Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis)

Kerry V. Fanson, Nadja C. Wielebnowski, Tanya M. Shenk, Walter J. Jakubas, John R. Squires, Jeffrey R. Lucas

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Canada lynx are listed as a threatened species in the contiguous US. Understanding the reproductive characteristics (i.e., mating system, behavior, physiology) of a species is useful for ensuring effective in situ and ex situ management plans. The goal of this study was to describe patterns of androgen expression in both captive and wild male Canada lynx using fecal hormone metabolite analysis. Among captive lynx, juvenile and castrated males had lower concentrations of fecal androgens (fA) than intact males, thereby demonstrating that the assay detects biologically meaningful differences in testicular activity. We found that captive males in general had much higher fA levels than wild males. All males showed strong seasonal variation in fA concentrations, with significantly higher levels being expressed during the breeding season (February and March) than during the non-breeding season. Among captive males, variation in seasonal fA levels did not correlate with latitude. Finally, males housed with intact cage-mates (either male or female) had significantly higher fA levels than males housed alone or with a neutered cage-mate.

LanguageEnglish
Pages210-216
Number of pages7
JournalGeneral and Comparative Endocrinology
Volume169
Issue number3
DOIs
Publication statusPublished - 2010

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Lynx
Canada
androgens
Androgens
cages
seasonal variation
Lynx lynx
Lynx canadensis
Endangered Species
threatened species
mating systems
Breeding
breeding season

Keywords

  • Androgens
  • Fecal metabolites
  • Lynx
  • Non-invasive
  • Seasonality
  • Testosterone

Cite this

Fanson, K. V., Wielebnowski, N. C., Shenk, T. M., Jakubas, W. J., Squires, J. R., & Lucas, J. R. (2010). Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis). General and Comparative Endocrinology, 169(3), 210-216. https://doi.org/10.1016/j.ygcen.2010.09.001
Fanson, Kerry V. ; Wielebnowski, Nadja C. ; Shenk, Tanya M. ; Jakubas, Walter J. ; Squires, John R. ; Lucas, Jeffrey R. / Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis). In: General and Comparative Endocrinology. 2010 ; Vol. 169, No. 3. pp. 210-216.
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Fanson, KV, Wielebnowski, NC, Shenk, TM, Jakubas, WJ, Squires, JR & Lucas, JR 2010, 'Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis)', General and Comparative Endocrinology, vol. 169, no. 3, pp. 210-216. https://doi.org/10.1016/j.ygcen.2010.09.001

Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis). / Fanson, Kerry V.; Wielebnowski, Nadja C.; Shenk, Tanya M.; Jakubas, Walter J.; Squires, John R.; Lucas, Jeffrey R.

In: General and Comparative Endocrinology, Vol. 169, No. 3, 2010, p. 210-216.

Research output: Contribution to journalArticleResearchpeer-review

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