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首页> 外文期刊>ICES Journal of Marine Science >Partial female migration and cool-water migration pathways in an overfished shark
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Partial female migration and cool-water migration pathways in an overfished shark

机译：过度捕捞鲨鱼的部分雌性迁移和冷水迁移途径

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Knowledge about reproductive movements can be of important conservation value for over-exploited species that are vulnerable when moving between and within key reproductive habitats. Lack of knowledge persists around such movements in the overfished school shark Galeorhinus galeus in Australia. Management assumes all pregnant females migrate between adult aggregations in the Great Australian Bight, South Australia, and nursery areas around Bass Strait and Tasmania. We tracked 14 late-term pregnant females tagged in South Australia using satellite-linked pop-up archival tags to investigate extent, timing, and routes of migrations. We found partial migration, with some females (n=7) remaining near aggregating areas throughout the pupping season, some migrating to known nursery areas (n=3), and one migrating similar to 3 000km to New Zealand. We conclude female movements and pupping habitats are less spatially constrained than assumed and propose females use cool-water routes along the shelf break to reduce energy costs of migration. Migrating females using these routes faced greater fishing pressure than sharks in inshore areas and were not protected by inshore shark fishing closures designed to protect them. This study demonstrates the complexity of reproductive movements that can occur in wide-ranging species and highlights the value of explicit movement data.
机译：对于在主要生殖生境之间或内部移动时易受攻击的过度开发物种，有关生殖运动的知识可能具有重要的保护价值。在澳大利亚过度捕捞的学校鲨鱼Galeorhinus galeus中，这种运动仍然缺乏知识。管理层假设所有怀孕的雌性在大澳大利亚湾，南澳大利亚以及巴斯海峡和塔斯马尼亚州的苗圃地区之间的成年种群之间迁移。我们使用卫星链接的弹出式档案标签跟踪了南澳大利亚州标记的14名晚期怀孕女性，以调查迁移的程度，时间和途径。我们发现了部分迁徙，在整个成虫季节，有一些雌性（n = 7）留在聚集地区附近，有一些迁徙到了已知的苗圃地区（n = 3），有一个迁徙了大约3000公里到新西兰。我们得出的结论是，雌性的活动和成年幼崽的栖息地在空间上受到的约束比想象的要少，并建议雌性在架子上使用冷水路线以减少迁移的能源成本。使用这些路线移徙的雌性比近海鲨鱼面临更大的捕鱼压力，并且不受旨在保护她们的近海鲨鱼捕捞封闭设施的保护。这项研究证明了广泛物种中可能发生的生殖运动的复杂性，并强调了明确运动数据的价值。

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