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タイトル: Asymmetry of mandibular dentition is associated with dietary specialization in snail-eating snakes
著者: Hoso, Masaki  kyouindb  KAKEN_id
著者名の別形: 細, 将貴
キーワード: Predation
Evolutionary novelty
Left-right asymmetry
Adaptation
Specialization
発行日: 2-Mar-2017
出版者: PeerJ
誌名: PeerJ
巻: 5
論文番号: e3011
抄録: Background: In vertebrates, the left-and-right pairs of homologous organs are generally present in equal numbers. A remarkable exception is snail-eating snakes in the family Pareidae: almost all the pareid snakes have much more teeth on the right mandible than on the left for functional specialization in feeding on the dextral majority of land snails. Because the only exceptional species with symmetric dentition has been regarded as a slug-eater, the extent of dietary specialization on slugs could shape the degree of the lateral asymmetry of mandibular dentition (dentition asymmetry) even among snail eaters. Methods: To test this, I compared the morphology and behavior of two sympatric species of Taiwanese snail-eating snakes, Pareas atayal and P. formosensis. Results: Specimens collected in the same locality showed that the dentition asymmetry of P. formosensis was significantly smaller than that of P. atayal. Congruent to its weak asymmetry, P. formosensis showed a strong preference of slugs to snails in the feeding experiment. Discussion: The dietary specialization of P. formosensis on slugs would contribute to niche partitioning from the sympatric congener P. atayal. This study suggests that the diverse variation in the dentition asymmetry of pareid snakes is the result of their dietary specialization and divergence.
記述: カタツムリ食をやめたヘビは歯並びが良い : 歯の本数における左右非対称性は、エサの違いで進化する. 京都大学プレスリリース. 2017-03-03.
著作権等: © 2017 Hoso. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
URI: http://hdl.handle.net/2433/218584
DOI(出版社版): 10.7717/peerj.3011
関連リンク: http://www.kyoto-u.ac.jp/ja/research/research_results/2016/170302_2.html
出現コレクション:学術雑誌掲載論文等

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