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首页> 外文期刊>Marine ecology progress series >From migrants to mossbacks: tracer- and tag-inferred habitat shifts in the California yellowtail Seriola dorsalis
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From migrants to mossbacks: tracer- and tag-inferred habitat shifts in the California yellowtail Seriola dorsalis

机译：从移民到后背：追踪和标记推断的加利福尼亚黄尾in背栖生境转移

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摘要

The California yellowtail Seriola dorsalis (YT) is an economically and ecologically valuable predator in both coastal and pelagic regions of the California Current Ecosystem. Delineating size- structured migration patterns can help assess population connectivity and predict effects of regional fishing pressure. We used chemical tracers (stable isotope analysis and mercury analysis) and conventional tagging to evaluate the dynamics of a potential ontogenetic shift in habitat from pelagic waters to coastal regions. Stable isotope analysis revealed a shift in habitat use at intermediate sizes (fork length, FL = 76 to 87.5 cm). Smaller YT were isotopically similar to pelagic yellowfin tuna Thunnus albacares, while larger YT were isotopically similar to the coastal white seabass Atractoscion nobilis. Tag recaptures from a small number of fish (48 deployments, 15 recaptures) corroborated an ontogenetic shift from offshore to coastal habitats, suggesting local, residential populations of larger YT in nearshore areas. Mercury concentrations increased directly after the observed habitat shift (FL = 88.3 cm), which is likely a result of both bioaccumulation with age and a shift to higher Hg prey inshore. Residential behavior of mature YT 80 cm (similar to 4 to 12+ yr old) suggests that regional size distributions could be influenced by local fishing pressure and inshore movement dynamics, as recruitment of migrants from southern waters will likely be comprised of smaller, younger fish.
机译：在加利福尼亚州当前生态系统的沿海和中上层地区，加利福尼亚yellow鱼（Seriola dorsalis）（YT）是具有经济和生态价值的捕食者。划定规模结构的迁徙模式可以帮助评估人口的连通性并预测区域捕鱼压力的影响。我们使用化学示踪剂（稳定同位素分析和汞分析）和常规标记来评估栖息地从中上层水域到沿海地区的潜在个体发育变化的动力学。稳定的同位素分析显示，在中等大小（叉长，FL = 76至87.5 cm）下，栖息地的使用发生了变化。较小的YT与上层黄鳍金枪鱼Thunnus albacares的同位素相似，而较大的YT与沿海的白色鲈鱼白术Atractoscion nobilis的同位素相似。从少量鱼类中捕获标签（48次部署，重新捕获15次）证实了从近岸生境到沿海生境的个体发育转变，表明近岸地区更大的YT本地居民种群。在观察到的栖息地转移（FL = 88.3 cm）后，汞浓度立即增加，这可能是由于生物积累随着年龄的增长以及向近岸汞猎物转移的结果。成熟的YT> 80厘米（约4至12岁以上）的居住行为表明，区域规模分布可能受到当地捕鱼压力和近海运动动态的影响，因为从南部水域招募的移民可能更年轻，更年轻鱼。

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