Niche Separation Of Grizzly Ursus Arctos And American Black Bears Ursus Americanus In Yellowstone National Park
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Niche Separation Of Grizzly Ursus Arctos And American Black Bears Ursus Americanus In Yellowstone National Park
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Author : Jennifer Kay Fortin
language : en
Publisher:
Release Date : 2011
Niche Separation Of Grizzly Ursus Arctos And American Black Bears Ursus Americanus In Yellowstone National Park written by Jennifer Kay Fortin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Black bear categories.
Yellowstone S Wildlife In Transition
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Author : P. J. White
language : en
Publisher: Harvard University Press
Release Date : 2013-04-15
Yellowstone S Wildlife In Transition written by P. J. White and has been published by Harvard University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-15 with Nature categories.
The world's first national park, Yellowstone is a symbol of nature's enduring majesty and the paradigm of protected areas across the globe. But Yellowstone is constantly changing. How we understand and respond to events that are putting species under stress, say the authors of Yellowstone's Wildlife in Transition, will determine the future of ecosystems that were millions of years in the making. With a foreword by the renowned naturalist E. O. Wilson, this is the most comprehensive survey of research on North America's flagship national park available today. Marshaling the expertise of over thirty contributors, Yellowstone's Wildlife in Transition examines the diverse changes to the park's ecology in recent decades. Since its creation in the 1870s, the priorities governing Yellowstone have evolved, from intensive management designed to protect and propagate depleted large-bodied mammals to an approach focused on restoration and preservation of ecological processes. Recognizing the importance of natural occurrences such as fires and predation, this more ecologically informed oversight has achieved notable successes, including the recovery of threatened native species of wolves, bald eagles, and grizzly bears. Nevertheless, these experts detect worrying signs of a system under strain. They identify three overriding stressors: invasive species, private-sector development of unprotected lands, and a warming climate. Their concluding recommendations will shape the twenty-first-century discussion over how to confront these challenges, not only in American parks but for conservation areas worldwide. Highly readable and fully illustrated, Yellowstone's Wildlife in Transition will be welcomed by ecologists and nature enthusiasts alike.
Temporal Niche Switching By Grizzly Bears But Not American Black Bears In Yellowstone National Park
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Author : Jennifer Kay Fortin
language : en
Publisher:
Release Date : 2013
Temporal Niche Switching By Grizzly Bears But Not American Black Bears In Yellowstone National Park written by Jennifer Kay Fortin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Black bear categories.
Grizzly bears (Ursus arctos) have been reported as either nocturnal or diurnal in various studies, but have not been known to switch between the 2 times unless disturbed by humans. Black bears (Ursus americanus) are almost solely diurnal in studies unless human influences occur. Because human disturbance is often difficult to control, the relative temporal niche of both species remains ill-defined. Thus, the present study examined bears in Yellowstone National Park (Wyoming) where hunting does not occur, human activities are relatively benign, and bear species are sympatric to determine if niche occupancy was a stable feature of the species. Onset of activity was anticipatory of both sunrise or morning civil twilight (illumination sufficient for human vision) for individuals of either species. The peak hour of activity in black bears was consistently midday, but fluctuated in grizzly bears from midday during early spring, late summer, and fall to evening during late spring and early summer. Black bears did not temporally avoid the times when the more dominant grizzly bears were active. Mean activity levels were higher for male black bears than for both male and female grizzly bears. Together, results suggest that the foraging needs of black bears necessitate ingestion of less-digestible, lower-quality foods requiring longer foraging time during daytime hours, whereas grizzly bears adapt their diet to seasonally available food sources, necessitating greater temporal flexibility.
Wildlife Research Report
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Author :
language : en
Publisher:
Release Date : 2012
Wildlife Research Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Mammals categories.
Yellowstone Grizzly Bears
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Author : Daniel D. Bjornlie
language : en
Publisher: National Park Service Yellowstone National Park
Release Date : 2017
Yellowstone Grizzly Bears written by Daniel D. Bjornlie and has been published by National Park Service Yellowstone National Park this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Bear populations categories.
Yellowstone Grizzly Bear Investigations
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Author : Interagency Grizzly Bear Study Team
language : en
Publisher:
Release Date : 1977
Yellowstone Grizzly Bear Investigations written by Interagency Grizzly Bear Study Team and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Bears categories.
Are Black Bears A Factor In The Restoration Of North American Grizzly Bear Populations
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Author : David John Mattson
language : en
Publisher:
Release Date : 2005
Are Black Bears A Factor In The Restoration Of North American Grizzly Bear Populations written by David John Mattson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Grizzly bear categories.
We assess the potential for American black bears (Ursus americanus) to limit the growth of colonizing or severely reduced grizzly bear (Ursus arctos) populations. Managers are faced with the challenge of increasing the size of small (N
Niche Separation Amongst Sympatric Ursids Relative To Salmon Use
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Author : Jennifer Kay Fortin
language : en
Publisher:
Release Date : 2006
Niche Separation Amongst Sympatric Ursids Relative To Salmon Use written by Jennifer Kay Fortin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Black bear categories.
Roadside Bear Viewing Opportunities In Yellowstone National Park Characteristics Trends And Influence Of Whitebark Pine
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Author : Mark A. Haroldson
language : en
Publisher:
Release Date : 2013
Roadside Bear Viewing Opportunities In Yellowstone National Park Characteristics Trends And Influence Of Whitebark Pine written by Mark A. Haroldson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Black bear categories.
Opportunities for viewing grizzly bears (Ursus arctos) and American black bears (U. americanus) from roadways in Yellowstone National Park (YNP) have increased in recent years. Unlike the panhandling bears common prior to the 1970s, current viewing usually involves bears feeding on natural foods. We define roadside bear viewing opportunities that cause traffic congestion as "bear-jams." We investigated characteristics of bear-jams and their frequency relative to whitebark pine (Pinus albicaulis) cone production, an important fall food for bears, during 1990-2004. We observed a difference in diel distribution of bear-jams between species (X^2 = 70.609, 4 df, P
Relationships Between Activity Patterns And Foraging Strategies Of Yellowstone Grizzly Bears
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Author : Albert L. Harting
language : en
Publisher:
Release Date : 1985
Relationships Between Activity Patterns And Foraging Strategies Of Yellowstone Grizzly Bears written by Albert L. Harting and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Bears categories.