Aggressive Interactions of the Endangered Nashville Crayfish, Orconectes shoupi
Aggressive Interactions of the Endangered Nashville Crayfish, Orconectes shoupi
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濒临灭绝的纳什维尔小龙虾 Orconectes shoupi 的攻击性相互作用
DOI：
10.1656/058.009.0211
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发表时间：
2010
期刊：
影响因子：
3
通讯作者：
Hayden T. Mattingly
中科院分区：
文献类型：
--
作者：
Emily A. Bizwell;Hayden T. Mattingly
摘要在实验室环境中，使用联邦保护（濒危）Orconectes shoupi（纳什维尔小龙虾）和两种同域物种，O. placidus和O. durelli（鞍小龙虾）。Orconectes placidus和O. durelli是O.通过竞争性或攻击性的相互作用。了解这种相互作用可以帮助解释物种分布，提供对其他威胁的见解，并指导管理决策有关纳什维尔小龙虾易位。侵略性的相互作用进行了检查与30分钟的录像带试验之间的身体大小匹配的异性和同种对。还分析了螯大小对攻击性相互作用结果的预测影响。结果表明，O.瘦皮公、母的攻击性均显著高于O. placidus。然而，O. durelli雌性比O.首皮女性。在一些体型匹配的物种和性别配对中检测到了螯肢大小的显著差异：O。雄性瘦皮蟹的螯肢比O. durelli雄性;和O.瘦皮雌蟹的螯肢比O. placidus雌性，螯形比O.杜雷利女性。虽然螯大小似乎发挥了主导作用，它不是唯一的因素影响侵略性的相互作用的结果。我们的实验室结果并没有发现对O. shoupi从O. placidus，因此不排除引入O. Shoupi进入栖息地占据O.以实现恢复计划的目标。然而，种间侵略在一个重要的资源（例如，食物或住所）没有在这里进行测试，应该进行调查，以提供更全面的评估可能的威胁O。手批。
Abstract Aggressive interactions, differences in chela size, and the effect of chela size on outcomes of aggressive interactions were studied in a laboratory setting using the federally protected (endangered) Orconectes shoupi (Nashville Crayfish), and two sympatric species, O. placidus (Bigclaw Crayfish) and O. durelli (Saddle Crayfish). Orconectes placidus and O. durelli are potential threats to O. shoupi through competitive or aggressive interactions. Understanding such interactions could help explain species distributions, provide insight on additional threats, and guide management decisions regarding Nashville Crayfish translocations. Aggressive interactions were examined with 30-min videotaped trials between body-size-matched hetero- and conspecific pairs. The predicted influence of chela size on outcomes of aggressive interactions was also analyzed. Our results demonstrated that O. shoupi males and females were significantly more aggressive than O. placidus. However, O. durelli females won more encounters and were slightly more aggressive than O. shoupi females. Significant differences in chela size were detected in some body-size-matched species and gender pairings: O. shoupi males had narrower chelae than O. durelli males; and O. shoupi females had longer and wider chelae than O. placidus females, and longer but narrower chelae than O. durelli females. Although chela size appeared to play a role in dominance, it was not the only factor influencing outcomes of aggressive interactions. Our laboratory results did not identify displacement threats to O. shoupi from O. placidus, and therefore do not preclude introduction of O. shoupi into habitat occupied by O. placidus to meet recovery plan objectives. However, interspecific aggression in the presence of a vital resource (e.g., food or shelter) was not tested here and should be investigated to provide a more comprehensive evaluation of possible threats to O. shoupi.