Testing early life connectivity supplying a marine fishery around the Falkland Islands
Testing early life connectivity supplying a marine fishery around the Falkland Islands
复制标题
测试早期生命连通性，为福克兰群岛周围的海洋渔业提供服务
DOI：
10.1016/j.fishres.2012.01.023
复制
发表时间：
2012
影响因子：
2.4
通讯作者：
Cynthia M. Jones
中科院分区：
文献类型：
--
作者：
J. Ashford;B. Fach;A. Arkhipkin;Cynthia M. Jones
我们使用风驱动的全球环流模型，根据有关巴塔哥尼亚齿鱼（Dissostichus eleginoides）平流供应福克兰群岛周围拖网渔业的对立假设，建立了空间明确的预测，并使用渔场捕获的鱼的耳石中记录的化学成分测试了这些预测。模型模拟显示了从智利南部产卵聚集到捕捞区北部和南部的运输路径。相比之下，伯德伍德浅滩周围的产卵聚集体释放的模拟颗粒被输送到捕鱼区的南部，而不是北部，而是完全夹带在亚南极锋线上。生命早期耳石核中化学成分的空间异质性否定了伯德伍德浅滩上有一个产卵区的单一种群的假设，并表明鱼类组合是由来自智利南部和伯德伍德浅滩的大规模运输构成的。通过将鱼类与其自然环境明确联系起来，这两种技术可以帮助区分种群持续存在所需的生命周期轨迹，并阐明水文学和生活史之间的相互作用，这些相互作用构成了海洋渔业所依赖的鱼类组合。
We used a wind-driven global circulation model to build spatially explicit predictions from rival hypotheses concerning advective supply of Patagonian toothfish (Dissostichus eleginoides) to a trawl fishery around the Falkland Islands, and tested the predictions using chemistry recorded in the otoliths of fish caught in the fishery. Model simulations indicated transport pathways from spawning aggregations off southern Chile to both the north and south of the fishing area. In contrast, simulated particles released from spawning aggregations around Burdwood Bank were transported to the south of the fishing area but not to the north, becoming fully entrained in the Subantarctic Front instead. Spatial heterogeneity in the chemistry laid down in the otolith nuclei during early life discounted the hypothesis of a single population with a spawning area on Burdwood Bank, and indicated that fish assemblages are structured by large-scale transport from both southern Chile and Burdwood Bank. By linking fish explicitly to their physical environment, the two techniques can help distinguish the life cycle trajectories necessary for populations to persist, and elucidate the interactions between hydrography and life history that structure the fish assemblages on which marine fisheries depend.