scholarly journals Grizzly bear (Ursus arctos horribilis) locomotion: gaits and ground reaction forces

2015 ◽  
Vol 218 (19) ◽  
pp. 3102-3109 ◽  
Author(s):  
C. L. Shine ◽  
S. Penberthy ◽  
C. T. Robbins ◽  
O. L. Nelson ◽  
C. P. McGowan
Keyword(s):  
Ursus Arctos ◽  
Grizzly Bear ◽  
Ground Reaction Forces ◽  
Ursus Arctos Horribilis ◽  
Reaction Forces

A grizzly bear from the Middle Wisconsin of Woodbridge, Ontario

1976 ◽  
Vol 13 (2) ◽  
pp. 341-347 ◽  
Author(s):  
Charles S. Churcher ◽  
Alan V. Morgan
Keyword(s):  
Ursus Arctos ◽  
Grizzly Bears ◽  
Grizzly Bear ◽  
Bone Fragment ◽  
Mammuthus Primigenius ◽  
Ursus Arctos Horribilis ◽  
Before And After ◽  
Lake Simcoe ◽  
Left Humerus ◽  
Woolly Mammoth

The distal end of the left humerus of a grizzly bear, Ursus arctos, has been recovered from above the Early Wisconsin Sunnybrook Till at Woodbridge, Ontario, from the same horizon that previously has yielded remains of the woolly mammoth, Mammuthus primigenius. The age of these specimens is estimated at 40 000–50 000 years BP, within the mid-Wisconsin, Port Talbot Interstadial. The only other recognized Canadian record of a grizzly bear east of Manitoba is from a gravel sequence at Barrie, near Lake Simcoe, Ontario, dated from a bone fragment to 11 700 ± 250 years BP. A specimen recovered in Toronto in 1913 from an Early Wisconsin horizon is also considered to represent the grizzly. Bears of the grizzly type, Ursus arctos-horribilis were present in Ontario before and after the Early and Late Wisconsin ice advances.

Grizzly bear digging sites for Hedysarum sulphurescens roots in southwestern Alberta

1984 ◽  
Vol 62 (12) ◽  
pp. 2571-2575 ◽  
Author(s):  
Anne C. Holcroft ◽  
Stephen Herrero
Keyword(s):  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Ursus Arctos ◽  
Function Analysis ◽  
Soil Surface ◽  
Grizzly Bears ◽  
Grizzly Bear ◽  
Rock Fragments ◽  
Ursus Arctos Horribilis ◽  
Steep Slopes

Characteristics of sites where Hedysarum sulphurescens Rydb. roots were extensively, less extensively, or not dug by grizzly bears Ursus arctos horribilis Ord. were analyzed in relation to topographic, vegetative, soil, and geologic features. Discriminant function analysis significantly separated dug and undug sites, but did not separate extensively and less extensively dug sites. Ease of breaking the soil surface, presence of shaly rock fragments, loose cobble and gravel, and steep slopes were characteristic of dug sites. The abundance of H. sulphurescens appeared less important than the loose nature of the substrate indicating that digging time was important in optimizing energetics.

Disseminated Pleomorphic Myofibrosarcoma in a Grizzly Bear (Ursus arctos horribilis)

2012 ◽  
Vol 147 (2-3) ◽  
pp. 376-380 ◽  
Author(s):  
A. Mete ◽  
L. Woods ◽  
D. Famini ◽  
M. Anderson
Keyword(s):  
Ursus Arctos ◽  
Grizzly Bear ◽  
Ursus Arctos Horribilis

scholarly journals Grizzly bear (Ursus arctos horribilis) locomotion: forelimb joint mechanics across speed in the sagittal and frontal planes

2017 ◽  
Vol 220 (7) ◽  
pp. 1322-1329 ◽  
Author(s):  
Catherine L. Shine ◽  
Charles T. Robbins ◽  
O. Lynne Nelson ◽  
Craig P. McGowan
Keyword(s):  
Ursus Arctos ◽  
Grizzly Bear ◽  
Joint Mechanics ◽  
Ursus Arctos Horribilis

Grizzly bear feeding activity at alpine army cutworm moth aggregation sites in northwest Montana

1998 ◽  
Vol 76 (2) ◽  
pp. 221-227 ◽  
Author(s):  
Don White, Jr. ◽  
Katherine C Kendall ◽  
Harold D Picton
Keyword(s):  
National Park ◽  
Ursus Arctos ◽  
Feeding Activity ◽  
Grizzly Bears ◽  
Glacier National Park ◽  
Grizzly Bear ◽  
Use Patterns ◽  
Ursus Arctos Horribilis ◽  
Early Fall ◽  
Minimum Numbers

Grizzly bears (Ursus arctos horribilis) consume army cutworm moths (Euxoa auxiliaris) from late June through mid-September at alpine moth aggregation sites in Glacier National Park, Montana. To better understand the importance of army cutworm moths to grizzly bears, we determined the sex and age classes and minimum numbers of grizzly bears foraging at known alpine moth aggregation sites, and documented the timing and use patterns of grizzly bears foraging in these areas. A minimum of 36 grizzly bears were observed 106 times feeding at 6 of 9 known moth aggregation sites from late June through mid-September in 1992-1995; no bears were observed on moth sites in 1993. Bears fed on moth aggregations disproportionately more at elevations >2561 m, on slopes between 31° and 45°, and on southwest-facing aspects. Lone adult grizzly bears appeared to be underrepresented and subadults overrepresented at moth sites. Moths are highly digestible; all parts are digested except for the exoskeleton. We propose that army cutworm moths are an important, high-quality, preferred summer and early-fall food for grizzly bears in Glacier National Park. We do not present any data that demonstrate an increase in the importance of moths when other foods fail.

