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首页> 外文期刊>Marine ecology progress series >Natural tags reveal populations of Conservation Dependent school shark use different pupping areas
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Natural tags reveal populations of Conservation Dependent school shark use different pupping areas

机译：自然标签揭示了保护依赖型学校鲨鱼的种群使用不同的幼仔区

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Knowledge of reproductive movements and sources of recruitment in highly mobile species is important to understand population-level resilience and to manage recovery in populations depleted by human interference. Management of the school shark Galeorhinus galeus (Linnaeus, 1758), a Conservation Dependent species in Australia subject to a national recovery strategy after stock collapse from overfishing, has long assumed obligate female migration to pupping areas in the southeast of their range. We used post-natal elemental signatures of individuals from 3 cohorts born in 1996 to 1998 as a proxy to test whether females use common pupping areas. Environmental or biological factors that differ among pupping areas can give rise to unique trace element signatures in shark vertebrae that act as natural tags and can be used to assess relative contributions from recruitment sources to adult populations. We compared post-natal signatures from sharks caught in 2 regions, South Australia in the northwest of the species' range and Bass Strait in the southeast, using laser ablation inductively coupled mass spectrometry. Signatures were similar between regions for 1 cohort, suggesting high use of shared or similar pupping areas, but differed for the 2 remaining cohorts. Region of capture could also be accurately predicted ( 75%) based on post-natal signatures, refuting the long-held view that all females use common pupping areas. We conclude that female movements and reproductive strategies are likely more plastic than previously assumed, highlighting the need to clarify them and their potential effects on resilience and conservation.
机译：对高度活动物种的生殖运动和募集来源的了解对于了解人口一级的复原力和管理由于人类干扰而耗尽的人口的恢复非常重要。鲨鱼Galeorhinus galeus（Linnaeus，1758）是澳大利亚的一种保护性物种，在过度捕捞导致种群崩溃后，该物种受到国家的恢复策略管理。我们使用1996年至1998年出生的3个队列的个体的产后元素特征作为代理，以测试女性是否使用普通的小便区。幼崽区域之间环境或生物因素的不同会导致鲨鱼椎骨中独特的痕量元素特征，这些特征充当自然标记，并可用于评估招募来源对成年人群的相对贡献。我们使用激光烧蚀感应耦合质谱法比较了两个区域（鲨鱼种类范围的西北部的南澳大利亚和东南部的巴斯海峡）中捕获的鲨鱼的产后特征。 1个队列的区域之间的签名相似，表明对共享或相似的小便区域的使用率很高，但其余2个队列则有所不同。根据出生后的特征，也可以准确地预测捕获的区域（> 75％），驳斥长期以来一直认为所有雌性使用共同的幼仔区的观点。我们得出的结论是，女性运动和生殖策略可能比以前设想的更具可塑性，强调需要澄清它们及其对复原力和保护的潜在影响。

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