AVIS-IBIS

Birds of Indian Subcontinent

ORGANOCHLORINE RESIDUES AND EGGSHELL THINNING IN THE PEREGRINE FALCON FALCO PEREGRINUS MINOR IN ZIMBABWE

Publication Type:Journal Article
Year of Publication:1995
Authors:Hartley, RR, Newton, I, Robertson, M
Journal:Ostrich
Volume:66
Issue:2-3
Date Published:1995
ISBN Number:0030-6525
Keywords:Falco, Falco peregrinus, Falconidae, Rhynchodon peregrinus, Zimbabwe
Abstract:Summary Hartley, R.R., Newton, I., geometric mean 1.8 ppm) was found in all eggs (n = 15) from 13 sites, including two pars in captivity. Eggs from two sites in the mid-Zambezi Valley, the most recently and heavily sprayed areas (5?8 times for tsetse fly Glossina sp. control), had the highest levels, one beyond that regarded as critical for successful reproduction. Mean shell thickness (Ratcliffe index) of the 1990 eggs was 10% (range = 2?29%) lower than the presumed pre-DDT mean. HEOD was detected in two eggs, HCB in one egg, and PCBs in all eggs, but at levels too low to affect breeding performance. Young were fledged from each of 12 sampled sites, yielding 1.86 young per site.Summary Hartley, R.R., Newton, I., geometric mean 1.8 ppm) was found in all eggs (n = 15) from 13 sites, including two pars in captivity. Eggs from two sites in the mid-Zambezi Valley, the most recently and heavily sprayed areas (5?8 times for tsetse fly Glossina sp. control), had the highest levels, one beyond that regarded as critical for successful reproduction. Mean shell thickness (Ratcliffe index) of the 1990 eggs was 10% (range = 2?29%) lower than the presumed pre-DDT mean. HEOD was detected in two eggs, HCB in one egg, and PCBs in all eggs, but at levels too low to affect breeding performance. Young were fledged from each of 12 sampled sites, yielding 1.86 young per site.
URL:http://www.tandfonline.com/doi/abs/10.1080/00306525.1995.9633762
Short Title:Ostrich
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