YERSINIOSIS IN FREE-RANGING MUSKOXEN ON BANKS ISLAND, NORTHWEST TERRITORIES, CANADA

Intestinal contents from two muskoxen, Ovibos moschatus (Zimmermann), collected in March 1978 on Devon Island, N.W.T., both contained Marshallagia marshalli (Ransom 1906) and Nematodirus helvetianus May 1920. Intestinal contents from five muskoxen collected in August 1978 on Ellesmere Island, N.W. T., contained Moniezia expansa (Rudolphi 1810) (one of the five), Ostertagia trifurcata Ransom 1907 (one of five), M. marshalli (one of five) and N. helvetianus (two of five). Cysticerci of Taenia hydatigena Pallas 1766 were found in two of the five animals from Ellesmere Island.

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First Records of Sockeye (Oncorhynchus nerka) and Pink Salmon (O. gorbuscha) from Banks Island and Other Records of Pacific Salmon in Northwest Territories, Canada

ARCTIC ◽

10.14430/arctic846 ◽

2000 ◽

Vol 53 (2) ◽

Cited By ~ 24

Author(s):

John A. Babaluk ◽

James D. Reist ◽

James D. Johnson ◽

Lionel Johnson

Keyword(s):

Northwest Territories ◽

Pacific Salmon ◽

Oncorhynchus Nerka ◽

Pink Salmon ◽

Banks Island

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Studies in Banks Island and Victoria Island, Northwest Territories, 1949

Polar Record ◽

10.1017/s0032247400048221 ◽

1953 ◽

Vol 6 (46) ◽

pp. 789-790

Keyword(s):

Northwest Territories ◽

Banks Island ◽

Victoria Island

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Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories

Canadian Journal of Earth Sciences ◽

10.1139/e87-105 ◽

1987 ◽

Vol 24 (6) ◽

pp. 1077-1085 ◽

Cited By ~ 46

Author(s):

Antoni G. Lewkowicz

Keyword(s):

Northwest Territories ◽

Latent Heat ◽

Field Measurements ◽

Geometric Factor ◽

Ground Ice ◽

Model Based ◽

Banks Island ◽

Sand Hills ◽

Ground Slope ◽

The Relationship

The relationship between ice-face ablation and headwall retreat is described for three ground-ice slumps in the Sand Hills moraine, southwest Banks Island. Retreat exceeds ablation by a geometric factor that depends on the slope of the ice and the gradient of the surrounding terrain. Amounts of retreat predicted from ice-ablation calculations compare favourably with field measurements, except at the start of thermokarst activity in the spring or when the ground ice remains covered by debris for long periods.Long-term headwall retreat for slumps in southern Banks Island with different orientations and ice contents can be estimated using a model based on meteorological information. The model predicts headwall recession of 11 m/a for a ground-ice slump facing south and 8.8–9.3 m/a for one facing north, with inputs of a 35 °ice face, a ground slope of 5°, and a volumetric latent heat of 270 MJ/m3. These predictions are close to the maximum rates of retreat over a 10 year period as measured from air photographs.

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