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Investigating diet patterns of highly mobile marine predators using stomach contents, stable isotope, and fatty acid analyses

机译:使用胃内容物,稳定的同位素和脂肪酸分析研究高度活动的海洋捕食者的饮食模式

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Determining what animals eat is simultaneously challenging and yet also critical for ecologists, fisheries scientists, and resource managers. The tools of trophic ecology have expanded considerably in the last half century in pursuit of this goal. In this study, we combined stomach contents, stable isotope, and fatty acid analyses to investigate trophic patterns in three species of highly mobile, pelagic predators: striped marlin (Kajikia audax), blue marlin (Makaira nigricans), and common dolphinfish (Coryphaena hippurus). We were particularly interested in examining individual diet specialization among these species. We compared the short-term stomach contents with long-term diet proportions estimated from stable isotope ratios and fatty acid profiles using a Bayesian mixing model. Our results indicate that all three species feed on a mix of prey types. This work furthermore suggests that individuals of all three predator species demonstrate generalist feeding habits, with minimal differences in long-term (weeks, months) diet estimates between individuals with different short-term (hours, days) stomach contents. This novel, three-part analytical approach can elucidate complex and otherwise elusive trophic dynamics.
机译:确定动物吃什么同时具有挑战性,对于生态学家,渔业科学家和资源管理者而言也至关重要。为了实现这一目标,营养生态学的工具在过去半个世纪中得到了很大的发展。在这项研究中,我们结合了胃内容物,稳定同位素和脂肪酸分析,研究了三种流动性强的中上层捕食者的营养模式:条纹马林鱼(Kajikia audax),蓝马林鱼(Makaira nigricans)和普通海豚鱼(Coryphaena hippurus) )。我们对研究这些物种中的个体饮食专长特别感兴趣。我们使用贝叶斯混合模型比较了短期胃中含量和长期饮食比例,这些比例是根据稳定同位素比和脂肪酸谱估算的。我们的结果表明,这三种物种都以混合的猎物为食。这项工作进一步表明,所有三种捕食者的个体都表现出通俗的喂养习惯,而短期(小时,天)胃内容不同的个体之间的长期(几周,几个月)饮食估计差异最小。这种新颖的,由三部分组成的分析方法可以阐明复杂且难以捉摸的营养动力学。

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