Journal of Chemical Ecology

, Volume 8, Issue 5, pp 809–819 | Cite as

Castor sacs and anal glands of the north american beaver (Castor canadensis): their histology, development, and relationship to scent communication

  • Jon M. Walro
  • Gerald E. Svendsen
Article

Abstract

Both sexes of beavers possess a pair of castor sacs and a pair of anal glands located in paired subcutaneous cavities between the pelvis and the base of the tail. The castor sacs are not glandular in the histological sense, hence references to these structures as preputial glands or castor glands are misnomers. The wall of the castor sacs is plicate and comprised of three distinct zones: an outer layer of vascular connective tissue, a two-to five-cell-thick layer of mitotic epithelial cells, and several densely packed layers of cornified epithelium which grade into more widely separated sheets toward the lumen. Monocultures of a gram-positive facultatively anaerobic bacterium were present in the lumen of all castor sac preparations. Differences in the frequency of castoreum deposition were not attributable to differences in the structure of the castor sacs. The anal glands of beavers are holocrine sebaceous glands. These glands develop more rapidly than the castor sacs. Anal gland tissue from embryos exhibited cellular characteristics associated with the production of sebum. Secretory activity was evident in all preparations. The relationship of castoreum and anal gland secretion to scent communication among beavers is discussed.

Key words

Castor canadensis castor sacs anal glands chemical communication 

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References

  1. Albone, E.S., Gosden, P.E., andWare, G.C. 1976. Bacteria as a source of chemical signals in mammals, pp. 35–43,in D. Müller-Schwarze and M. Mozell (eds.). Chemical Signals in Vertebrates. Plenum Press, New York, 609 pp.Google Scholar
  2. Aleksiuk, M. 1968. Scent mound communication, territoriality, and population regulation in beavers (Castor canadensis Kuhl).J. Mammal. 49:759–762.Google Scholar
  3. Brady, C.A., andSvendsen, G.E. 1981. Social behaviour in a family of beaver,Castor canadensis.Biol. Behav. 6:99–114.Google Scholar
  4. Brown, J.C., andWilliams, J.D. 1972. The rodent preputial gland.Mammal. Rev. 2:105–147.Google Scholar
  5. Butler, R.G., andButler, L.A. 1979. Toward a functional interpretation of scent marking in the beaver (Castor canadensis).Behav. Neurol. Biol. 26:442–454.Google Scholar
  6. Goldschmidt, H., andKlingman, A.M. 1964. Quantitative estimation of keratin production by the epidermis.Arch. Dermatol. 88:709–712.Google Scholar
  7. Hodgdon, H.E. 1978. Social dynamics and behavior within an unexploited beaver (Castor canadensis) population. Unpublished PhD dissertation, University of Massachusetts, Amherst. 292 pp.Google Scholar
  8. Humason, G.L. 1967. Animal Tissue Techniques. W.H. Freeman, San Francisco, 569 pp.Google Scholar
  9. Kacnelson, Z.S., andOrlova, I.I. 1954. The histological structure of the preputial glands of an adult beaver.Voronezj 5:58–63 (in Russian).Google Scholar
  10. Müller-Schwarze, D., andHeckman, S. 1980. The social role of scent marking in beaver (Castor canadensis).J. Chem. Ecol. 6:81–95.Google Scholar
  11. Svendsen, G.E. 1978. Castor and anal glands of the beaver (Castor canadensis).J. Mammal. 59:618–620.Google Scholar
  12. Svendsen, G.E. 1980. Patterns of scent-mounding in a population of beaver (Castor canadensis).J. Chem. Ecol. 6:133–148.Google Scholar
  13. Wilsson, L. 1971. Observations and experiments on the ethology of the European beaver (Castor fiber L.)Viltrevy 8:116–261.Google Scholar

Copyright information

© Plenum Publishing Corporation 1982

Authors and Affiliations

  • Jon M. Walro
    • 1
  • Gerald E. Svendsen
    • 1
  1. 1.Department of Zoology and MicrobiologyOhio UniversityAthens

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