Competition for shelter occupancy between a native freshwater crab and an invasive crayfish
Competition for shelter occupancy between a native freshwater crab and an invasive crayfish
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DOI：
10.1007/s10452-015-9522-7
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发表时间：
2015-09-01
期刊：
影响因子：
1.8
通讯作者：
Sfenthourakis, Spyros
中科院分区：
文献类型：
--
作者：
Savvides, Pantelis;Louca, Vasilis;Sfenthourakis, Spyros
由于人类活动（主要是杀虫剂的使用）导致溪蟹栖息地的退化，溪蟹的种群数量显著减少。今天，P. potamios受到塞浦路斯法律的保护，但关于与引进和入侵的淡水小龙虾Procambarus clarkii相互作用对该物种可能产生的影响，目前还没有太多的信息。我们测试了这一假设，即入侵的小龙虾P. clarkii可能会对塞浦路斯唯一的土著淡水蟹P. potamios的种群造成负面影响，通过对住所的竞争。在实验室条件下进行了溪蟹与克氏原螯虾之间争夺庇护所的竞争试验。在实验过程中，对来自每个物种的相同大小的个体进行了评估，以评估其攻击性，在战斗中的统治地位和住所占领。结果表明，尽管这两个物种都具有类似的攻击性，但小龙虾比螃蟹赢得更多的战斗，更有效地占据庇护所。尽管目前还没有证据表明这两个物种是共位的，但这些结果表明，外来入侵的小龙虾可能对土著螃蟹产生负面影响，它们可能在未来成为共位的。
Potamon potamios populations have decreased significantly due to the degradation of its habitat caused by human activities, mainly the use of insecticides. Today, P. potamios is protected by Cypriot law, but not much information is known regarding possible effects on the species from interactions with the introduced and invasive freshwater crayfish Procambarus clarkii. We tested the hypothesis that the invasive crayfish P. clarkii can cause negative effects on the populations of the only indigenous freshwater crab of Cyprus P. potamios, through agonistic competition for shelter. A laboratory experiment on the competition between P. potamios and P. clarkii for securing shelter has been performed. During the experiment, pairs of equal-sized individuals from each species were evaluated for aggressiveness, domination in fights and shelter occupation. Results showed that even though both species are similarly aggressive, the crayfish wins more fights and occupies shelter more efficiently than the crab. Even though at present there is no evidence that the two species are syntopic, these results are indicative of possible negative effects of the alien invasive crayfish on the indigenous crab where they may become syntopic in the future.