Skip to main content
U.S. flag

An official website of the United States government

Intestinal helminths of river otters (Lutra canadensis) from the Pacific Northwest

January 1, 1997

The intestinal helminth fauna of river otters, Lutra canadensis, from the Pacific Northwest was characterized by low species richness and intensity of infection. River otters from the lower Columbia River (n = 23) were infected with 9 species of helminths (83% prevalence); those from a relatively undisturbed reference area near the headwaters of the Trask and Wilson rivers on the Oregon coast (n = 6) were infected by 5 species of helminths (100% prevalence). Single species of Eucestoda (Schistocephalus solidus), Digenea (Euparyphium inerme), Acanthocephala (Corynosoma strumosum), and 8 species of Nematoda (Strongyloides lutrae; larvae of Eustrongylides sp., Anisakis sp., and Contracaecum sp.; 3 of Cystidicolidae, and Hedruris sp.) were collected. Most species are typical of piscine definitive hosts and were present as incidental parasites of river otters. Notably, specimens of Euparyphium inerme are reported for the first time in river otters from North America; occurrence of other helminths constitutes new host or geographic records for parasites in river otters in Oregon and Washington. Parasites with marine life cycles were acquired by river otters in freshwater habitats at a great distance from the ocean. The helminth fauna of river otters in the Pacific Northwest was influenced primarily by ecological factors and was indicative of eclectic food habits and the relatively extensive home ranges occupied by these mustelids.

Citation Information

Publication Year 1997
Title Intestinal helminths of river otters (<i>Lutra canadensis</i>) from the Pacific Northwest
DOI 10.2307/3284324
Authors Eric P. Hoberg, Charles J. Henny, O.R. Hedstrom, Robert A. Grove
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Parasitology
Series Number
Index ID 1015840
Record Source USGS Publications Warehouse
USGS Organization Forest and Rangeland Ecosystem Science Center