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首页> 外文期刊>Marine ecology progress series >Trophic niche of the invasive red king crab Paralithodes camtschaticus in a benthic food web
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Trophic niche of the invasive red king crab Paralithodes camtschaticus in a benthic food web

机译：底栖食物网中入侵性红帝王蟹Paralithodes camtschaticus的营养位

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摘要

Understanding the trophic ecology of an invasive species is important for risk assessment. The red king crab Paralithodes camtschaticus is both a valuable fishery resource and a potential threat to native biota in the Barents Sea. We combined gut content analysis and stable carbon and nitrogen isotope analysis to study feeding strategy, variation in resource use and niche overlap within the benthic food web of Porsangerfjord (70.1 degrees to 70.9 degrees N, 25 degrees to 26.5 degrees E) on the northern Norwegian coast. This fjord has experienced recent invasion by the red king crab. Sediment-dwelling bivalves and polychaetes dominated gut contents of the red king crab with respect to occurrence, and the wide range of prey from multiple trophic levels revealed a generalist, opportunistic feeding strategy. There were differences in diet related to crab size and foraging location, reflecting habitat choice and depth distribution of crabs during their life cycle. Small crabs, feeding in shallow water, relied to a larger extent on littoral species such as sea urchins and gastropods. The estimated mean trophic level for red king crab in Porsangerfjord was 3.1 (range 2.7-3.5). There was no evidence of a pronounced ontogenetic niche shift in stable isotopes, with local effects concealing possible overall size effects. Competition may arise with native anomuran species (e.g. Lithodes maja), large predatory asteroids and gastropods, all of which overlapped with red king crab in isotopic niche. A low overlap in isotopic niche between red king crab and fish suggests that they exploit different major food resources and that predatory fish occupy a higher trophic position than the red king crab in Porsangerfjord.
机译：了解入侵物种的营养生态学对于风险评估很重要。红色帝王蟹Paralithodes camtschaticus既是宝贵的渔业资源，又是对巴伦支海本地生物群系的潜在威胁。我们结合了肠道含量分析和稳定的碳氮同位素分析，研究了挪威北部波森格峡湾底栖食物网（北纬70.1度至70.9度，东经25度至26.5度）的摄食策略，资源利用变化和生态位重叠。海岸。该峡湾最近经历了红色帝王蟹的入侵。从沉积情况来看，居住在沉积物中的双壳类动物和多毛类动物占主导地位，而且从多个营养级出发，范围广泛的猎物揭示了一种通才，机会主义的喂养策略。饮食的差异与蟹的大小和觅食位置有关，反映了蟹在其生命周期中的栖息地选择和深度分布。以浅水为食的小螃蟹在很大程度上依靠海胆和腹足纲等沿海物种。 Porsangerfjord中红帝王蟹的估计平均营养水平为3.1（范围为2.7-3.5）。没有证据表明稳定同位素的明显的生源生态位转移，局部效应掩盖了可能的总体规模效应。天然无尾目物种（例如Lithodes maja），大型掠食性小行星和腹足动物可能会竞争，所有这些都与同位素生态位中的红色帝王蟹重叠。红帝王蟹和鱼类之间的同位素生态位重叠低，表明它们利用不同的主要食物资源，掠食性鱼类的营养位置比波旁厄尔峡湾中的红帝王蟹更高。

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