Chemoecology

, Volume 22, Issue 3, pp 187–198 | Cite as

Nuchal glands: a novel defensive system in snakes

  • Akira Mori
  • Gordon M. Burghardt
  • Alan H. Savitzky
  • Kathleen A. Roberts
  • Deborah A. Hutchinson
  • Richard C. Goris
Review

Abstract

Of the various chemical defensive adaptations of vertebrates, nuchal glands are among the most unusual. First described in a Japanese natricine snake, Rhabdophis tigrinus, in 1935, these organs are embedded under the skin of the neck region as a series of paired glands that have neither lumina nor ducts. The major chemical components of the glandular fluid are bufadienolides, which are cardiotonic steroids also found in the skin secretion of toads. Here we review early studies of nuchal glands and briefly introduce our recent findings on the sequestration of bufadienolides from consumed toads and the maternal provisioning of those sequestered compounds. We summarize behavioral studies associated with the antipredator function of the nuchal glands, which have been conducted during our more than decade-long collaboration. Results of preliminary analyses on the possible costs of toad-eating and on the ultrastructure of the nuchal glands are also presented. Finally, we discuss the evolutionary origin of the nuchal glands and suggest future directions designed to understand the biological importance of these novel vertebrate organs, which have evolved in a limited number of snake species.

Keywords

Rhabdophis tigrinus Bufo Dietary sequestration Antipredator behavior Bufadienolide Natricine snakes 

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Copyright information

© Springer Basel AG 2011

Authors and Affiliations

  • Akira Mori
    • 1
  • Gordon M. Burghardt
    • 2
  • Alan H. Savitzky
    • 3
  • Kathleen A. Roberts
    • 3
    • 5
  • Deborah A. Hutchinson
    • 3
    • 6
  • Richard C. Goris
    • 4
  1. 1.Department of Zoology, Graduate School of ScienceKyoto UniversityKyotoJapan
  2. 2.Departments of Psychology and Ecology and Evolutionary BiologyUniversity of TennesseeKnoxvilleUSA
  3. 3.Department of Biological SciencesOld Dominion UniversityNorfolkUSA
  4. 4.KawasakiJapan
  5. 5.Department of Natural Resources and Environmental SciencesAlabama A & M UniversityNormalUSA
  6. 6.Department of BiologyCoastal Carolina UniversityConwayUSA

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