Serum progesterone, oestradiol, luteinizing hormone and prolactin profiles in the female black bear (Ursus americanus)

1998 ◽  
Vol 53 (1-4) ◽  
pp. 107-118 ◽  
Author(s):  
T Tsubota ◽  
L Howell-Skalla ◽  
W.R Boone ◽  
D.L Garshelis ◽  
J.M Bahr
Keyword(s):  
Luteinizing Hormone ◽  
Ursus Americanus ◽  
Black Bear ◽  
Serum Progesterone

Dynamics of woodland caribou populations at the southern limit of their range in Saskatchewan

1998 ◽  
Vol 76 (2) ◽  
pp. 251-259 ◽  
Author(s):  
W James Rettie ◽  
François Messier
Keyword(s):  
Rangifer Tarandus ◽  
Ursus Americanus ◽  
Road Construction ◽  
Black Bear ◽  
Woodland Caribou ◽  
Serum Progesterone ◽  
Southern Limit ◽  
Disjunct Populations ◽  
Calf Survival ◽  
Proximate Causes

Woodland caribou (Rangifer tarandus caribou) in central Saskatchewan are aggregated into several spatially disjunct populations. Historical data indicate that some local populations were eliminated and that the regional metapopulation declined during the 1970s. Proximate causes of decline may have included hunting, severe winter weather, and the end of predator control, though the ultimate causes may relate to road construction and logging activity, which expanded after 1966. There has been no sport hunting since 1987, yet the caribou populations in the region appear to be declining. Based on serum progesterone levels, first conception by females occurred at 16 months and the overall pregnancy rate was 94%, and in addition the minimum parturition rate was 86%, all of which indicate adequate nutrition. The annual survival rate of adults was 84%, which is comparatively low, though similar to results from other studies on woodland caribou. We observed a low rate of calf recruitment (28 calves : 100 cows), which we suspect was due to predation. Wolves (Canis lupus) have long been thought to limit woodland caribou populations while subsisting on other ungulate prey, but we speculate that black bear (Ursus americanus) predation may be an important cause of poor calf survival.

Seasonal serum glucose, progesterone, and Cortisol levels of black bears (Ursus americanus)

1990 ◽  
Vol 68 (1) ◽  
pp. 183-187 ◽  
Author(s):  
Henry J. Harlow ◽  
Thomas D. I. Beck ◽  
Lisa M. Walters ◽  
Shelley S. Greenhouse
Keyword(s):  
Ursus Americanus ◽  
Black Bear ◽  
Serum Cortisol ◽  
Serum Glucose ◽  
Black Bears ◽  
Stress Exposure ◽  
Summer Period ◽  
Serum Progesterone ◽  
Fat Reserves ◽  
Different Seasons

Sixty-two black bears were captured at different seasons during the years 1983–1987. Bears were anesthetized in their dens during the winter and parts of the fall and spring, while bears captured during the summer were snared prior to anesthesia. Radioimmunoassays for both Cortisol and progesterone were validated on black bear serum. An improved, rapid progesterone radioimmunoassay for black bear serum is reported. Serum glucose demonstrated a tendency for reduction during spring. Serum progesterone levels did not demonstrate seasonal differences and were significantly higher in females only during the summer ovulatory/postestrus period. Serum Cortisol was significantly elevated during the winter denning period as compared with the summer period. We conclude that differences in serum progesterone, Cortisol, and glucose may not be indicators of stress exposure, but of seasonal reproductive states and metabolic utilization of fat reserves.

Reducing Human-Bear Conflicts: Bear-Resistant Trash Cans

EDIS ◽  
2017 ◽  
Vol 2017 (3) ◽  
Author(s):  
Ethan T. Noel ◽  
Elizabeth F. Pienaar ◽  
Mike Orlando
Keyword(s):  
Great Risk ◽  
Ursus Americanus ◽  
Black Bear ◽  
Food Sources ◽  
Vehicle Collisions ◽  
Wildlife Ecology ◽  
Human Food ◽  
Fact Sheet

The Florida black bear (Ursus americanus floridanus) is the only species of bear in Florida, with an estimated population of approximately 4,030 bears. Bears that eat garbage put themselves in danger. This 3-page fact sheet written by Ethan T. Noel, Elizabeth F. Pienaar, and and Mike Orlando and published by the Wildlife Ecology and Conservation Department explains how to secure human garbage from bears so that they don’t become reliant on human food sources, a condition that puts them at great risk of being killed from vehicle collisions, illegal shooting, or euthanasia.­http://edis.ifas.ufl.edu/uw429

Sarcoptic Mange and Pelodera Dermatitis in an American Black bear (Ursus americanus)

2008 ◽  
Vol 39 (2) ◽  
pp. 257-259 ◽  
Author(s):  
Scott D. Fitzgerald ◽  
Thomas M. Cooley ◽  
Melinda K. Cosgrove
Keyword(s):  
Ursus Americanus ◽  
Black Bear ◽  
Sarcoptic Mange ◽  
American Black Bear ◽  
American Black
Sign in / Sign up

Export Citation Format

Share Document