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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Cracking the cuisine: Invasive European shore crabs (Carcinus maenas) select a menu of soft-shelled mussels over cockles
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Cracking the cuisine: Invasive European shore crabs (Carcinus maenas) select a menu of soft-shelled mussels over cockles

机译：裂开这家美食：侵入式欧洲岸蟹（Carcinus Maenas）选择一个软壳贻贝的菜单

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摘要

The European shore crab, Carcinus maenas, is known to feed extensively on a variety of benthic species, and can affect commercially important bivalve fisheries. As a marine invasive species, predation by C. maenas can have ecological and commercial effects in its non-native range. We investigated potential predatory effects of nonindigenous C. maenas on native bivalves, and if shell strength of bivalve prey influenced predation susceptibility. The main prey species tested were ecosystem-engineering mussels (Mytilidae, Xenostrobus inconstans), and commercially valuable mud cockles (Veneridae, Katelysia peronii.). In separate field experiments, crabs were offered either a choice between both bivalve species or non-choice for each species separately. Male and female crabs equally consumed mussels across both choice and non-choice experiments. The proportion of cockles consumed was significantly lower than that of mussels in choice experiments, and no cockles were consumed in the non-choice experiment. Bivalve compressive shell strengths were tested separately with a universal testing machine. The breaking force required to crush shells of adult K. peronii was much higher than the claw strength of adult crabs, but the significantly lower shell-breaking forces required for X. inconstans make the mussels vulnerable prey. Additional compressive shell strength tests on other native bivalve species and juvenile Katelysia showed that they were susceptible to crab predation. Results indicate that predation by non-indigenous C. maenas on soft-shelled mussels and juvenile cockles could impact native bivalve abundances. Shell strength measurements of potential prey are a suitable approach to assess the risk for ecological and economic impacts of this globally invasive crab.
机译：欧洲岸蟹癌，Maenas，众所周知，在各种底栖物种上广泛喂养，并且可以影响商业上重要的双级渔业。作为海洋侵入性物种，C. Maenas的捕食在其非本地范围内可能具有生态和商业效果。我们调查了非indigenous C. maenas对天然双抗体的潜在掠夺性效果​​，以及壳体强度的双向捕食性捕食性易感性。测试的主要猎物物种是生态系统 - 工程贻贝（霉菌，Xenostrobus Inconsns），以及商业珍贵的泥蛤（Veneridae，Kideysia Peronii。）。在单独的现场实验中，螃蟹被分别为每种物种两分枝物种或不选择之间的选择。男性和雌性螃蟹在选择和非选择实验中同样消耗贻贝。所消耗的蛤蜊比例显着低于选择实验中的贻贝的比例，并且在不选择实验中没有消耗蛤蜊。与通用试验机分开测试双抗体压缩壳强度。挤压成人K. peronii壳所需的断裂力远高于成人螃蟹的爪强度，但X. X.Connsels脆弱的猎物所需的显着降低的壳体。对其他天然双原生物物种和青少年敏感症的额外压缩壳体强度试验表明它们易于蟹捕食。结果表明，在软壳贻贝和少年鸟蛤上的非土着C. maenas的捕食可能会影响天然双象的丰富。潜在猎物的壳体强度测量是评估全球侵入性螃蟹的生态和经济影响风险的合适方法。

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