scholarly journals Population survey of Peary caribou (Rangifer tarandus pearyi) and muskoxen (Ovibos moschatus) on Banks Island, Northwest Territories, July 2010

Rangifer ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 135 ◽  
Author(s):  
Tracy Davison ◽  
Jodie Pongracz ◽  
Judy Williams
Keyword(s):  
Confidence Interval ◽  
Northwest Territories ◽  
Population Survey ◽  
Rangifer Tarandus ◽  
Population Estimate ◽  
Ovibos Moschatus ◽  
Banks Island

We conducted a systematic aerial transect survey of Peary caribou (Rangifer tarandus pearyi) and muskoxen (Ovibus moschatus) on Banks Island, Northwest Territories, in July 2010. The population estimate of adult Peary caribou was 1097 ± 343 (95% Confidence Interval: CI), which is not significantly different from the 2005 estimate of 929 ± 289 (95% CI; P < 0.05). The current number, however, is a 4- to 9-fold decrease since the 1980s. The adult muskoxen population estimate was 36 676 ± 4031 (95% CI), which is significantly lower than the 2005 estimate of 47 209 ± 3997 (95% CI; P < 0.05).

scholarly journals Peary caribou (Rangifer tarandus pearyi) and muskoxen (Ovibos moschatus) on northwest Victoria Island, Northwest Territories

Rangifer ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 129 ◽  
Author(s):  
Tracy Davison ◽  
Judy Williams
Keyword(s):  
Confidence Interval ◽  
Northwest Territories ◽  
Population Survey ◽  
Rangifer Tarandus ◽  
Population Estimate ◽  
Ovibos Moschatus ◽  
Victoria Island

An aerial population survey of Peary caribou (Rangifer tarandus pearyi) and muskoxen (Ovibus moschatus) on Victoria Island, Northwest Territories, was conducted in July 2010. The population estimate of adult Peary caribou was 150 ± 104 (95% Confidence Interval [CI]) was not significantly different than the 2005 estimate of 66 ± 61 (P < 0.05). There was also an estimate of 430 ± 214 (95% CI) adult Dolphin-Union caribou (R. t. groenlandicus x pearyi) in the study area. However, these caribou represent only a small portion of the Dolphin-Union herd.  The population estimate of 11 442 ± 1637 (95% CI) adult muskoxen is not significantly different than the 2005 estimate of 12 062 ± 2156 (P < 0.05).

scholarly journals Distribution and abundance of muskoxen (Ovibos moschatus) and Peary caribou (Rangifer tarandus pearyi) on Graham, Buckingham, and southern Ellesmere islands, March 2015

Rangifer ◽  
2017 ◽  
Vol 37 (1) ◽  
pp. 97-114 ◽  
Author(s):  
Morgan Anderson ◽  
Michael C.S. Kingsley
Keyword(s):  
Confidence Interval ◽  
Rangifer Tarandus ◽  
Ellesmere Island ◽  
Population Estimate ◽  
Low Density ◽  
Coastal Plains ◽  
Ovibos Moschatus ◽  
Ice Cap ◽  
Low Levels ◽  
River Valleys

We flew a survey of southern Ellesmere Island, Graham Island, and Buckingham Island in March 2015 to obtain estimates of abundance for muskoxen and Peary caribou. Generally, muskoxen were abundant north of the Sydkap Ice Cap along Baumann Fiord, north of Goose Fiord, west and north of Muskox Fiord, and on the coastal plains and river valleys east of Vendom Fiord. Although few, they were also present on Bjorne Peninsula and the south coast between the Sydkap Ice Cap and Jakeman Glacier. We observed a total of 1146 muskoxen. Calves (approximately 10-months old) made up 22% of the observed animals. The population estimate was 3200 ± 602 SE (standard error) muskoxen, the highest muskox population size ever estimated for southern Ellesmere, Graham and Buckingham islands. This could be because previous efforts typically surveyed only a portion of our area or focused elsewhere, or the results were provided only as minimum counts rather than estimates of abundance. Regardless, our results indicate that the muskox population has recovered from low levels in 2005 of 312-670 (95% confidence interval [CI]) individuals. Peary caribou abundance appears to be low.  We only saw 38 Peary caribou during our 2015 survey. This confounds appraisal of possible abundance change since 2005, when 109-442 caribou (95% CI) were estimated to inhabit the same surveyed area. We estimated 183 ± 128 SE Peary caribou, and suggest that their numbers are likely stable at low density on southern Ellesmere Island.

