Results 151 to 160 of about 130,433 (199)

Seasonal variation in energy intake and condition of harp seals: Is there a harp seal morph? Problems for bioenergetic modelling

Journal of Zoology, 1993
Seasonal changes in mass, fat depth, condition index and energy intake were measured in eight captive harp seals (Phoca groenlandica) over a 15‐month period. Two of the five adult females were pregnant but lost their pups before term. There were large shifts in all variables measured.
D. Renouf, Rosemary Gales, Elizabeth Noseworthy   +2 more
openaire   +1 more source

Mineral constituents of harp seal milk

Canadian Journal of Zoology, 1984
Milk samples were collected from stomachs of 20 harp seal pups (Phoca groenlandica) in the Gulf of St. Lawrence. Milk was analysed for ash content, 14 minerals, and for changes in mineral composition associated with maternal age and stage of lactation.
B. E. Webb, R. E. A. Stewart, D. M. Lavigne   +2 more
openaire   +1 more source

Pagophilus groenlandicus (Harp seal)

1973
The karyotypes are gifts of Dr. U. Amason, Lund, Sweden, and are prepared from solid tissue culture by the orcein squash method. The male comes from the St. Lawrence estuary, New found land, Canada, the female, from Kulusuk, Greenland. The X chromosomes of the female were identified by radioautography.
T. C. Hsu, Kurt Benirschke
openaire   +1 more source

Radiative surface temperatures of harp seals

Comparative Biochemistry and Physiology Part A: Physiology, 1978
Abstract 1. 1. Ambient air temperature rather than wind speed or heat flow exerted the greatest effect on radiative heat loss from harp seal pup fur. 2. 2. Fur conductance was higher when calculated using radiative temperature rather than air temperature as representative of ambient temperatures. 3. ]3.
N.A Øritsland, D.M Lavigne, K Ronald
openaire   +1 more source

Assessment of body condition of harp seals

Polar Biology, 1994
We 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

Phagocytosis in pup and adult harbour, grey and harp seals

Veterinary Immunology and Immunopathology, 2010
Knowledge on pinniped immunology is still in its infancy. For instance, age-related and developmental aspects of the immune system in pinnipeds need to be better described. The present study examined the phagocytic activity and efficiency of harbour, grey and harp seal leukocytes.
Mike O. Hammill, Michel Lebeuf
exaly   +3 more sources

Exploitation and conservation of Harp and Hood Seals

Polar Record, 1965
Great improvements have taken place in the last few years in the dressing of hair seal pelts for furs and the market for these furs has diversified and expanded. Consequently, the catching of hair seals of all species has intensified and the stocks of Harp Seals (Pagophilus groenlandicus)and Hood Seals (Cystophora cristata) of the North Atlantic ...
openaire   +1 more source

Structure of the adenohypophysis in juvenile harp seal, Pagophilus groenlandicus

Cell and Tissue Research, 1976
A study was made of the morphology of the adenohypophysis in immature harp seals and the fine structure of cellular components of the pars tuberalis, pars intermedia and pars distalis was described. The pars intermedia composed 8-15% of the hypophysis and contained colloid filled vesicles similar to those found in the other mammalian species.
J F, Leatherland, K, Roland
openaire   +2 more sources

Organochlorine and mercury residues in the harp seal (Pagophilus groenlandicus)

Science of The Total Environment, 1976
Samples of blubber, liver, kidney and brain, obtained from 10 male, 6 female neonatal, and 4 lactating female harp seals (Pagophilus groenlandicus), were analysed for DDT, dieldrin, PCB, and total mercury. Methyl mercury levels in blood were also determined. Biocide deposition was not significantly different in female and male ten day old pups.
D, Jones, K, Ronald, D M, Lavigne, R, Frank, M, Holdrinet, J F, Uthe   +5 more
openaire   +2 more sources

Bile acids from the harp seals, Phoca groenlandica

Comparative Biochemistry and Physiology Part A: Physiology, 1988
1. The bile acids composition of the harp seal, Phoca groenlandica, collected around Newfoundland, Canada, had been examined. 2. 13C n.m.r. spectroscopy of the crude bile extract was superior to t.l.c. analysis in revealing the presence of phocaecholic acid and a taurine moiety in this mixture. 3.
J, Hellou, A, King, I H, Ni
openaire   +2 more sources