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Propagule dispersal and larval patch cohesiveness in a Mediterranean coastal fish

机译：地中海沿岸鱼类的繁殖体扩散和幼虫斑块的内聚力

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The assessment of fish dispersal is fundamental for both conservation and management of fishery resources as it provides crucial information for the establishment of more effective marine protected areas (MPAs) and networks of MPAs. In this study, we investigated the elemental composition of otoliths in early life stages of the saddled sea bream Oblada melanura (Linnaeus, 1758) (Perciformes: Sparidae) in order to obtain information on its propagule (egg and larva) dispersal in the south-western Mediterranean Sea. Specifically, using pre-settlement individuals we investigated (1) larval patch cohesiveness during the last phase of larval life; and with early post-settlement individuals we investigated (2) the number of potential natal sources, and (3) propagule dispersal distances. Results indicated that different larval patches can merge in the pelagic environment after having travelled separately for some days. In total, 7 natal sources were found to replenish, with different proportions, almost all sampling sites along a stretch of coastline of similar to 180 km, suggesting that propagule dispersal can extend at least up to similar to 90 km. This information provides important insights for understanding fish dispersal processes and supports the appropriate establishment of spatially explicit conservation strategies such as MPAs and MPA networks in the south-western Mediterranean Sea.
机译：对鱼类扩散的评估对于养护和管理渔业资源都是至关重要的，因为它为建立更有效的海洋保护区和海洋保护区网络提供了重要信息。在这项研究中，我们调查了有鞍鲷（Oblada melanura）（Linnaeus，1758）（Perciformes：Sparidae）早期生活阶段耳石的元素组成，以便获得有关其在繁殖体（卵和幼虫）中扩散的信息。西地中海。具体来说，我们使用安置前的个体研究（1）幼虫生命最后阶段的幼虫斑块内聚力；并且与早期安置后的个体一起，我们调查了（2）潜在的出生来源的数量，以及（3）传播传播的距离。结果表明，不同的幼虫斑块在分开旅行几天后可以在中上层环境中融合。总共发现了沿着不同的海岸线（约180 km）的几乎所有采样点，以不同的比例补充了7个新生源，这表明繁殖体的扩散至少可以延伸到约90 km。这些信息为了解鱼类的传播过程提供了重要的见识，并支持在地中海西南部适当建立空间明确的保护策略，例如MPA和MPA网络。

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