-recruitment was a regular phenomenon. Importantly, we found that dispersal distances, self-recruitment, local retention and the pattern of connectivity varied significantly among years. Our data highlight the unpredictable nature of connectivity, and underscore the need for more, temporally replicated, empirical measures of connectivity to inform management decisions.