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首页> 外文期刊>Marine ecology progress series >Long-term dietary segregation of common dolphins Delphinus delphis in the Bay of Biscay, determined using cadmium as an ecological tracer
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Long-term dietary segregation of common dolphins Delphinus delphis in the Bay of Biscay, determined using cadmium as an ecological tracer

机译：利用镉作为生态示踪剂确定比斯开湾海豚的长期饮食隔离

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Dietary studies in marine mammals are traditionally performed by stomach contents analyses, which may be insufficient to determine long-term dietary preferences of these upper level predators. Our primary objective was to test the efficiency of trace metal measurements as complementary tools in dietary studies. Variations in cadmium (Cd) exposure through the diet and its effective renal levels in the short-beaked common dolphin Delphinus delphis were investigated to study the long-term feeding ecology of this predator in the neritic and oceanic waters of the Bay of Biscay. Based upon previous stomach contents analyses, the main prey occurring in the diet of common dolphins were analysed for their Cd contents. Results showed that cephalopods, and especially oceanic Cranchids and Histioteuthids, constituted a major source of Cd for common dolphins. Estimated Cd intake would therefore be 12 times higher in oceanic common dolphins (1400 ± 65 μg d~(-1)) compared to neritic ones (120 ± 30 μg d~(-1)). Accumulation of renal Cd concentrations with age was 5 times higher in by-caught oceanic dolphins than neritic ones (p < 0.0001). Within the neritic area, renal Cd accumulation rate was 2 times higher in by-caught individuals compared to stranded ones (p = 0.002). Thus, the use of Cd concentrations in by-caught dolphins proved efficient for assessing the existence of dietary segregation between neritic and oceanic common dolphins from the Bay of Biscay. However, using Cd data to make inferences about the feeding ecology of stranded animals should be considered cautiously.
机译：传统上，海洋哺乳动物的饮食研究是通过胃内容物分析来进行的，这可能不足以确定这些上层捕食者的长期饮食偏好。我们的主要目标是测试饮食研究中微量金属作为补充工具的效率。在短喙普通海豚德尔菲（Delphinus delphis）中，通过饮食摄入镉（Cd）的变化及其有效肾脏水平进行了研究，以研究该捕食者在比斯开湾的白垩纪和海洋水域的长期摄食生态。根据以前的胃内容物分析，分析了普通海豚饮食中主要的猎物的镉含量。结果表明，头足类动物，尤其是海洋的Cranchids和Histoteuthids，是普通海豚Cd的主要来源。因此，海洋普通海豚（1400±65μgd〜（-1））的估计Cd摄入量要比野生海豚（120±30μgd〜（-1））高12倍。随着年龄的增长，被捕获的海豚体内肾脏中Cd的含量要比未接触者高5倍（p <0.0001）。在受累区域内，被困人员的肾脏Cd积累率是被困人员的2倍（p = 0.002）。因此，事实证明，在捕获的海豚中使用Cd浓度可以有效地评估比斯开湾的海豚和海豚之间的饮食隔离。但是，应谨慎考虑使用Cd数据推断滞留动物的摄食生态。

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