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首页> 外文期刊>Estuarine Coastal and Shelf Science >Laboratory analysis of the habitat occupancy of the crab Rhithropanopeus harrisii (Gould) in an invaded ecosystem: The north-eastern Baltic Sea
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Laboratory analysis of the habitat occupancy of the crab Rhithropanopeus harrisii (Gould) in an invaded ecosystem: The north-eastern Baltic Sea

机译：入侵的生态系统：波罗的海东北部的大闸蟹Rhithropanopeus harrisii（Gould）栖息地的实验室分析

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The Harris mud crab (Rhithropanopeus harrisii) arrived to the Baltic Sea in 1936. It was not until the late 2000es when the species considerably expanded its distribution area towards the northern Baltic Sea and formed a viable and expanding population. This introduction represents an appearance of a completely new function, as such larger epibenthic predators were previously missing from northeastern Baltic Sea. In order to assess potential impacts of the crab to the invaded ecosystem, knowledge of the crab habitat preferences is required. This study experimentally evaluated the habitat occupancy of the Harris mud crab. The crab stayed more in vegetated boulders compared to unvegetated boulders or sandy habitats. There was an interactive effect between the presence of prey and crab population density with prey availability increasing the crab's affinity towards less favored habitats when population densities were low. Increased aggression between crab individuals increased their affinity towards otherwise less occupied habitats. Less favored habitats were typically inhabited by smaller individuals and presence of prey increased occupancy of some habitats for larger crabs. The experiment demonstrated that the crab may inhabit a large variety of habitats with stronger affinity towards boulder fields covered with the brown macroalga Fucus vesiculosus. This implies stronger impact of crab in such habitats in the invaded ecosystem. (C) 2015 Elsevier Ltd. All rights reserved.
机译：哈里斯泥蟹（Rhithropanopeus harrisii）于1936年到达波罗​​的海。直到2000年代后期，该物种才将其分布范围大大扩展到北波罗的海，并形成了一个有生存能力且不断扩大的种群。这次介绍代表了一种全新功能的出现，因为以前波罗的海东北部缺少这种较大的表皮食肉动物。为了评估螃蟹对入侵生态系统的潜在影响，需要了解螃蟹栖息地的偏好。这项研究通过实验评估了哈里斯泥蟹的栖息地。与没有植被的巨石或沙质生境相比，螃蟹更多地留在有植被的巨石中。当种群密度较低时，猎物的存在与螃蟹的种群密度之间会产生相互作用，而猎物的可利用性会增加螃蟹对偏爱的栖息地的亲和力。螃蟹个体之间的侵略性增强，增加了它们对原本较少有人居住的栖息地的亲和力。偏爱的栖息地通常居住在较小的个体中，猎物的存在增加了较大螃蟹的某些栖息地的占有率。实验表明，螃蟹可能栖息于多种栖息地中，这些栖息地对覆盖有棕色大型藻（Fucus vesiculosus）的巨石田具有更强的亲和力。这意味着螃蟹在被入侵的生态系统中的这种栖息地中的影响更大。 （C）2015 Elsevier Ltd.保留所有权利。

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