Do predators prefer toxic animals?A case of chemical discrimination by an Asian snake that sequesters firefly toxins  

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作  者:Masaya FUKUDA Rinako UJIIE Takato INOUE Qin CHEN Chengquan CAO Li DING Naoki MORI Akira MORI 

机构地区:[1]Department of Zoology,Graduate School of Science,Kyoto University,Kyoto 606-8502,Japan [2]Department of Applied Life Science,Graduate School of Agriculture,Kyoto University,Kyoto 606-8502,Japan [3]Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,Sichuan 610041,China [4]College of Life Sciences,Leshan Normal University,Leshan,Sichuan 614000,China

出  处:《Current Zoology》2022年第6期627-634,共8页动物学报(英文版)

基  金:This study was supported in part by Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research(17H03719,18KK0205,and 21H02551).

摘  要:Several Asian natricine snakes of the genus Rhabdophis feed on toads and sequester steroidal cardiac toxins known as bufadienolides(BDs)from them.A recent study revealed that species of the Rhabdophis nuchalis Group ingest lampyrine fireflies to sequester BDs.Although several species of fireflies are distributed in the habitat of the R.nuchalis Group,only lampyrine fireflies,which have BDs,are included in the diet of these snakes.Thus,we hypothesized that the R.nuchalis Group chemically distinguishes fireflies that have BDs from those that do not have BDs.We also predicted that the R.nuchalis Group detects BDs as the chemical cue of toxin source.To test these predictions,we conducted 3 behavioral experiments using Rhabdophis chiwen,which belongs to the R.nuchalis Group.In the first experiment,R.chiwen showed a moderate tongue flicking response to cinobufagin,a compound of BDs.On the other hand,the snake showed a higher response to the chemical stimuli of lampyrine fireflies(BD fireflies)than those of lucioline fireflies(non-BD fireflies).In the second experiment,in which we provided live BD and non-BD fireflies,the snake voluntarily consumed only the former.In the third,a Y-maze experiment,the snake tended to select the chemical trail of BD fireflies more frequently than that of non-BD fireflies.These results demonstrated that R.chiwen discriminates BD fireflies from non-BD fireflies,but the prediction that BDs are involved in this discrimination was not fully supported.To identify the proximate mechanisms of the recognition of novel toxic prey in the R.nuchalis Group,further investigation is necessary.

关 键 词:BUFADIENOLIDES chemical preference FIREFLIES Rhabdophis toxin sequestration 

分 类 号:P22[天文地球—大地测量学与测量工程]

 

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