Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (396.0 KB bytes)

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

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

Date: 2010

Source: General and Comparative Endocrinology. 169: 210-216.

Publication Series: Scientific Journal (JRNL)

Description:

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.

Keywords: androgens, fecal metabolites, lynx, non-invasive, seasonality, testosterone

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Fanson, Kerry, V.; Wielebnowski, Nadja C.; Shenk, Tanya M.; Jakubas, Walter J.; Squires, John R.; Lucas, Jeffrey R. 2010. Patterns of testicular activity in captive and wild Canada lynx (Lynx canadensis). General and Comparative Endocrinology

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.