Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

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

(202) 205-8333

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

Publication Information

View PDF (196 KB)

Title: Eggshell quality and organochlorine residues in eggs of merlins, Falco columbarius, in southeastern Montana

Author: Becker, Dale M.; Sieg, Carolyn Hull;

Date: 1987

Source: Canadian Field-Naturalist. 101(3): 369-372.

Publication Series: Scientific Journal (JRNL)

Description: Eggshell weight and thickness indices of Richardson’s Merlin (Falco columbarius richardsonii) eggs collected in southeastern Montana were significantly (p < 0.01) lower than pre-1946 samples. Montana eggshells showed reductions of 13% in shell weight and 20% in shell thickness indices when compared to eggshells collected before 1946. The decreased eggshell weights and thickness indices and the occurrence of 7 organochlorine compounds in Merlin eggs recently collected in southeastern Montana indicates that this raptor population merits periodic monitoring.

Keywords: 0rganochlorines, Merlin, Falco columbarius, pesticides, Montana

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.



Becker, Dale M.; Sieg, Carolyn Hull 1987. Eggshell quality and organochlorine residues in eggs of merlins, Falco columbarius, in southeastern Montana. Canadian Field-Naturalist. 101(3): 369-372.


 [ 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.