Potential Connectivity of Coldwater Black Coral Communities in the Northern Gulf of Mexico.
Potential Connectivity of Coldwater Black Coral Communities in the Northern Gulf of Mexico.
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DOI：
10.1371/journal.pone.0156257
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Bracco A
中科院分区：
文献类型：
--
作者：
Cardona Y;Ruiz-Ramos DV;Baums IB;Bracco A
黑珊瑚Leiopathes glberrima是深海底栖动物群落的基础物种，但人们对其幼虫的寿命和产卵时间知之甚少，因为它生活在50米以下的环境中，在后勤方面很难观察。在这里，使用遗传和物理扩散模型研究了墨西哥湾北部的石斑藻的潜在连通性。遗传分析集中在分布在密西西比峡谷东部和西部的四个地点收集的数据，提供了许多(约10,000)代人的集成信息，并揭示了较低但可检测到的连接。物理扩散模式以1公里的水平分辨率模拟墨西哥湾北部的环流，具有运输跟踪能力；虚拟幼虫在3年中部署了12次，每隔40天进行一次跟踪。由于复杂的水深测量，密西西比峡谷东部和西部的平均环流差异，以及几公里范围内的水流不稳定，峡谷东部和西部的站点之间的连通性受到阻碍。此外，流场的年际变化超过了季节变化。综上所述，这些结果表明，a)在站点之间的扩散是有限的，b)在大扰动事件中的任何恢复将取决于幸存个体产生的本地幼虫，以及c)在过去10,000代连通性没有显著变化的假设下，需要一个月以上的能力期才能使模拟的潜在连通性与来自多基因座遗传数据的连通性相匹配。
The black coral Leiopathes glaberrima is a foundation species of deep-sea benthic communities but little is known of the longevity of its larvae and the timing of spawning because it inhabits environments deeper than 50 m that are logistically challenging to observe. Here, the potential connectivity of L. glaberrima in the northern Gulf of Mexico was investigated using a genetic and a physical dispersal model. The genetic analysis focused on data collected at four sites distributed to the east and west of Mississippi Canyon, provided information integrated over many (~10,000) generations and revealed low but detectable realized connectivity. The physical dispersal model simulated the circulation in the northern Gulf at a 1km horizontal resolution with transport-tracking capabilities; virtual larvae were deployed 12 times over the course of 3 years and followed over intervals of 40 days. Connectivity between sites to the east and west of the canyon was hampered by the complex bathymetry, by differences in mean circulation to the east and west of the Mississippi Canyon, and by flow instabilities at scales of a few kilometers. Further, the interannual variability of the flow field surpassed seasonal changes. Together, these results suggest that a) dispersal among sites is limited, b) any recovery in the event of a large perturbation will depend on local larvae produced by surviving individuals, and c) a competency period longer than a month is required for the simulated potential connectivity to match the connectivity from multi-locus genetic data under the hypothesis that connectivity has not changed significantly over the past 10,000 generations.