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首页> 外文期刊>Marine ecology progress series >Limited latitudinal ranging of juvenile whale sharks in the Western Indian Ocean suggests the existence of regional management units
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Limited latitudinal ranging of juvenile whale sharks in the Western Indian Ocean suggests the existence of regional management units

机译：西印度洋上幼鲸鲨的纬度范围有限表明存在区域管理单位

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摘要

Assessing the movements and connectivity of whale sharks Rhincodon typus through their range is difficult due to high individual mobility and limited knowledge of their behaviour following dispersal from coastal aggregation sites. Here, we use a large set of photo-identification and stable isotope data (delta N-15 and delta C-13) to test the assumption that sharks frequenting aggregation sites in Mozambique, Tanzania, and Qatar are a mixed stock, as inferred by genetic data. Photo-identification revealed negligible connectivity among aggregation sites and none between the southern and central areas of the Western Indian Ocean (Mozambique and Tanzania) and the Arabian Gulf (Qatar). Sight-resight data indicated that shark movements at each site could be best represented by a model that included emigration, re-immigration, and some mortality or permanent emigration. Although there was high individual variation in the isotope profiles of sharks from each location, comparison with latitudinal isotope data suggests that sharks had shown site fidelity to within a few hundred kilometres of each study area over the period of isotopic integration. Given the Endangered status of whale sharks and regional differences in anthropogenic threat profiles, further studies-and conservation assessment efforts-should consider the possibility that whale shark subpopulations exist over smaller geographical scales than previously documented.
机译：由于个体活动力强以及从沿海聚集地扩散后的行为知之甚少，因此很难评估整个范围内的鲸鲨Rhincodon typus的活动和连通性。在这里，我们使用大量的光识别和稳定的同位素数据（δN-15和δC-13）来检验假设，即经常在莫桑比克，坦桑尼亚和卡塔尔聚集的鲨鱼是混合种群，由遗传数据。照片识别显示聚集点之间的连通性可忽略不计，西印度洋（莫桑比克和坦桑尼亚）的南部和中部地区与阿拉伯湾（卡塔尔）之间的连通性很小。视线数据表明，每个地点的鲨鱼运动都可以用包括移民，再移民以及一些死亡率或永久移民的模型来最好地表示。尽管鲨鱼的同位素分布在每个位置都有很高的个体差异，但与纬向同位素数据的比较表明，在同位素整合期间，鲨鱼在每个研究区域的数百公里范围内都表现出部位保真度。考虑到鲸鲨的濒危状况和人为威胁概况的区域差异，应进行进一步的研究和保护评估工作，以考虑鲸鲨亚种群存在于比先前记录的更小的地理范围内的可能性。

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