Transition from sea to land: olfactory function and constraints in the terrestrial hermit crab Coenobita clypeatus.
Transition from sea to land: olfactory function and constraints in the terrestrial hermit crab Coenobita clypeatus.
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DOI：
10.1098/rspb.2012.0596
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发表时间：
2012-09-07
期刊：
影响因子：
--
通讯作者：
Hansson BS
中科院分区：
文献类型：
--
作者：
Krång AS;Knaden M;Steck K;Hansson BS
识别环境中的化学线索的能力对大多数动物来说是必不可少的。除了海洋幼虫阶段，anomuran土地寄居蟹（Coenobita）已经演变成不同程度的terrestriality，因此代表了一个很好的机会，调查适应所需的嗅觉系统从水生到陆生的成功过渡。虽然Coenobita的中央嗅觉系统具有卓越的处理能力，并且它们的嗅觉系统显然在陆地上发挥作用，但实际上对检测到的气味类型一无所知。本文利用触角电位（EAG）技术记录了大唇盲蝽（Coenobita clypeatus）的嗅觉反应谱。有趣的是，不同的化学基团引起了相反极性的EAG反应，这也出现了Coenobita compressus和密切相关的海洋寄居蟹Pagurus bernhardus。此外，在双选择生物测定中，C. clypeatus，我们发现水蒸气对于天然和合成气味剂诱导吸引或排斥至关重要。引人注目的是，在较高湿度下，C. clypeatus，而没有这样的效果出现在陆地醋蝇果蝇。总之，我们的研究结果表明，Coenobita嗅觉系统是有限数量的水溶性气味，高湿度是最关键的功能。
The ability to identify chemical cues in the environment is essential to most animals. Apart from marine larval stages, anomuran land hermit crabs (Coenobita) have evolved different degrees of terrestriality, and thus represent an excellent opportunity to investigate adaptations of the olfactory system needed for a successful transition from aquatic to terrestrial life. Although superb processing capacities of the central olfactory system have been indicated in Coenobita and their olfactory system evidently is functional on land, virtually nothing was known about what type of odourants are detected. Here, we used electroantennogram (EAG) recordings in Coenobita clypeatus and established the olfactory response spectrum. Interestingly, different chemical groups elicited EAG responses of opposite polarity, which also appeared for Coenobita compressus and the closely related marine hermit crab Pagurus bernhardus. Furthermore, in a two-choice bioassay with C. clypeatus, we found that water vapour was critical for natural and synthetic odourants to induce attraction or repulsion. Strikingly, also the physiological response was found much greater at higher humidity in C. clypeatus, whereas no such effect appeared in the terrestrial vinegar fly Drosophila melanogaster. In conclusion, our results reveal that the Coenobita olfactory system is restricted to a limited number of water-soluble odourants, and that high humidity is most critical for its function.
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DOI：
10.1016/s0022-0981(01)00330-6
发表时间：
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影响因子：
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