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首页> 外文期刊>Aquatic Living Resources >The structure of subtidal food webs in the northern Gulf of St. Lawrence, Canada, as revealed by the analysis of stable isotopes
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The structure of subtidal food webs in the northern Gulf of St. Lawrence, Canada, as revealed by the analysis of stable isotopes

机译：分析稳定同位素后揭示了加拿大圣劳伦斯湾北部潮汐食物网的结构

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摘要

We analyzed stable isotopes of carbon and nitrogen to investigate the trophic structure of the subtidal food web around the Mingan Islands, northern Gulf of St. Lawrence, eastern Canada. All benthic consumers were enriched in C-13 (mean delta C-13 of -17.1 parts per thousand) compared to particulate organic matter (POM: -23.3 parts per thousand). Nitrogen stable isotope ratios ranged from 6 parts per thousand to 14 parts per thousand and the organisms studied fell into three distinct trophic groups, primary producers, primary consumers (herbivores), and predators. The sea star Crossaster papposus and the sculpin Myoxocephalus scorpius, known to be top level predators, had slightly higher delta N-15 than other predators. Although the average isotope signature of the sea star Solaster endeca placed it among regular predators, the delta N-15 increased with sea star size and large individuals could be considered as top predators. The relatively small number of organisms located at intermediate trophic levels suggests a low level of omnivory in the Mingan Islands' system, which contrasts with previously described benthic systems that exhibit a continuum between herbivores and predators. Low omnivory, in addition to low diversity, suggests that this ecosystem may be relatively unstable if exposed to natural and/or anthropogenic disturbances such as exploitation and climate change.
机译：我们分析了碳和氮的稳定同位素，以研究加拿大东部圣劳伦斯湾北部Mingan群岛周围潮间带食物网的营养结构。相较于颗粒有机物（POM：-23.3千分之一），所有底栖生物消费者都富含C-13（平均C-13千分之-17.1）。氮的稳定同位素比率范围从千分之六到千分之十四，所研究的生物分为三个不同的营养组，即主要生产者，主要消费者（食草动物）和捕食者。海星Crossaster papposus和sculpin Myoxocephalus scorpius被称为顶级掠食者，其N-15三角洲比其他掠食者略高。尽管海星Solaster endeca的平均同位素特征使它成为常规的捕食者，但随着海星大小的增加，N-15增量也增加了，大个体被认为是顶级捕食者。位于营养中期的生物数量相对较少，这表明明安群岛系统的杂食动物水平较低，这与先前描述的底栖生物系统形成鲜明对比，底栖生物系统在食草动物和掠食者之间表现出连续性。除多样性低外，杂食性低表明该生态系统如果受到自然和/或人为干扰（例如开发和气候变化）的影响，可能会相对不稳定。

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