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Mortality in Laysan ducks (Anas alysanensis) by emaciation complicated by Echinuria uncinata on Laysan Island, Hawaii

Journal of Wildlife Diseases

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Abstract

In November 1993, unusual mortality occurred among endangered Laysan ducks on Laysan Island, one of the remote refugia of the Northwestern Hawaiian Islands National Wildlife Refuge (USA). Ten live ducks were emaciated, and blood samples documented anemia, heterophilia, and eosinophilia. Pathology in 13 duck carcasses revealed emaciation, marked thickening of the proventricular wall, abundant mucus, and nodules in the gastrointestinal tract. Histology revealed granulomata associated with nematodes in the proventriculus, small intestines, and body walls of nine of 10 ducks examined on histology. We suspect that low rainfall and low food abundance that year contributed to enhanced pathogenicity of parasite infection, either through increased exposure or decreased host resistance. Because the Laysan duck is found only on Laysan island and is critically endangered, translocation of this species to other islands is being considered. Given that we have not seen pathology associated with Echinuria spp. in native waterfowl on other Hawaiian Islands and given the parasitea??s potential to cause significant lesions in Laysan ducks, it will be important to prevent the translocation of Echinuria spp.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mortality in Laysan ducks (Anas alysanensis) by emaciation complicated by Echinuria uncinata on Laysan Island, Hawaii
Series title:
Journal of Wildlife Diseases
Volume
40
Issue:
1
Year Published:
2004
Language:
English
Contributing office(s):
National Wildlife Health Center
Description:
p. 110-114
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Diseases
First page:
110
Last page:
114
Number of Pages:
5