Evolution of the nuchal glands in snakes: origin, diversification, and secondary loss
| Project/Area Number |
26440213
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Kyoto University |
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Principal Investigator |
Mori Akira 京都大学, 理学研究科, 准教授 (80271005)
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| Co-Investigator(Renkei-kenkyūsha) |
Hirohiko Takeuchi 京都大学, 大学院理学研究科, ポスドク (40726444)
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| Research Collaborator |
Mori Naoki 京都大学, 大学院農学研究科, 教授
Savitzky Alan H. ユタ州立大学, 教授
Tang Yezhong 成都生物研究所, 教授
Li Ding 成都生物研究所, 准教授
Tsai Tein-shun 台湾国立ピントン科技大学, 助手
Nguyen Tao Thien ベトナム国立自然博物館, 研究員
Das Indraneil マレーシア大学ボルネオ校, 教授
Silva Anslem de ペラデニア大学, 客員講師
Mahaulpatha Dharshani スリジャヤワルダナプラ大学, 上級講師
Jono Teppei 成都生物研究所, ポスドク研究員
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 進化 / 行動学 / 爬虫類学 / 防御行動 / 化学防衛 / ヘビ類 / 餌毒 / 防御機構 / 頸腺 / 国際研究者交流 / へビ類 |
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| Outline of Final Research Achievements |
Rhabdophis tigrinus has peculiar defensive organs, called nuchal glands. This snake eats toads, which have toxic skin secretions, and sequesters the toxins to store in its glands. This species also shows peculiar defensive displays that enhance the effectiveness of the toxins for predator avoidance.
We confirmed the presence of similar organs in a total of 18 species of natricine snakes, which show diversified morphological features in the organs. Based on the molecular phylogenetic analysis, we inferred that the nuchal gland system has evolved only once in the ancestor of these species. A line of evidence we obtained suggests that some of those species, which mainly feed on earthworms, have changed the dietary source of nuchal gland toxins from toads to fireflies.
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Report
(4 results)
Research Products
(33 results)
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[Journal Article] Taxonomic Validity and Phylogeography of the East Eurasian Natricine Snake, <i>Rhabdophis lateralis</i> (Berthold, 1859) (Serpentes: Colubridae), as Inferred from Mitochondrial DNA Sequence Data2014
Author(s)
Takeuchi, H. , G.-X. Zhu, L. Ding, Y. Tang, H. Ota, A. Mori, H.-S. Oh, and T. Hikida
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Journal Title
Current Herpetology
Volume: 33
Issue: 2
Pages: 148-153
DOI
NAID
ISSN
1345-5834, 1881-1019
Related Report
Peer Reviewed
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[Presentation] Nuchal gland system: a novel defensive mechanism evolved in Asian natricine snakes2016
Author(s)
Akira Mori, Teppei Jono, Hirohiko Takeuchi, Tatsuya Yoshida, Li Ding, Anslem de Silva, Tein-Shun Tsai, Tao Thien Nguyen, W. A. D Mahaulpatha, Indraneil Das, Guang-xiang Zhu, Yezhong Tang, Naoki Mori, Alan Savitzky, Gordon Burghardt
Organizer
8th World Congress of Herpetology
Place of Presentation
杭州（中国）
Year and Date
2016-08-20
Related Report
Int'l Joint Research
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[Presentation] Evolution of a special organ, nuchal gland, based on a molecular phylogeny of the Eurasian natricine snakes (Serpentes: Colubridae)2016
Author(s)
Hirohiko Takeuchi, Akira Mori, Li Ding, Anslem de Silva, Indraneil Das, Tao Thien Nguyen, Tein-Shun Tsai, Teppei Jono, Guang-xiang Zhu, Dalshani Mahaulpatha, Ye-zhong Tang, Alan H. Savitzky
Organizer
8th World Congress of Herpetology
Place of Presentation
杭州（中国）
Year and Date
2016-08-20
Related Report
Int'l Joint Research
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[Presentation] アジア産ユウダ亜科ヘビ類における頸背腺の形態の多様性と進化2015
Author(s)
城野哲平, 竹内寛彦, Anslem de Silva, Tein-Shun Tsai, Indraneil Das, Nguyen Thien Tao, Dharshani Mahaulpatha, Shi Hai-Tao, Yezhong Tang
Organizer
日本爬虫両棲類学会第54回大会
Place of Presentation
東邦大学理学部（千葉県船橋市）
Year and Date
2015-12-06
Related Report
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[Presentation] The nucho-dorsal glands of Asian natricine snakes: Correlated evolution among diet, morphology, antipredator behavior, and defensive chemistry2015
Author(s)
Akira Mori, Hirohiko Takeuchi, Teppei Jono, Tatsuya Yoshida, Li Ding, Anslem de Silva, Tein-Shun Tsai, Tao Thien Nguyen, Dharshani Mahaulpatha, Indraneil Das, Yezhong Tang, Naoki Mori, Alan H. Savitzky, and Gordon M. Burghardt
Organizer
34th International Ethological Conference
Place of Presentation
ケアンズ（オーストラリア）
Year and Date
2015-08-12
Related Report
Int'l Joint Research
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