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White-faced ibis DDE-related reproductive problems continue at Carson Lake, Nevada

Pacific Seabird Group Bulletin

By:
and

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Abstract

Organochlorine, mercury, and selenium contamination was studied in White-faced Ibis (Plegadis chihi) nesting at Carson Lake, Nevada in 1985 and 1986. DOE was detected in 138 of 140 eggs sampled: Eggshell thickness was negatively correlated with residues of DOE. ODE residues in ibis eggs, unlike residues in most other wading bird eggs from the Great Basin have not declined during the last decade. At ODE levels in eggs above 4ppm (wet weight), clutch size and productivity decreased, and the incidence of cracked eggs increased. Assuming that 4ppm DOE is the critical residue level, 40% of the nesting population in 1985 and 1986 was adversely impacted by DOE, with a net loss of 20% of the population's expected production. Most eggs containing high levels (up to 29ppm) also contained DDT, which implies the source was recently-used DDT. No evidence of breeding ground DOE-DDT contamination was found.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
White-faced ibis DDE-related reproductive problems continue at Carson Lake, Nevada
Series title:
Pacific Seabird Group Bulletin
Volume
16
Issue:
1
Year Published:
1988
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
31 (abstract)
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Pacific Seabird Group Bulletin
First page:
31 (abs)