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Publication Information

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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: Journal/Magazine Article (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.

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Citation:


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.

 


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