Spatial patterns of self-recruitment of a coral reef fish in relation to island-scale retention mechanisms
Spatial patterns of self-recruitment of a coral reef fish in relation to island-scale retention mechanisms
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DOI：
10.1111/mec.13823
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发表时间：
2016-10-01
影响因子：
4.9
通讯作者：
Bernardi, Giacomo
中科院分区：
文献类型：
--
作者：
Beldade, Ricardo;Holbrook, Sally J.;Bernardi, Giacomo
海洋学特征影响海洋幼虫的运输和交付，而物理保留机制，如漩涡，可以加强自我招募（即幼虫返回其出生种群）。了解珊瑚礁动物幼虫的孵化（起源）和定居（到达）的确切位置，提供了一种将观察到的自我招募“连通性”模式与从水循环模式中预期的模式进行比较的手段。利用基于法属波利尼西亚Moorea多个采样年份的亲代推断，我们描述了海葵鱼Amphiprion chrysopterus自我招募的时空变化。评估自我招募的净扩散距离与被动粒子扩散的零期望的一致性，并测试来自某些珊瑚礁栖息地（泻湖和通道）的幼虫将被保留，因此比来自外部（前）珊瑚礁的幼虫更有可能自我招募的假设。已知的自我招募的估计值在抽样年份是一致的（类似于抽样新兵的25-27%）。对于大多数（88%）自招募的幼虫，孵化和定居地点之间的净距离在中性浮力被动粒子根据幼虫弥散期的最长持续时间和Moorea周围水流的平均方向和速度所期望的最大扩散距离之内。此外，在Moorea外（前）礁上的一个给定体型的父母比那些经过的父母更不可能产生自我招募。我们的研究结果表明，即使是基于净平均流量和沿岸洋流方向的简单扩散模型，也可以提供对珊瑚礁鱼类景观尺度保留模式的洞察。
Oceanographic features influence the transport and delivery of marine larvae, and physical retention mechanisms, such as eddies, can enhance self-recruitment (i.e. the return of larvae to their natal population). Knowledge of exact locations of hatching (origin) and settlement (arrival) of larvae of reef animals provides a means to compare observed patterns of self-recruitment 'connectivity' with those expected from water circulation patterns. Using parentage inference based on multiple sampling years in Moorea, French Polynesia, we describe spatial and temporal variation in self-recruitment of the anemonefish Amphiprion chrysopterus, evaluate the consistency of net dispersal distances of self-recruits against the null expectation of passive particle dispersal and test the hypothesis that larvae originating in certain reef habitats (lagoons and passes) would be retained and thus more likely to self-recruit than those originating on the outer (fore) reef. Estimates of known self-recruitment were consistent across the sampling years (similar to 25-27% of sampled recruits). For most (88%) of these self-recruits, the net distance between hatching and settlement locations was within the maximum dispersal distance expected for a neutrally buoyant passive particle based on the longest duration of the larval dispersive phase and the average direction and speed of current flow around Moorea. Furthermore, a parent of a given body size on the outer (fore) reef of Moorea was less likely to produce self-recruits than those in passes. Our findings show that even a simple dispersal model based on net average flow and direction of alongshore currents can provide insight into landscape-scale retention patterns of reef fishes.