AVIS-IBIS

Birds of Indian Subcontinent

DDE Residues and Eggshell Thickness in Prairie Falcons

Publication Type:Journal Article
Year of Publication:1973
Authors:Enderson, JH, Wrege, PH
Journal:The Journal of Wildlife Management
Volume:37
Issue:4
Date Published:1973
ISBN Number:0022541X
Keywords:Falco, Falco mexicanus, Falco peregrinus, Falconidae, Pelecanidae, Pelecanus, Pelecanus occidentalis
Abstract:The eggshell thickness of prairie falcon (Falco mexicanus) eggs collected in Colorado in 1967-68, and 1972, is related linearily and inversely to the logarithms of the DDE content of the eggs. This relationship is not statistically different from that found in peregrine falcons (F. peregrinus) and brown pelicans (Pelecanus occidentalis). DDE levels in prairie falcon eggs are about one-fifth and one-sixteenth those shown in Alaskan peregrine eggs and California brown pelican eggs, respectively, and despite some shell thinning, prairie falcons in Colorado are reproducing well. Shell thickness averaged higher, egg DDE residues lower, and hatch rate was greater in 1972 than in 1967-68 in the prairie falcons, but the differences are not significant.
URL:http://www.jstor.org/stable/3800311
Short Title:The Journal of Wildlife Management
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