Comparison of Heavy Metals in Two Groups of Ringed Seals (Phoca hispida) from the Canadian Arctic

1989 ◽  
Vol 46 (9) ◽  
pp. 1558-1563 ◽  
Author(s):  
R. Wagemann
Keyword(s):  
Heavy Metals ◽  
Reference Group ◽  
Canadian Arctic ◽  
Phoca Hispida ◽  
Mine Area ◽  
Ringed Seals ◽  
Lead Zinc ◽  
Zinc Mine ◽  
The Mean ◽  
Positive Correlations

Heavy metals (Pb, Hg, Cd, Cu, and Zn) and Se and As were determined in liver, kidney, and muscle of ringed seals captured near a lead–zinc mine in the Strathcona Sound area, and in a reference group from Admiralty Inlet in the Canadian Arctic. The mean concentrations of Pb in liver and muscle and Se in muscle were higher in seals shot near the mine area than in a reference group shot 50–75 km from this area, notwithstanding large variances in metal concentrations arising from inter-metal and Hg–age and Cd–age positive correlations. Strong positive correlations were found between age of animals in the reference group and Cd in kidney and Hg in liver between Se and Hg in liver, and a negative one between age and Cu in the three tissues examined. Nearly halt of the individuals in the mine-area group were shown, by multiple linear regression, to have higher Hg, Pb, or Cd than the reference group. High Cd concentrations were found in tissues of seals from both groups.

Distribution and abundance of ringed (Phoca hispida) and bearded seals (Erignathus barbatus) in western Hudson Bay

1997 ◽  
Vol 54 (4) ◽  
pp. 914-921 ◽  
Author(s):  
N J Lunn ◽  
I Stirling ◽  
S N Nowicki
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
Phoca Hispida ◽  
Current Estimate ◽  
Ringed Seals ◽  
Erignathus Barbatus ◽  
The Mean ◽  
Western Hudson Bay ◽  
The Relationship ◽  
Bearded Seals

We flew a medium-altitude, systematic, strip-transect survey for ringed (Phoca hispida) and bearded seals (Erignathus barbatus) over western Hudson Bay in early June 1994 and 1995. The mean density (per square kilometre) of ringed seals hauled out on the ice was four times higher in 1995 (1.690) than in 1994 (0.380). The 1994 survey appeared to underestimate seal abundance because it was flown too late. Ringed seals preferred high ice cover habitat (6 + /8 ice) and, within this habitat, favoured cracking ice and large floes. We found no consistent effect of either wind or cloud cover on habitat preference. We estimated a total of 1980 bearded seals and 140<|>880 ringed seals hauled out on the sea ice in June 1995. A recent review of the relationship between ringed seal and polar bear (Ursus maritimus) populations suggests that a visible population of this size should support a population of up to 1300 polar bears, which is in general agreement with the current estimate of 1250-1300 bears in western Hudson Bay.

Population parameters of ringed seals (Phoca hispida Schreber, 1775) in the Svalbard area

1987 ◽  
Vol 65 (4) ◽  
pp. 1021-1027 ◽  
Author(s):  
Christian Lydersen ◽  
Ian Gjertz
Keyword(s):  
Sex Ratio ◽  
Ringed Seal ◽  
Adult Males ◽  
Population Parameters ◽  
Phoca Hispida ◽  
Age Class ◽  
Ringed Seals ◽  
Males And Females ◽  
The Mean ◽  
Sexually Mature

Samples were taken from 284 ringed seals (Phoca hispida) in the Svalbard area during April–July 1981 and March–April 1982. The age of 283 seals was determined by reading annuli in the cementum of the canine teeth. The mean age of the males was 11.3 years, and of the females, 14.9 years. Females were found to be significantly older than males. The mean length of sexually mature ringed seals was 128.9 cm for both sexes. The mean weight of adult males and females was 53.5 and 61.4 kg, respectively. Females were found to be significantly heavier than males. The sex ratio was 47.8% males and 52.2% females. Studies of microscopic sections of testis and epididymis from ringed seal males showed that 63, 75, and 80% of 5-, 6-, and 7-year-old animals, respectively, were sexually mature. The weights of testis and epididymis, diameters of tubuli, and the size of testis all showed a marked increase in the 5-year age-class. Macroscopic sections of ovaries from ringed seal females showed that 20, 60, and 80% of 3-, 4-, and 5-year-old animals, respectively, were sexually mature. The size of the ovaries showed a marked increase in the 5-year age-class. The ovulation rate of ringed seals from Svalbard was calculated to be 0.91.

Trends of persistent organic pollutants in ringed seals (Phoca hispida) from the Canadian Arctic

2019 ◽  
Vol 665 ◽  
pp. 1135-1146 ◽  
Author(s):  
M. Houde ◽  
X. Wang ◽  
T.-L.L. Colson ◽  
P. Gagnon ◽  
S.H. Ferguson ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Canadian Arctic ◽  
Phoca Hispida ◽  
Ringed Seals

The Lichen Flora Near a Lead-Zinc Mine at Maarmorilik in West Greenland

1991 ◽  
Vol 23 (4) ◽  
pp. 381-391 ◽  
Author(s):  
E. S. Hansen
Keyword(s):  
Heavy Metals ◽  
Alkaline Soil ◽  
West Greenland ◽  
Mining Town ◽  
Ecological Preferences ◽  
Lead And Zinc ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Airborne Lead ◽  
Lichen Flora

AbstractEighty-seven lichen taxa were collected at four localities near the leadzinc mine at Maarmorilik. These are listed alphabetically and grouped according to their ecological preferences. Lichens, which in Greenland are restricted to calcareous rocks and alkaline soil substrata, are well represented in the Maarmorilik area. In contrast, ferrugineous lichens appear to be comparatively rare. The lichens around the mining town are assumed to have accumulated significant concentrations of airborne lead and zinc. However, no damage to the lichens caused by heavy metals was observed.

scholarly journals Delta-aminolevulinic acid dehydratase (ALAD) and vitamin D receptor (VDR) genes polymorphisms in children residing in an abandoned lead‑zinc mine area in Kabwe, Zambia

Meta Gene ◽  
2021 ◽  
Vol 27 ◽  
pp. 100838
Author(s):  
Yared B. Yohannes ◽  
Shouta M.M. Nakayama ◽  
John Yabe ◽  
Haruya Toyomaki ◽  
Andrew Kataba ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Receptor ◽  
Aminolevulinic Acid ◽  
Mine Area ◽  
Acid Dehydratase ◽  
Lead Zinc ◽  
Zinc Mine
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