Aspects of Evolution and Adaptation in American Black Bears (Ursus americanus Pallas) and Brown and Grizzly Bears (U. arctos Linné.) of North America

1972 ◽  
Vol 2 ◽  
pp. 221 ◽  
Author(s):  
Stephen Herrero
Keyword(s):  
North America ◽  
Ursus Americanus ◽  
Black Bears ◽  
Grizzly Bears ◽  
American Black ◽  
American Black Bears

Helminths of grizzly bears (Ursus arctos) and American black bears (Ursus americanus) in Alberta and British Columbia, Canada

2015 ◽  
Vol 93 (10) ◽  
pp. 765-772 ◽  
Author(s):  
S. Catalano ◽  
M. Lejeune ◽  
P. Tizzani ◽  
G.G. Verocai ◽  
H. Schwantje ◽  
...  
Keyword(s):  
British Columbia ◽  
Ursus Arctos ◽  
Ursus Americanus ◽  
Statistical Significance ◽  
Black Bears ◽  
Grizzly Bears ◽  
Infection Prevalence ◽  
Infection Parameters ◽  
American Black ◽  
American Black Bears

Between May 2011 and June 2013, we collected the carcasses and gastrointestinal tracts of 40 American black bears (Ursus americanus Pallas, 1780) and 13 grizzly bears (Ursus arctos L., 1758) from populations of Alberta and British Columbia, Canada. Specimens were examined for helminths, which were identified to the species level by applying an integrated morphological and molecular approach. Our goal was to investigate parasite biodiversity and infection parameters in the sampled grizzly and black bears. We found seven parasite taxa: Dirofilaria ursi Yamaguti, 1941, Baylisascaris transfuga (Rudolphi, 1819), Uncinaria rauschi Olsen, 1968, Uncinaria yukonensis (Wolfgang, 1956), Taenia arctos Haukisalmi, Lavikainen, Laaksonen and Meri, 2011, Diphyllobothrium dendriticum (Nitzsch, 1824), and Diphyllobothrium nihonkaiense Yamane, Kamo, Bylund and Wikgren, 1986. The statistical significance of infection prevalence, intensity, and abundance for each helminth species was assessed relative to host species, gender, age class, sampling season, and location. This is the first unequivocal report of the potentially zoonotic tapeworms D. dendriticum and D. nihonkaiense in North American bears. Furthermore, we provide insight into the biology and ecology of the nematodes B. transfuga, D. ursi, and species of Uncinaria Frölich, 1789, and enrich the information available on the recently described tapeworm T. arctos.

Sperm ultrastructure, morphometry, and abnormal morphology in American black bears (Ursus americanus)

2010 ◽  
Vol 74 (8) ◽  
pp. 1403-1413 ◽  
Author(s):  
L.F.C. Brito ◽  
P.L. Sertich ◽  
G.B. Stull ◽  
W. Rives ◽  
M. Knobbe
Keyword(s):  
Ursus Americanus ◽  
Black Bears ◽  
Sperm Ultrastructure ◽  
Abnormal Morphology ◽  
American Black ◽  
American Black Bears

LEPTOSPIROSIS IN URBAN AND SUBURBAN AMERICAN BLACK BEARS (URSUS AMERICANUS) IN WESTERN NORTH CAROLINA, USA

2019 ◽  
Vol 55 (1) ◽  
pp. 74 ◽  
Author(s):  
Indrani Sasmal ◽  
Nicholas P. Gould ◽  
Krysten L. Schuler ◽  
Yung-Fu Chang ◽  
Anil Thachil ◽  
...  
Keyword(s):  
North Carolina ◽  
Ursus Americanus ◽  
Black Bears ◽  
Western North Carolina ◽  
American Black ◽  
American Black Bears

COMPARISON OF ISOFLURANE GAS VERSUS A GUAIFENESIN, KETAMINE, AND MEDETOMIDINE CONSTANT-RATE INFUSION FOR MAINTENANCE ANESTHESIA IN AMERICAN BLACK BEARS (URSUS AMERICANUS)

2019 ◽  
Vol 50 (3) ◽  
pp. 570
Author(s):  
Jessica L. Siegal-Willott ◽  
Kendra L. Bauer ◽  
Lee-Ann C. Hayek ◽  
Nicole M. Luensman ◽  
Tangara N. Cross ◽  
...  
Keyword(s):  
Ursus Americanus ◽  
Black Bears ◽  
Constant Rate Infusion ◽  
Constant Rate ◽  
American Black ◽  
American Black Bears ◽  
Rate Infusion

PHARMACOKINETICS OF A SINGLE DOSE OF FLURALANER ADMINISTERED ORALLY TO AMERICAN BLACK BEARS (URSUS AMERICANUS)

2020 ◽  
Vol 51 (3) ◽  
Author(s):  
Peach Van Wick ◽  
Mark G. Papich ◽  
Brie Hashem ◽  
Ernesto Dominguez-Villegas
Keyword(s):  
Single Dose ◽  
Ursus Americanus ◽  
Black Bears ◽  
American Black ◽  
American Black Bears

scholarly journals Whitebark Pine (Pinus albicaulis) seeds as food for bears (Ursus spp.) in Banff National Park, Alberta

2015 ◽  
Vol 129 (1) ◽  
pp. 8 ◽  
Author(s):  
David Hamer ◽  
Ian Pengelly
Keyword(s):  
National Park ◽  
Basal Area ◽  
Black Bears ◽  
Habitat Characteristics ◽  
Grizzly Bears ◽  
Pinus Albicaulis ◽  
Whitebark Pine ◽  
Banff National Park ◽  
American Black ◽  
American Black Bears

The large, nutrient-rich seeds of Whitebark Pine (Pinus albicaulis Engelmann) are important food for bears (Ursus spp.) in Yellowstone National Park. In Banff National Park, studies have shown that American Black Bears (Ursus americanus) eat these seeds, but little additional information is available. We studied Whitebark Pine in Banff National Park to address this information gap. Because bears obtain Whitebark Pine seeds from Red Squirrel (Tamiasciurus hudsonicus) middens, our objective was to measure the abundance, habitat characteristics, and use by bears of middens in Whitebark Pine forests. A second objective was to determine whether Grizzly Bears (U. arctos) in Banff National Park also eat Whitebark Pine seeds. In 2011–2012, we ran 29 ha of 20–50 m wide transects at 10 sites with accessible Whitebark Pine stands and found 0–3.7 middens/ha (mean 1.23, SD 1.17, n = 10). Midden density was weakly related to total basal area of all conifers but not to basal area of Whitebark Pine. Middens were located in the upper subalpine at an average elevation of 2110 m (SD 90, n = 8) on 41–248° facing slopes with a mean steepness of 28° (SD 5, n = 8). Bears had excavated middens at all eight sites where we found middens; at the remaining two sites, middens did not occur within our transects. Overall, 24 (67%) of the 36 middens located in our transects had been dug by bears. In October 2013, we searched areas where three global positioning system (GPS)-collared Grizzly Bears had been located in late September 2013 and found five recently dug middens located less than 6 m from GPS fixes. These observations are, to our knowledge, the first conclusive evidence that grizzly Bears in Banff National Park eat Whitebark Pine seeds. Because Whitebark Pine occurs at high elevations on steep slopes where human use is low, this resource may be important in keeping bears in habitat where risk of human-caused mortality is lower. Our results may assist managers responsible for conservation of bears in Banff National Park, where both American Black Bears and Grizzly Bears are subject to high levels of human-caused mortality.

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