Observations on demography, reproduction, and morphology of muskoxen (Ovibos moschatus) on Banks Island, Northwest Territories

1987 ◽  
Vol 65 (2) ◽  
pp. 265-269 ◽  
Author(s):  
P. B. Latour
Keyword(s):  
Body Weight ◽  
Northwest Territories ◽  
Total Sample ◽  
Age Classes ◽  
Ovibos Moschatus ◽  
Banks Island ◽  
Males And Females

Muskoxen were harvested from three locations on Banks Island in 1981, 1982, and 1983 in the following numbers: 1981, 224; 1982, 87; 1983, 82. Only the 1981 harvest was nonselective for specific age-classes. There was a maximum of 0.83 calves per female ≥ 3 years old in mid-May, as determined by calf and fetus counts; these calves represented 24% of the total sample. Over 90% of all calving was completed by 8 May. Calving may start as early as 8 April and likely no later than 19 April. Body weight increased until at least 5 years of age for both males and females; males were significantly heavier than females at 2 years of age and older. Length and girth increased for both sexes until 5 years of age with significant differences between the sexes occurring at approximately 4 years for girth and 5 years for length.

Counting muskoxen in the Northwest Territories

1989 ◽  
Vol 67 (5) ◽  
pp. 1112-1115
Author(s):  
Ron Graf ◽  
Ray Case
Keyword(s):  
Northwest Territories ◽  
Physical Model ◽  
Coefficient Of Variation ◽  
High Density ◽  
Ovibos Moschatus ◽  
Banks Island ◽  
River Valleys

Muskoxen (Ovibos moschatus) are difficult to sample because they generally live in groups and the groups are distributed in a strongly contagious manner. We examined various techniques by first creating a physical model of the known distribution of muskoxen of northern Banks Island, Northwest Territories. Then, we sampled the population of the model using different techniques at various levels of coverage, and used the coefficient of variation as the indicator of precision. Our recommendation was to use a stratified, random transect survey with the transects oriented across river valleys in high-density areas. If possible, only stratified surveys are now used in the field and they continue to produce good, precise results.

scholarly journals Observations of Musk Oxen on Banks Island, Northwest Territories, Canada

ARCTIC ◽  
1963 ◽  
Vol 16 (4) ◽  
pp. 275
Author(s):  
William J. Maher ◽  
Richard T. Holmes
Keyword(s):  
Northwest Territories ◽  
Ovibos Moschatus ◽  
Banks Island

Notes summer 1963 observations of <em>Ovibos moschatus</em>. On a reconnaissance flight over the northern third of the island on Aug. 2 nearly sixty were seen, indicating greater abundance than hitherto supposed. Only two were seen south of the reconnaissance area during a two-month period; apparently they concentrate in the northern part at least during the summer.

scholarly journals Peary caribou, muskoxen and Banks Island forage: Assessing seasonal diet similarities

Rangifer ◽  
1997 ◽  
Vol 17 (1) ◽  
pp. 9 ◽  
Author(s):  
Nicholas C. Larter ◽  
John A. Nagy
Keyword(s):  
Standing Crop ◽  
Rangifer Tarandus ◽  
Weather Conditions ◽  
Low Density ◽  
Winter Weather ◽  
Ovibos Moschatus ◽  
Considerable Similarity ◽  
Carex Aquatilis ◽  
Banks Island ◽  
Salix Arctica

