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首页> 外文期刊>ICES Journal of Marine Science >Partial migration and early size of southern hake Merluccius australis: a journey between estuarine and oceanic habitats off Northwest Patagonia
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Partial migration and early size of southern hake Merluccius australis: a journey between estuarine and oceanic habitats off Northwest Patagonia

机译：南鳕无脊椎动物的部分迁移和早期规模：西北巴塔哥尼亚附近的河口和海洋生境之间的旅程

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摘要

Partial migration is a key adaptive strategy, increasingly observed across multiple taxa. To investigate partial migration and life-cycle diversity of Merluccius australis in northwestern Patagonia, we analysed isotopic (delta C-13, delta O-18) and elemental (B-11, Na-23, Mg-24, Mn-55, Sr-86, Ba-138) compositions of otoliths from juveniles, sub-adults, and adults to identify nursery origins, habitats used, and migratory behaviours of multiple cohorts (1990-2005). Influence of early size upon migration was assessed by comparing back-calculated sizes at demersal recruitment between resident and migratory adults. Although partial migration occurred at both estuarine and oceanic nursery habitats, migratory behaviour was more frequent in fish of estuarine origin (59%) than in fish of oceanic origin (17%). Adults of estuarine origin dominated both estuarine (92%) and oceanic (77%) sampling areas. Although we found no significant differences in size at demersal recruitment between oceanic-resident and oceanic-migratory fish, a strong relationship between size at demersal recruitment and migratory behaviour appeared in fish of estuarine origin, whose probability of migration increased from 5% to 95% as demersal recruitment size increased from 18.8 to 23.6cm. Further research on M. australis life cycle is required to incorporate sub-population processes into the stock assessment and management models being used for this overexploited species.
机译：部分迁移是一种关键的自适应策略，在多个分类单元中越来越多地被观察到。为了调查巴塔哥尼亚西北部南方墨鱼的部分迁移和生命周期多样性，我们分析了同位素（δC-13，δO-18）和元素（B-11，Na-23，Mg-24，Mn-55，Sr） -86，Ba-138）来自少年，亚成人和成年人的耳石组成，以鉴定托儿所的起源，所使用的栖息地以及多个队列的迁徙行为（1990-2005）。早期大小对迁移的影响通过比较常住成年人和迁徙成年人在进行水下招募时的反向计算大小进行评估。尽管在河口和海洋苗圃栖息地都发生了部分迁徙，但河口起源的鱼类（59％）比海洋起源的鱼类（17％）的迁徙行为更为频繁。河口来源的成年人占河口（92％）和海洋（77％）采样区的主导。尽管我们发现海洋居民和远洋迁移的鱼类在海底捞的大小上没有显着差异，但是河口起源的鱼类在海底捞的大小与迁徙行为之间存在密切的关系，其迁移的可能性从5％增加到95％随着水下募集规模从18.8厘米增加到23.6厘米。需要进一步研究澳大利亚分枝杆菌的生命周期，以将亚种群过程纳入用于该过度开发物种的种群评估和管理模型中。

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