Mark Haroldson
Mark Haroldson is an emeritus USGS Wildlife Biologist for the Interagency Grizzly Bears Study Team and works out of the Northern Rocky Mountain Science Center, Bozeman, MT.
Research Interest
Mark has had a passion for bears since he began studying them as an undergraduate in 1976. He has worked in bear research and management in several western states ever since. Since 1984 he has worked in various capacities for the Interagency Grizzly Bear Study Team in the Greater Yellowstone Ecosystem. Current research is focused on mortality and population trend of grizzly bears in the Greater Yellowstone Ecosystem.
Education and Certifications
B.S. Wildlife Biology, 1979, University of Montana
Graduate level class work, 1982-88, University of Montana
Science and Products
Filter Total Items: 90
Modeling survival: application of the Andersen-Gill model to Yellowstone grizzly bears Modeling survival: application of the Andersen-Gill model to Yellowstone grizzly bears
Wildlife ecologists often use the Kaplan-Meier procedure or Cox proportional hazards model to estimate survival rates, distributions, and magnitude of risk factors. The Andersen-Gill formulation (A-G) of the Cox proportional hazards model has seen limited application to mark-resight data but has a number of advantages, including the ability to accommodate left-censored data, time-varying
Authors
Christopher J. Johnson, Mark S. Boyce, Charles C. Schwartz, Mark A. Haroldson
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2003 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2003
The contents of this Annual Report summarize results of monitoring and research from the 2003 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The study team continues to work on issues associated with counts of unduplicated females with cubs-of-the-year (COY). These counts are used to establish a minimum population...
Grizzly bear-human conflicts in the Yellowstone ecosystem, 1992-2000 Grizzly bear-human conflicts in the Yellowstone ecosystem, 1992-2000
For many years, the primary strategy for managing grizzly bears (Ursus arctos) that came into conflict with humans in the Greater Yellowstone Ecosystem (GYE) was to capture and translocate the offending bears away from conflict sites. Translocation usually only temporarily alleviated the problems and most often did not result in long-term solutions. Wildlife managers needed to be able to...
Authors
K.A. Gunther, M.A. Haroldson, S.L. Cain, J. Copeland, K. Frey, C.C. Schwartz
Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears
Spawning cutthroat trout (Oncorhynchus clarki (Richardson, 1836)) are a potentially important food resource for grizzly bears (Ursus arctos horribilis Ord, 1815) in the Greater Yellowstone Ecosystem. We developed a method to estimate the amount of cutthroat trout ingested by grizzly bears living in the Yellowstone Lake area. The method utilized (i) the relatively high, naturally...
Authors
L.A. Felicetti, C.C. Schwartz, R. O. Rye, K.A. Gunther, J.G. Crock, M.A. Haroldson, L. Waits, C.T. Robbins
Possible effects of elk harvest on fall distribution of grizzly bears in the Greater Yellowstone Ecosystem Possible effects of elk harvest on fall distribution of grizzly bears in the Greater Yellowstone Ecosystem
The tradition of early elk (Cervus elaphus) hunting seasons adjacent to Yellowstone National Park (YNP), USA, provides grizzly bears (Ursus arctos horribilis) with ungulate remains left by hunters. We investigated the fall (Aug–Oct) distribution of grizzly bears relative to the boundaries of YNP and the opening of September elk hunting seasons. Based on results from exact tests of...
Authors
M.A. Haroldson, C.C. Schwartz, S. Cherry, D. Moody
Grizzly bear Ursus arctos Grizzly bear Ursus arctos
No abstract available.
Authors
C.C. Schwartz, S.D. Miller, M.A. Haroldson
Science and Products
Filter Total Items: 90
Modeling survival: application of the Andersen-Gill model to Yellowstone grizzly bears Modeling survival: application of the Andersen-Gill model to Yellowstone grizzly bears
Wildlife ecologists often use the Kaplan-Meier procedure or Cox proportional hazards model to estimate survival rates, distributions, and magnitude of risk factors. The Andersen-Gill formulation (A-G) of the Cox proportional hazards model has seen limited application to mark-resight data but has a number of advantages, including the ability to accommodate left-censored data, time-varying
Authors
Christopher J. Johnson, Mark S. Boyce, Charles C. Schwartz, Mark A. Haroldson
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2003 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2003
The contents of this Annual Report summarize results of monitoring and research from the 2003 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The study team continues to work on issues associated with counts of unduplicated females with cubs-of-the-year (COY). These counts are used to establish a minimum population...
Grizzly bear-human conflicts in the Yellowstone ecosystem, 1992-2000 Grizzly bear-human conflicts in the Yellowstone ecosystem, 1992-2000
For many years, the primary strategy for managing grizzly bears (Ursus arctos) that came into conflict with humans in the Greater Yellowstone Ecosystem (GYE) was to capture and translocate the offending bears away from conflict sites. Translocation usually only temporarily alleviated the problems and most often did not result in long-term solutions. Wildlife managers needed to be able to...
Authors
K.A. Gunther, M.A. Haroldson, S.L. Cain, J. Copeland, K. Frey, C.C. Schwartz
Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears
Spawning cutthroat trout (Oncorhynchus clarki (Richardson, 1836)) are a potentially important food resource for grizzly bears (Ursus arctos horribilis Ord, 1815) in the Greater Yellowstone Ecosystem. We developed a method to estimate the amount of cutthroat trout ingested by grizzly bears living in the Yellowstone Lake area. The method utilized (i) the relatively high, naturally...
Authors
L.A. Felicetti, C.C. Schwartz, R. O. Rye, K.A. Gunther, J.G. Crock, M.A. Haroldson, L. Waits, C.T. Robbins
Possible effects of elk harvest on fall distribution of grizzly bears in the Greater Yellowstone Ecosystem Possible effects of elk harvest on fall distribution of grizzly bears in the Greater Yellowstone Ecosystem
The tradition of early elk (Cervus elaphus) hunting seasons adjacent to Yellowstone National Park (YNP), USA, provides grizzly bears (Ursus arctos horribilis) with ungulate remains left by hunters. We investigated the fall (Aug–Oct) distribution of grizzly bears relative to the boundaries of YNP and the opening of September elk hunting seasons. Based on results from exact tests of...
Authors
M.A. Haroldson, C.C. Schwartz, S. Cherry, D. Moody
Grizzly bear Ursus arctos Grizzly bear Ursus arctos
No abstract available.
Authors
C.C. Schwartz, S.D. Miller, M.A. Haroldson