A global perspective on the trophic geography of sharks
A global perspective on the trophic geography of sharks
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DOI：
10.1038/s41559-017-0432-z
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发表时间：
2018-02-01
影响因子：
16.8
通讯作者：
Trueman, Clive N.
中科院分区：
文献类型：
--
作者：
Bird, Christopher S.;Verissimo, Ana;Trueman, Clive N.
鲨鱼是一群不同的移动捕食者，它们在不同的空间尺度上觅食，并有可能影响食物网的动态。如果鲨鱼类群表现出共同的行为特征，最近鲨鱼生物量下降的生态后果可能会延伸到更广泛的地理范围。通过追踪最终被114个物种的5394条鲨鱼肌肉组织同化的碳原子的光合作用固定的原始位置，我们确定了不同栖息地鲨鱼之间营养相互作用的全球一致的生物地理特征。我们发现，栖息在陆架上的鲨鱼种群有相当大比例的碳来自区域远洋来源，但也包括在其他同位素多样化的当地食物网中觅食的个体，例如由陆地植物来源、底栖生物和大型植物支持的食物网。相比之下，海洋鲨鱼似乎使用的碳来自纬度30度至50度之间。稳定同位素数据的全球规模汇编与生物地球化学模型相结合，产生了关于动物行为的假设，可以用其他方法学方法进行检验。
Sharks are a diverse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits in trophic interactions between sharks found in different habitats. We show that populations of shelf-dwelling sharks derive a substantial proportion of their carbon from regional pelagic sources, but contain individuals that forage within additional isotopically diverse local food webs, such as those supported by terrestrial plant sources, benthic production and macrophytes. In contrast, oceanic sharks seem to use carbon derived from between 30 degrees and 50 degrees of latitude. Global-scale compilations of stable isotope data combined with biogeochemical modelling generate hypotheses regarding animal behaviours that can be tested with other methodological approaches.