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Home ยป DDE Residues and Eggshell Thickness in Prairie Falcons
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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