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Publikováno v:
Canadian Journal of Zoology. 96:1236-1243
During the breeding season, male harbor seals (Phoca vitulina Linnaeus, 1758) produce underwater calls for sexual advertisement. The daily and seasonal timing of these calls is influenced by female availability (i.e., tidal haul-out patterns, foragin
Publikováno v:
Canadian Journal of Zoology. 92:309-318
Optimal diving theory predicts that animals make decisions that maximize their foraging profitability subject to the constraint of oxygen stores. We examined the temporal pattern of prey encounters within a dive from concurrently collected dive data
Publikováno v:
Canadian Journal of Zoology. 88:280-288
We examined the pupping phenology and genetic variation between the currently defined stocks of harbor seals, Phoca vitulina richardsi (Gray, 1864), in Washington’s coastal and inland waters and looked in detail at genetic variation within the inla
Publikováno v:
Canadian Journal of Zoology. 85:290-294
The US National Oceanic and Atmospheric Administration established a buffer zone around marine mammals to prevent harassment. The buffer zone varies by species listing status and by geographic area. However, it is unknown the extent to which vessels
Publikováno v:
Canadian Journal of Zoology. 83:851-859
To determine the effects of diet mixing on digestive performance, harbour seals (Phoca vitulina L., 1758) were offered either pure diets of Pacific herring (Clupea pallasii Valenciennes, 1847) or walleye pollock (Theragra chalcogramma (Pallas, 1814))
Autor:
Kathryn J. Frost, Kelly K. Hastings, M A Simpkins, Robert J. Small, U G Swain, Grey W. Pendleton
Publikováno v:
Canadian Journal of Zoology. 82:1755-1773
Adult and subadult harbor seals (Phoca vitulina richardii (Gray, 1864); n = 108) from Southeast Alaska (SE), Kodiak Island (KO), and Prince William Sound (PWS) were instrumented with satellite data recorders to examine dive parameters for harbor seal
Publikováno v:
Canadian Journal of Zoology. 77:74-87
Time-depth-speed recorders and stomach-temperature sensors were deployed on 11 harbor seals (Phoca vitulina) in the St. Lawrence estuary to examine their diving and foraging behavior. Fifty-four percent of dives were to depths of
Publikováno v:
Canadian Journal of Zoology 75 (1997)
Canadian Journal of Zoology, 75, 2063-2068
Canadian Journal of Zoology, 75, 2063-2068
The diving behaviour of 25 harbour seals, Phoca vitulina (14 females and 11 males), of various body lengths was monitored by means of VHF telemetry at different locations in the Wadden Sea during late autumn in 1991 and 1992. Median dive durations fo
Autor:
John W. Lawson, Garry B. Stenson
Publikováno v:
Canadian Journal of Zoology. 75:2095-2106
The offshore diet of harp seals (Phoca groenlandica) in the northwest Atlantic was determined by reconstructing the contents of prey-containing stomachs (399 of 724) recovered during 1980–1995. The importance of prey species varied seasonally and g
Publikováno v:
Canadian Journal of Zoology. 75:1285-1291
Digestive efficiency (DE) is influenced by many factors including food type or quality. Assimilation efficiency (AE) and DE of 12 captive harp seals (Phoca groenlandica) were estimated for five prey types in large outdoor seawater tanks. In trials of