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.

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 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, 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.

Precision performance at low levels and 99th percentile concentration of the Access® AccuTnI® assay on two different platforms

2009 ◽  
Vol 47 (3) ◽  
Author(s):  
Martina Zaninotto ◽  
Monica Maria Mion ◽  
Enrica Novello ◽  
Marco Moretti ◽  
Ernesto Delprete ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Myocardial Necrosis ◽  
Low Levels ◽  
Cardiac Troponins

Abstract: Cardiac troponins currently represent the preferred biomarkers for the detection of myocardial necrosis. The objective of the present study was to compare the performance of the Access: The Access: cTnI concentrations are given in μg/L. 10% CV values (95% confidence interval, CI) were 0.0577 (0.0467–0.0750) (UniCel: Our data confirm the reliability of the evaluated cTnI assay and demonstrate the comparability of the cTnI values between the platforms studied.Clin Chem Lab Med 2009;47:367–71.

The historical residue trend of PCBs in the Agassiz Ice Cap, Ellesmere Island, Canada

1995 ◽  
Vol 160-161 ◽  
pp. 117-126 ◽  
Author(s):  
D.J. Gregor ◽  
A.J. Peters ◽  
C. Teixeira ◽  
N. Jones ◽  
C. Spencer
Keyword(s):  
Ellesmere Island ◽  
Ice Cap

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.

scholarly journals Clinical relevance of glomerular IgM deposition in patients with lupus nephritis

2021 ◽  
Author(s):  
Fengmei Wang ◽  
Jirong Yu ◽  
Lei zhang ◽  
Yan Zhang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Lupus Nephritis ◽  
Serum Creatinine ◽  
Plasma Levels ◽  
Clinical Relevance ◽  
Alternative Pathway ◽  
Clinicopathological Parameters ◽  
Low Density ◽  
Lower Plasma ◽  
Low Levels

Abstract Background The aim of the study was to investigate the clinical relevance of IgM deposition in patients with LN in a large cohort. Results 217 patients with renal biopsy–proven lupus nephritis were enrolled. The associations between glomerular IgM deposition and clinicopathological parameters were further analyzed. IgM deposition was positively correlated with glomerular C1q and C3 deposition moderately (r = 0.436, P < 0.001; r = 0.408, P < 0.001, respectively), and inversely correlated with plasma levels of C3 and CFH mildly (r=-0.138, P = 0.043; r=-0.147, P = 0.037, respectively). By multivariate analysis, we found that glomerular IgM deposition independently contributes to glomerular C3 deposition in patients with lupus nephritis (OR = 2.002, 95% CI: 1.295–3.094, P = 0.002). In addition, we also found that patients with IgM 0+-2 + had similar plasma CFH levels, but in patients with IgM3+-4+, plasma CFH levels were significantly lower (300.4 ± 155.8µg/ml vs. 429.9 ± 187.5µg/ml, P < 0.001). Furthermore, patients with high density of glomerular IgM and low levels of CFH had heavier proteinuria, higher serum creatinine and lower plasma C3 levels (5.7 ± 3.1g/d vs. 4.7 ± 3.5g/d, P = 0.037;150.1 ± 121.0µmol/L vs. 105.6 ± 97.1µmol/L, P = 0.005; 0.3 ± 0.2µg/L vs. 0.4 ± 0.2µg/L, P = 0.04, respectively), comparing with those with low density of glomerular IgM and low levels of CFH. Conclusions Our results suggested IgM might bind to injury-associated epitopes and be involved in disease progression and provided a possible relevance of CFH and IgM in the process of alternative pathway (AP) activation.

scholarly journals Forests of Japanese alder in the Russian Far East: the new association of the class Alnetea japonicae Miyawaki et al. 1977

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Kirill A. Korznikov ◽  
◽  
Valentina P. Verkholat ◽  
Pavel V. Krestov ◽  
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Coastal Plains ◽  
Alnus Japonica ◽  
Lateral Inflow ◽  
New Association ◽  
River Valleys ◽  
Hokkaido Island ◽  
Northern Japan ◽  
The Russian Far East

We describe the new association Lycopo lucidi–Alnetum japonicae Korznikov, Verkholat & Krestov 2021 ass. nov. of the Alnus japonica swampy forests of the coastal plains and river valleys in the south of the Primorye Territory of Russia. The association includes two subassociations: Lycopo lucidi–Alnetum japonicae typicum Korznikov, Verkholat & Krestov 2021 subass. nov. and the preliminary delineated Lycopo lucidi–Alnetum japonicae betuletosum davuricae subass. prov. developing on gently sloping foothills with a lateral inflow of moisture and is transitional to zonal broad-leaved forests of the class Quercetea mongolicae Song ex Krestov et al. 2006. The association is classified to the alliance Fraxino–Alnion japonicae Miyawaki et al. 1977 described from Japan and belonging to the order Alnetalia japonicae Miyawaki et al. 1977 and the class Alnetea japonicae Miyawaki et al. 1977. We also validate the name of the association Stellario longifoliae–Alnetum japonicae Ohno in Miyawaki 1988 nom. inval. (art. 5) from Hokkaido Island, Northern Japan.

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