scholarly journals Seasonal and Daily Activity of Two Zoo-Housed Grizzly Bears (Ursus arctos horribilis)

2020 ◽  
Vol 1 (1) ◽  
pp. 1-12
Author(s):  
Eduardo J. Fernandez ◽  
Ellen Yoakum ◽  
Nathan Andrews
Keyword(s):  
Daily Activity ◽  
Ursus Arctos ◽  
Time Of Day ◽  
Grizzly Bears ◽  
Grizzly Bear ◽  
Considerable Variability ◽  
Ursus Arctos Horribilis

Captive grizzly bears, like their wild counterparts, engage in considerable variability in their seasonal and daily activity. We documented the year-long activity of two grizzly bears located at the Woodland Park Zoo in Seattle, Washington. We found that behaviors emerged in relation to month-to-month, seasonal, and time of day (hour-to-hour) observations, and events that occurred on exhibit, such as daily feedings. Seventeen behaviors split into seven classes of behavior were observed during their on-exhibit time over a 13-month period. Inactivity was the most frequent class of responses recorded, with most inactive behaviors occurring during the winter months. Both stereotypic and non-stereotypic activity emerged during the spring and summer months, with stereotypic activity occurring most frequently in the morning and transitioning to non-stereotypic activity in the latter part of the day. Results are discussed with respect to how captive grizzly bear behaviors relate to their natural seasonal and daily activity, as well as how events, such as feeding times and enrichment deliveries, can be used to optimize overall captive bear welfare.

Effects of habitat quality and anthropogenic disturbance on grizzly bear (Ursus arctos horribilis) home-range fidelity

2015 ◽  
Vol 93 (11) ◽  
pp. 857-865 ◽  
Author(s):  
A.A. Sorensen ◽  
G.B. Stenhouse ◽  
M.L. Bourbonnais ◽  
T.A. Nelson
Keyword(s):  
Home Range ◽  
Habitat Quality ◽  
Industrial Development ◽  
Ursus Arctos ◽  
Rocky Mountain ◽  
Temporal Analysis ◽  
Home Ranges ◽  
Grizzly Bear ◽  
Ursus Arctos Horribilis ◽  
New Development

In the Rocky Mountain eastern slopes of Alberta, Canada, grizzly bears (Ursus arctos horribilis Ord, 1815) live in a landscape heavily impacted by industrial development and human disturbance. We characterized the role of changing habitat quality and new disturbance features on patterns of grizzly bear seasonal home-range fidelity and drift by comparing consecutive-year seasonal home ranges. We relied on the geographic technique “spatial–temporal analysis of moving polygons” (STAMP) to examine changes in habitat quality and new development between zones of home-range fidelity, expansion, and contraction. Areas considered to be high-quality habitat were selected at a greater frequency than available and retained in zones of home-range fidelity, but also vacated during home-range contraction. Areas of decreasing habitat quality were equally present in zones of contraction, expansion, and stability. The proportion of new forest harvest areas and roads developed within the past year did not differ between zones of home-range change, but the proportion of new well sites was higher in contraction zones than in stability zones. Our results showed that while considerable drift occurs, changes in habitat quality and recent anthropogenic disturbances cannot account for annual variation in home ranges, suggesting other important factors influencing behaviour and movement.

scholarly journals Systemic effects of a high saturated fat diet in grizzly bears (Ursus arctos horribilis)

2017 ◽  
Vol 95 (11) ◽  
pp. 797-807 ◽  
Author(s):  
D.R. Rivet ◽  
O.L. Nelson ◽  
C.A. Vella ◽  
H.T. Jansen ◽  
C.T. Robbins
Keyword(s):  
Fatty Acids ◽  
Ursus Arctos ◽  
Saturated Fatty Acids ◽  
Metabolic Effects ◽  
Food Sources ◽  
Grizzly Bears ◽  
Grizzly Bear ◽  
Omega 3 ◽  
Necrosis Factor Alpha ◽  
Ursus Arctos Horribilis

Food sources for North America’s grizzly bear (Ursus arctos horribilis Ord, 1815) population have changed as habitats have fragmented, altering available resources and putting bears in contact with unnatural foods. Bears have evolved mechanisms to tolerate obesity, and do not develop adverse health consequences despite storing massive amounts of body fat. Captive adult grizzly bears were used to determine the effects of dietary fat on health. Group 1 was fed a diet high in polyunsaturated fatty acids (PUFA) wherein 9.5% of available calories came from saturated fatty acids (SFA). Group 2 was fed a diet wherein 28.8% of calories came from SFA. Plasma fatty acids, serum lipid profiles, insulin, inflammatory markers, systolic and diastolic blood pressure, and cardiac function parameters were measured. Serum lipids, SFA, and insulin did not differ between the two groups, although omega-3 fatty acids differed. Bears eating the SFA diet had significantly higher circulating adiponectin, interleukin-7 and interleukin-15, and tumor necrosis factor-alpha. Mild, asymptomatic systolic and diastolic dysfunctions were detected by strain echocardiography in the SFA group. The SFA diet group exhibited higher diastolic arterial pressures. Even though mild metabolic derangements were observed, grizzly bears were remarkably resistant to metabolic effects of diets high in SFA.

Sign in / Sign up

Export Citation Format

Share Document