Peary caribou (Rangifer tarandus pearyi) and muskoxen {Ovibos moschatus) on Banks Island had considerable similarity in their annual diets, with monthly similarities ranging from 17.8-73.3%. Diet similarity was more pronounced in areas of high muskox density {ca. 1.65/km2) than in areas of low muskox density {ca. 0.4/km2). Willow (Salix arctica) and sedge (Carex aquatilis and Eriophorum spp.) represented &gt;80% of the monthly diet of muskoxen. The caribou diet was more diverse, and was dominated by sedge, willow, Dryas integrifolia, and Oxytropis maydelliana, Lichen use was rare, likely as a consequence of low availability on Banks Island. Lichen standing crop was estimated at 2.96 g/m2. The differences in muskox diet between high and low density areas could not be explained by differences in forage distribution or standing crop. We discuss diet similarities of caribou and muskoxen and potential consequences for the current Peary caribou population in relation to winter weather conditions and increasing muskox density.

РАДИОУГЛЕРОДНЫЕ ДАТИРОВКИ ПАЛЕОНТОЛОГИЧЕСКИХ ОБРАЗЦОВ ВЕРХНЕГО ПЛЕЙСТОЦЕНА НИЖНЕЙ ОБИ

2020 ◽  
Author(s):  
I. Zolnikov ◽  
◽  
A. Vybornov ◽  
A. Anoikin ◽  
A. Postnov ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Rangifer Tarandus ◽  
Western Siberia ◽  
Budker Institute ◽  
Mammuthus Primigenius ◽  
Upper Pleistocene ◽  
Ovibos Moschatus ◽  
The North

In the course of studies conducted by IAET SB RAS in the Lower Ob in 2016–2019, the understanding of the conditions for settlement of the Paleolithic population in the north of Western Siberia was significantly supplemented. Dating of a series of paleontological finds was carried out at the "Accelerated mass spectrometer of the Budker Institute of Nucle- ar Physics of SB RAS". The dates obtained show the distribution of the main representatives of the Upper Pleistocene fauna of Subarctica: Mammuthus primigenius – 50,000–15,000 BP, Coelodonta antiquitatis – 43,000–38,000 BP and 27,000–25,000 BP, Rangifer tarandus, Equus ferus – 40,000–10,000 BP, Bison sp. – 50,000–40,000 BP, Ovibos moschatus – 41,000–32,000 BP.

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

1991 ◽  
Vol 27 (4) ◽  
pp. 527-533 ◽  
Author(s):  
John E. Blake ◽  
Bruce D. McLean ◽  
Anne Gunn
Keyword(s):  
Northwest Territories ◽  
Banks Island ◽  
Free Ranging

Is there a cost of parasites to caribou?

Parasitology ◽  
2008 ◽  
Vol 136 (2) ◽  
pp. 253-265 ◽  
Author(s):  
J. HUGHES ◽  
S. D. ALBON ◽  
R. J. IRVINE ◽  
S. WOODIN
Keyword(s):  
Rangifer Tarandus ◽  
Parasite Species ◽  
Negative Relationship ◽  
Apparent Competition ◽  
Range Shift ◽  
The Arctic ◽  
Contributory Factor ◽  
Ovibos Moschatus ◽  
Winter Range ◽  
Nematode Parasites

SUMMARYMacroparasites potentially play a significant but often ignored role in the ecology and dynamics of wild ruminant populations. In the Arctic, parasites may impact on host populations by exacerbating the effects of seasonal and limited forage availability on the condition, fecundity and survival of individuals. We studied the effects of abomasal nematode parasites and warble flies, Hypoderma tarandi, on condition and pregnancy of caribou Rangifer tarandus in the Dolphin-Union herd, Nunavut, Canada. By the end of winter, female caribou over 2 years old showed a significant decrease in body weight with increasing nematode burden, and a decrease in back fat depth with increasing warble abundance. These effects were exaggerated in the non-pregnant fraction of the population. High warble larvae burdens were also associated with significantly reduced probability of being pregnant. Our research demonstrates a negative relationship between parasites and caribou condition that may have consequences for their fitness. Additionally, we discuss the possibility that muskox Ovibos moschatus share some parasite species with the caribou and could lead to elevated burdens in the sympatric host. Parasites may have been a contributory factor in a previous winter range-shift of the caribou herd and this may reflect a form of apparent competition between the two ungulate species.

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