Inter-specific and ontogenic differences in δ13C and δ15N values and Hg and Cd concentrations in cephalopods
Inter-specific and ontogenic differences in δ13C and δ15N values and Hg and Cd concentrations in cephalopods
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DOI：
10.3354/meps09159
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发表时间：
2011-01-01
影响因子：
2.5
通讯作者：
Bustamante, P.
中科院分区：
文献类型：
--
作者：
Chouvelon, T.;Spitz, J.;Bustamante, P.
化学示踪剂（E。G.稳定同位素或微量金属）越来越多地用于研究海洋生物的营养生态学和食性，各种因素都可能影响其价值。本研究的目的是提供信息的个体发育的影响，稳定的碳和氮值（三角洲C-13和三角洲N-15）和镉（Cd）和汞（Hg）的浓度在5头足类动物比斯开湾（东北大西洋）。为此，属于3个物种的个体显示最广泛的大小进行了分析，肌肉三角洲C-13和三角洲N-15值和肌肉汞，和消化腺镉浓度。结果表明，稳定的同位素比值允许歧视的具体喂养策略在个体发育。分离之间的5头足类物种的营养生态也证明（不同的同位素生态位）。相比之下，汞浓度变化超过相同的数量级，在这5个头足类动物的物种，尽管更高的水平，在底栖章鱼Eledone。一致地，汞浓度遵循相同的个体发育模式，并随着头足类动物体型/年龄的增加而增加。最后，Cd浓度变化超过3个数量级之间的5种。尽管可能的生理影响，在金属的生物积累，镉浓度可能反映特定的喂养偏好或喂养区和个体发育的变异性在一个单一的物种。因此，个体发育的影响，必须考虑到碳和氮或微量金属的稳定同位素比值作为生态示踪剂时，最好的建议是集中在一个给定的类年龄。
Chemical tracers (e. g. stable isotopes or trace metals) are increasingly used to study trophic ecology and feeding habits of marine organisms and various factors can affect their values. The aim of the present study was to provide information on ontogenic effects on stable carbon and nitrogen values (delta C-13 and delta N-15) and on cadmium (Cd) and mercury (Hg) concentrations in 5 cephalopod species from the Bay of Biscay (North-East Atlantic Ocean). To this end, individuals belonging to 3 species showing the widest range of sizes were analysed for muscle delta C-13 and delta N-15 values and muscle Hg, and digestive gland Cd concentrations. Results showed that stable isotope ratios allowed discrimination of specific feeding strategies during ontogenesis. Segregation between 5 cephalopod species in terms of trophic ecology was also evidenced (different isotopic niches). In contrast, Hg concentrations varied over the same order of magnitude in these 5 cephalopod species, despite higher levels in the benthic octopus Eledone cirrhosa. Consistently, Hg concentrations followed the same ontogenic pattern and increased with increasing body size/age of cephalopods. Finally, Cd concentrations varied over 3 orders of magnitude among the 5 species. Despite possible effects of physiology in terms of metal bioaccumulation, Cd concentrations were likely to reflect specific feeding preferences or feeding zones and ontogenic variability within a single species. Thus, ontogenic effects have to be taken into account when stable isotope ratios of carbon and nitrogen or trace metals are used as ecological tracers; the best recommendation being to focus on a given class age.