Besson Marc, Gache Camille, Brooker Rohan M, Moussa Rakamaly Madi, Waqalevu Viliame Pita, LeRohellec Moana, Jaouen Vincent, Peyrusse Kévin, Berthe Cécile, Bertucci Frédéric, Jacob Hugo, Brié Christophe, Wan Bruno, Galzin René, Lecchini David
PSL Research University: EPHE-UPVD-CNRS, USR 3278 CRIOBE, BP, Moorea, French Polynesia.
UMR 7232, CNRS-UPMC, Observatoire Océanologique de Banyuls-sur-Mer, Banyuls-sur-Mer, France.
PLoS One. 2017 Jun 8;12(6):e0178795. doi: 10.1371/journal.pone.0178795. eCollection 2017.
For marine fishes with a bipartite life cycle, pelagic larval dispersal can shape the distribution, connectivity, composition and resilience of adult populations. Numerous studies of larval dispersal, and associated settlement and recruitment processes, have examined the relationship between population connectivity and oceanographic features. However, relatively little is known about spatial and temporal variation in the abundance of larvae settling among different reefs and the extent to which the species assemblage of larvae settling at one location is reflective of the assemblage in neighbouring areas. Here, using crest nets, which provide a non-selective measure of the total abundance and assemblage of larvae settling to a reef (i.e. larval supply), we collected larval coral reef fishes at five locations surrounding two spatially disparate French Polynesian islands: Moorea and Nengo-Nengo. Overall, larval settlement patterns were correlated with the lunar cycle, with larval abundance peaking during the new moon. Although there were some spatial differences in larval supply among the five monitored sites, settlement patterns were largely consistent, even at the species level, irrespective of factors such as coastline orientation or distance between sites. This study provides further insights into the mechanisms driving patterns of dispersal and settlement of larval fishes over large spatial scales.
对于具有双相生命周期的海洋鱼类而言，浮游幼体扩散能够塑造成年种群的分布、连通性、组成和恢复力。众多关于幼体扩散以及相关的定居和补充过程的研究，探讨了种群连通性与海洋学特征之间的关系。然而，对于不同珊瑚礁上幼体定居数量的时空变化，以及在一个地点定居的幼体物种组合在多大程度上反映相邻区域的组合情况，我们了解得相对较少。在这里，我们使用冠网来收集环绕法属波利尼西亚两个空间上相距甚远的岛屿——莫雷阿岛和嫩戈嫩戈岛——周围五个地点的幼体珊瑚礁鱼类。冠网提供了一种对定居到珊瑚礁的幼体总数量和组合情况的非选择性测量方法（即幼体供应）。总体而言，幼体定居模式与月相周期相关，幼体数量在新月期间达到峰值。尽管在所监测的五个地点之间幼体供应存在一些空间差异，但定居模式在很大程度上是一致的，甚至在物种层面也是如此，而与诸如海岸线方向或地点之间距离等因素无关。这项研究为驱动幼体鱼类在大空间尺度上的扩散和定居模式的机制提供了进一步的见解。
