Sequential isotopic signature along gladius highlights contrasted individual foraging strategies of jumbo squid (Dosidicus gigas).
Sequential isotopic signature along gladius highlights contrasted individual foraging strategies of jumbo squid (Dosidicus gigas).
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DOI：
10.1371/journal.pone.0022194
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Cherel Y
中科院分区：
文献类型：
--
作者：
Lorrain A;Argüelles J;Alegre A;Bertrand A;Munaron JM;Richard P;Cherel Y
鲸类在海洋生态系统中发挥着重要作用，但对其摄食生态的了解有限。特别是，在其使用资源的个体内和个体间的差异还没有得到充分的探讨，虽然有越来越多的证据表明，个别生物体可以在他们使用其栖息地和资源的方式有很大的不同。使用δ 13 C和δ 15 N值连续采样的剑尾鱼（档案组织），我们研究了高分辨率的变化，在营养生态位的5个大（>60厘米地幔长度）的巨型鱿鱼（Dosidicus gigas），收集了秘鲁海岸。我们报告的第一个证据大个体间的差异，在巨型鱿鱼觅食策略，没有系统的营养水平与大小的增加。总的来说，剑尾鱼的δ 13 C值表明在乌贼的一生中（大约8-9个月）有一次或几次迁移，在此期间δ 15 N值也有波动（范围：1至5‰）。一个个体的δ 15 N最终意外下降了4.6‰（超过一个营养级），这表明当时的猎物从高营养级向低营养级转变。这些数据说明了高多样性的猎物类型和觅食的历史，这个物种在个人层面上。的同位素签名gladii被证明是一个强大的工具，描绘高分辨率和个体发育的变化，在个别觅食策略的鱿鱼，从而补充了传统的信息提供胃内容物分析和稳定同位素的代谢活性组织。所观察到的生活史策略的差异突出了巨型鱿鱼的高度可塑性及其适应环境变化的高潜力。
Cephalopods play a major role in marine ecosystems, but knowledge of their feeding ecology is limited. In particular, intra- and inter-individual variations in their use of resources has not been adequatly explored, although there is growing evidence that individual organisms can vary considerably in the way they use their habitats and resources. Using δ13C and δ15N values of serially sampled gladius (an archival tissue), we examined high resolution variations in the trophic niche of five large (>60 cm mantle length) jumbo squids (Dosidicus gigas) that were collected off the coast of Peru. We report the first evidence of large inter-individual differences in jumbo squid foraging strategies with no systematic increase of trophic level with size. Overall, gladius δ13C values indicated one or several migrations through the squid's lifetime (∼8–9 months), during which δ15N values also fluctuated (range: 1 to 5‰). One individual showed an unexpected terminal 4.6‰ δ15N decrease (more than one trophic level), thus indicating a shift from higher- to lower-trophic level prey at that time. The data illustrate the high diversity of prey types and foraging histories of this species at the individual level. The isotopic signature of gladii proved to be a powerful tool to depict high resolution and ontogenic variations in individual foraging strategies of squids, thus complementing traditional information offered by stomach content analysis and stable isotopes on metabolically active tissues. The observed differences in life history strategies highlight the high degree of plasticity of the jumbo squid and its high potential to adapt to environmental changes.
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影响因子：
4.8
作者：
Newsome, Seth D.;Tinker, M. Tim;Estes, James A.
通讯作者：
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