Results 201 to 210 of about 31,258 (246)

Bearing fruit: Piloting a novel judgment bias task in an American black bear

Zoo Biology, 2020
AbstractJudgment bias tasks can reveal changes in affect in animals as a function of environmental manipulations such as provision of enrichment. We assessed affect in an American black bear across seasonal changes in availability of a mulberry bush. We used a novel judgment bias task in which the background color of a touchscreen signaled whether the ...
Jennifer Vonk, Molly C. McGuire, Zoe Johnson‐Ulrich   +2 more
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Hibernation in the American Black Bear

American Midland Naturalist, 1954
During recent years considerable interest has been shown in the study of hibernation. However, there seems to be some confusion as to the meaning of the word when applied to different animals. Funk and Wagnalls's dictionary (1949) defines hibernation as the ability to "pass the winter . . . in a secluded place and in a torpid state, as certain animals."
Arthur Svihla, Howard S. Bowman
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Genetic architecture and evolution of color variation in American black bears

Current Biology, 2022
SUMMARY Color variation is a frequent evolutionary substrate for camouflage in small mammals but the underlying genetics and evolutionary forces that drive color variation in natural populations of large mammals are mostly unexplained.
Emily E. Puckett, Isis S. Davis, Dawn C. Harper, Kazumasa Wakamatsu, Gopal Battu, Jerrold L. Belant, Dean E. Beyer, Colin Carpenter, Anthony P. Crupi, Maria Davidson, Christopher S. DePerno, Nicholas Forman, Nicholas L. Fowler, David L. Garshelis, Nicholas Gould, Kerry Gunther, Mark Haroldson, Shosuke Ito, David Kocka, Carl Lackey, Ryan Leahy, Caitlin Lee-Roney, Tania Lewis, Ashley Lutto, Kelly McGowan, Colleen Olfenbuttel, Mike Orlando, Alexander Platt, Matthew D. Pollard, Megan Ramaker, Heather Reich, Jaime L. Sajecki, Stephanie K. Sell, Jennifer Strules, Seth Thompson, Frank van Manen, Craig Whitman, Ryan Williamson, Frederic Winslow, Christopher B. Kaelin, Michael S. Marks, Gregory S. Barsh   +41 more
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Breeding behavior of the American black bear Ursus americanus

Theriogenology, 2003
By means of videotape, we observed and timed courtship, mating, and refractoriness in the American black bear while confined in a semicaptive environment. Sixty-six courtships resulted in mating. During courtship, the male detected estrus and receptivity in the female. Courtship lasted 22.5+/-2.3s (mean+/-S.E.M.).
William R, Boone, M Elaine, Richardson, Jennifer A, Greer   +2 more
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Analysis of the blood of american black bears

Comparative Biochemistry and Physiology, 1966
Abstract 1. 1. Blood was obtained from 4 black bears ( Ursus americanus ), 9–10 months of age, weights 17–27 kg, which had been captive 1–3 months. Blood was removed by cardiac puncture into a heparinized syringe, and taken quickly to the laboratory. 2. 2.
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Ursus americanus (American black bear)

1967
One or two pairs of small acrocentrics often have secondary constrictions of the long arms near the centromere.
T. C. Hsu, Kurt Benirschke
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A harvest framework for a recovering American black bear population

The Journal of Wildlife Management, 2023
AbstractHaving reproducible and transparent science‐based processes in wildlife management ensures the integrity of decision making. These processes are particularly important when establishing harvest frameworks, as guiding information in the peer‐reviewed literature is limited.
Melanie R. Boudreau, Mariela G. Gantchoff, Laura Conlee, Charles Anderson, Nathaniel R. Bowersock, Jerrold L. Belant, Raymond B. Iglay   +6 more
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Density of American black bears in New Mexico

The Journal of Wildlife Management, 2018
ABSTRACTConsidering advances in noninvasive genetic sampling and spatially explicit capture–recapture (SECR) models, the New Mexico Department of Game and Fish sought to update their density estimates for American black bear (Ursus americanus) populations in New Mexico, USA, to aide in setting sustainable harvest limits. We estimated black bear density
Matthew J. Gould, James W. Cain, Gary W. Roemer, William R. Gould, Stewart G. Liley   +4 more
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Lactation, hibernation, and mass dynamics of American black bears and grizzly bears

Canadian Journal of Zoology, 1995
Milk composition and intake, cub growth, and mass loss of hibernating lactating and nonlactating American black bears (Ursus americanus) and grizzly bears (Ursus arctos horribilis) were investigated. Except for ash content, milk composition was similar between species.
Sean D. Farley, Charles T. Robbins
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Induction of pseudopregnancy in the American Black Bear (Ursus americanus)

Journal of Experimental Zoology Part A: Comparative Experimental Biology, 2003
AbstractThe aim of this study was to determine whether American Black Bears (Ursus americanus) can experience a pseudopregnancy of the same duration as pregnancy. To do this, we treated three nonmated, captive female bears with human chorionic gonadotropin (hCG) during one breeding season, and saline during another.
Laura Clamon, Schulz, Ralph A, Nelson, Leah M, Pyter, Janice M, Bahr   +3 more
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