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Type C botulism in pelicans and other fish-eating birds at the Salton Sea

Studies in Avian Biology

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Abstract

In 1996, type C avian botulism killed over 10,000 pelicans and nearly 10,000 other fish-eating birds at the Salton Sea in southern California. Although botulism had been previously documented in waterbirds at the Sea, this die-off was unusual in that it involved primarily fish-eating birds. The American White Pelican (Pelecanus erythrorynchos) was the species with the greatest mortality in 1996. Since 1996, mortality has recurred every year but losses have declined (<2,000 birds/year), with relatively more Brown Pelicans (P. occidentalis) than White Pelicans afflicted. In 2000, morbidity and mortality of Brown Pelicans with type C botulism (1311) approached the numbers afflicted in 1996 (2034). In recent years, mortality reached a peak earlier in the summer, July and August, in contrast to 1996 when mortality reached a peak in September. An exotic fish species, tilapia (Oreochromis mossambicus), has been implicated as the source of toxin for birds at Salton Sea, but the source of toxin for fish is unknown.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Type C botulism in pelicans and other fish-eating birds at the Salton Sea
Series title:
Studies in Avian Biology
Volume
27
Year Published:
2004
Language:
English
Contributing office(s):
National Wildlife Health Center
Description:
p. 136-140
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Studies in Avian Biology
First page:
136
Last page:
140
Country:
United States
State:
California
Other Geospatial:
Salton Sea
Online Only (Y/N):
N
Additional Online Files(Y/N):
N