Recruitment of coral-reef fishes to Bermuda: local retention or long-distance transport?
Recruitment of coral-reef fishes to Bermuda: local retention or long-distance transport?
复制标题
向百慕大招募珊瑚礁鱼类：本地保留还是长途运输？
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
R. Cowen
中科院分区：
文献类型：
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作者：
E. Schultz;R. Cowen
孤立的海洋岛屿的底栖海洋动物可能是自我播种的，或者也可能是通过洋流从其他地方平流输送的补充物不断提供的。将从其他地方运输幼鱼所需时间的估计数与关于百慕大珊瑚礁鱼类幼鱼持续时间的资料相结合，以检验其他种群是百慕大新兵来源的假设。具体来说，我们测试了运输发生频繁，足以维持当地的珊瑚礁鱼类种群的预测。在几个数值模拟中，幼虫的运输被建模为两步过程。第一步的运输被认为是通过墨西哥湾流发生的。第二步，幼虫被运送到整个北方马尾藻海的百慕大群岛，在几个不同的方式，涉及冷芯环抛出的流，或混合物的墨西哥湾流和马尾藻水夹带的冷芯环。通过多种来源估计了移动距离和速度，重点是海洋表面温度的卫星图像Pelag~c幼虫持续时间（PLD）的珊瑚礁f~sh在百慕大进行了分析，从每天的年龄记录在6濑鱼和1鹦嘴鱼种的耳石。当PLDs与运输时间进行比较，它被确定为运输事件发生太少，以维持珊瑚礁鱼类种群。这些物种中的大多数的PLD是类似的结果在其地理范围内的其他地方。很明显，这些种群必须主要通过在当地产卵并保留在百慕大群岛附近的幼虫库来补充。
The benthic marine fauna of isolated oceanic islands may be self-seeding, or alternatively may be continually supplied with recruits advected from elsewhere by ocean currents. Estimates of the time required for transport of larvae from elsewhere was combined with information on the larval durations of fishes inhabiting the reefs of Bermuda, to test the hypothesis that other populations are sources for recruits to Bermuda. Specifically, we tested the prediction that transport occurs frequently enough to sustain local populations of reef fishes. Transport of larvae was modelled as a 2-step process in several numerical simulations. The first step of transport was assumed to occur via the Gulf Stream. The second step, in which larvae are transported across the northern Sargasso Sea to Bermuda, was modelled in several different ways, Involving either cold-core rings thrown off by the Stream, or mixtures of Gulf Stream and Sargasso water entrained by cold-core rings. Travel distances and speeds were estimated from a variety of sources, focusing on satellite imagery of sea-surface temperature Pelag~c larval durations (PLDs) for reef f~sh on Bermuda were analyzed from the daily age record in the otoliths of 6 wrasse and 1 parrotfish species. When PLDs were compared with transport times, it was determined that transport events would occur too infrequently to sustain Bermudian populations of reef fishes. The PLDs for most of these species are similar to results obtained elsewhere in their geographic range. It is evident that these populations must be mainly replenished via a pool of larvae that are spawned locally and retained in the vicinity of the Bermuda islands.