Comparative Parasitology 67(2) 2000 - Peru State College

LYONS ET AL.—HOOKWORMS IN NORTHERN FUR SEAL PUPS 221
Table 4. Prevalence of Vncinaria lucasi in intestines of northern fur seal pups at necropsy in some studies
in Russia and in California, U.S.A.
Location Reference
Russia
Commander Islands
Bering Island
Northern rookery
Northwestern rookery
Medny Island
Southeastern rookery
Urilie rookery
Bering Island
Unknown rookery
California, U.S.A.
Channel Islands
San Miguel Island
West Cove rookery
Adams Cove rookery
Year of
study
Kolevatova et al. (1978) 1997
Mizuno (1997)
Lyons et al. (1997)
trum samples were collected for 4 consecutive
lactations from 6 individual sows (Stewart et al.,
1976). There was an exponential decline of parasitic
L3 of S. ransomi with each lactation. The
mean number of larvae/ml of colostrum was 1.1
for the first lactation and 0.06 for the fourth lactation.
Several aspects of the life cycle of U. lucasi,
as studied in northern fur seals on St. Paul Island
(Lyons, 1994), may have a role in the decline in
prevalence: 1) the only source of adult hookworms
in pups is from parasitic L3 passed in the
mother's milk for