Results 171 to 180 of about 12,180 (220)
Some of the next articles are maybe not open access.
Blubber and flipper heat transfer in harp seals
Acta Physiologica Scandinavica, 1997The trunk of marine mammals is encased in a blubber layer which provides thermal insulation that can be changed by circulatory adjustments. The extremities, on the other hand, are poorly insulated but have vascular arrangements constructed for prevention or promotion of heat loss, depending on the thermal state of the animal.
P H, Kvadsheim, L P, Folkow
openaire +2 more sources
Repetitive rates of harp seal underwater vocalizations
Canadian Journal of Zoology, 1987Underwater recordings of harp seal (Phoca groenlandica) vocalizations, obtained within the breeding herd during March, were examined with respect to calling rate and repetition of calls. Vocalizations typically overlapped one another. Calling rates ranged from 32 to 88 calls/min. Repetition rates averaged between 1.9 and 4.7 sound pulses/call (maximum
J. M. Terhune +3 more
openaire +1 more source
Assessment of body condition of harp seals
Polar Biology, 1994We investigated the relationships between blubber content and a suite of condition indices in harp seals (Phoca groenlandica). Although blubber content was significantly correlated with xiphosternal blubber depth and “Condition index” they were insensitive indicators of condition. Blubber depth was most variable at a site ca.
Rosemary Gales, Deane Renouf
openaire +1 more source
Critical factors determining harp seal reproduction
FisheriesSince 2009, the harp seal (HS) trade in Russia has ceased; however, pup production in the White Sea population remains low. Published data on HS nutrition, the energy expenditure on reproduction, and the state of the food supply are reviewed to identify the causes of low pup production. It has been shown that GT females, like all representatives of the
A. I. Boltnev +2 more
openaire +1 more source
Determining lactose content of harp seal milk
Canadian Journal of Zoology, 1983Lactose levels in harp seal (Phoca groenlandica) milk were estimated using three quantitative techniques (phenol–sulphuric acid, anthrone reagent, and picric acid). Based on its low coefficient of variation, accuracy, and simplicity, the anthrone technique was the preferred method.
R. E. A. Stewart +3 more
openaire +1 more source
Neonatal Growth of Northwest Atlantic Harp Seals, Pagophilus groenlandicus
Journal of Mammalogy, 1980Morphometric data were obtained from 219 neonatal harp seals in the Northwest Atlantic in March and April, 1976 to 1979. At birth, pups weighed 10.8 ± 0.65 kg and grew at a rate of 2.5 kg/day during the nursing period, which lasted about 9 days. Much of this weight gain (1.9 kg/day) was associated with deposition of the subcutaneous layer of insulating
R E, Stewart, D M, Lavigne
openaire +2 more sources
Geographical variation of harp seal underwater vocalizations
Canadian Journal of Zoology, 1994Underwater vocalizations of harp seals (Phoca groenlandica) were recorded during the breeding season in the Gulf of St. Lawrence and north of Jan Mayen Island. Each herd had one unique call type and shared (often in different proportions) an additional 17 call types. Of these 17, 13 common call types had sample sizes large enough to permit statistical
openaire +1 more source
Counting Harp Seals with ultra-violet photography
Polar Record, 1976The Harp Seal Pagophilus groenlandicus is a gregarious, migratory seal inhabiting Arctic and sub-Arctic waters of the North Atlantic Ocean. In spring, asthe ice recedes, the largest of three known breeding populations migrates up the east coas of Canada from the Gulf of St Lawrence, along the coast of Labrador, to the Canadian Archipelago, Hudson Bay ...
openaire +1 more source
Journal of the American Veterinary Medical Association, 1974
T M, Wilson, M, Kierstead, J R, Long
openaire +2 more sources
T M, Wilson, M, Kierstead, J R, Long
openaire +2 more sources