Habitat continuity and stepping-stone oceanographic distances explain population genetic connectivity of the brown alga Cystoseira amentacea
Habitat continuity and stepping-stone oceanographic distances explain population genetic connectivity of the brown alga Cystoseira amentacea
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DOI：
10.1111/mec.13960
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发表时间：
2017-02-01
影响因子：
4.9
通讯作者：
Serrao, Ester A.
中科院分区：
文献类型：
--
作者：
Buonomo, Roberto;Assis, Jorge;Serrao, Ester A.
对于发生在超种群结构中的物种，有效的预测和管理方法需要对种群间连通性有很好的理解。本研究以具有生态系统结构的褐藻Cystoseira amentacea var. stricta为模型，探讨了破碎化分布的海洋物种种群遗传结构是否可以通过踏石式海洋迁移和生境连续性来预测。为了回答这个问题，我们分析了遗传结构，并利用微卫星标记在多个尺度上估计了意大利南部不连续岩石生境斑块种群的连通性。此外，我们还模拟了岩石生境连续性和海洋环流对基因流动的影响，模拟了基于海洋表面流的拉格朗日粒子扩散，允许多代踏脚石动力学。种群高度分化，尺度从几米到几千公里不等。最适合解释遗传结果的模型结合了水流方向、岩石栖息地扩展和沿海岸岩石遗址之间的距离。我们的结论是，可变适宜生境和海洋运输的组合是一个有用的遗传结构预测因子。这种关系提供了深入了解扩散机制和生活史特征的作用。我们的研究结果强调了踏石动力学和海洋定向运输的空间显式建模与栖息地适宜性的重要性，以更好地描述和预测海洋种群结构和分化。该研究还提出了受生境变化影响日益严重的物种保护、恢复和管理的适当空间尺度。
Effective predictive and management approaches for species occurring in a metapopulation structure require good understanding of interpopulation connectivity. In this study, we ask whether population genetic structure of marine species with fragmented distributions can be predicted by stepping-stone oceanographic transport and habitat continuity, using as model an ecosystem-structuring brown alga, Cystoseira amentacea var. stricta. To answer this question, we analysed the genetic structure and estimated the connectivity of populations along discontinuous rocky habitat patches in southern Italy, using microsatellite markers at multiple scales. In addition, we modelled the effect of rocky habitat continuity and ocean circulation on gene flow by simulating Lagrangian particle dispersal based on ocean surface currents allowing multigenerational stepping-stone dynamics. Populations were highly differentiated, at scales from few metres up to thousands of kilometres. The best possible model fit to explain the genetic results combined current direction, rocky habitat extension and distance along the coast among rocky sites. We conclude that a combination of variable suitable habitat and oceanographic transport is a useful predictor of genetic structure. This relationship provides insight into the mechanisms of dispersal and the role of life-history traits. Our results highlight the importance of spatially explicit modelling of stepping-stone dynamics and oceanographic directional transport coupled with habitat suitability, to better describe and predict marine population structure and differentiation. This study also suggests the appropriate spatial scales for the conservation, restoration and management of species that are increasingly affected by habitat modifications.