Potential competitive impacts of the invasive Chinese mitten crab Eriocheir sinensis on native Japanese mitten crab Eriocheir japonica
Potential competitive impacts of the invasive Chinese mitten crab Eriocheir sinensis on native Japanese mitten crab Eriocheir japonica
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入侵中华绒螯蟹对本土日本绒螯蟹的潜在竞争影响
DOI：
10.1007/s10750-018-3759-9
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发表时间：
2019
期刊：
影响因子：
2.6
通讯作者：
Strussmann Carlos A.
中科院分区：
文献类型：
--
作者：
Zhang Zhixin;Yokota Masashi;Strussmann Carlos A.
中华绒螯蟹（Eriocheir sinensis）是一种外来入侵物种，对宿主生态系统构成了严重威胁。在日本，它被认为是一种入侵物种，最近在东京湾被发现，但很少有人知道它对本地物种的可能影响，特别是对同源的日本绒螯蟹（Eriocheir japonica）。本研究探讨了E. sinensisandE.在实验室条件下，庇护竞争试验进行了对本地和入侵男性在不同的大小组合。结果表明，两种植物之间的竞争是大小依赖的：E。japonica在与大小相当或稍大的E. sinensis;E.当其甲壳或螯足分别比E.日本。这两个物种表现出不同的行为模式：与E。sinensis、E.日本人经常表现出积极的行为（接近、步行腿接触、螯接触），很少表现出消极的行为（撤退）。我们的研究结果强调了强大的本土竞争对手在控制入侵成功和入侵的重要作用。sinensis可能不太可能排除native。japonica从它的栖息地通过直接竞争庇护。
The Chinese mitten crabEriocheir sinensisis an invasive species outside native range and represents a substantial threat to recipient ecosystems. It is regarded as an invasive species in Japan and has recently been found in Tokyo Bay, but little is known about its possible impacts on native species, especially on the congener Japanese mitten crabEriocheir japonica. This study examined shelter competition betweenE. sinensisandE. japonicaunder laboratory conditions. Shelter competition trials were conducted in pairs of native and invasive males in different size combinations. Our results indicated that competition between two species was size-dependent:E. japonicaalways successfully defended shelter when competing with size-matched or slightly largerE. sinensis;E. sinensisalways won shelter when its carapace or chela were at least 10 or 7% larger, respectively, than those ofE. japonica. The two species exhibited different behavioural patterns: compared withE. sinensis,E. japonicafrequently displayed positive behaviour (approach, walking leg contact, chela contact) and seldomly displayed negative behaviour (retreat). Our results highlight the important role of strong native competitors in controlling invasion success and suggestE. sinensismay be unlikely to exclude nativeE. japonicafrom its habitat by direct competition for shelter.
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