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: 91
Methods to estimate distribution and range extent of grizzly bears in the Greater Yellowstone Ecosystem Methods to estimate distribution and range extent of grizzly bears in the Greater Yellowstone Ecosystem
The distribution of the Greater Yellowstone Ecosystem grizzly bear ( Ursus arctos) population has expanded into areas unoccupied since the early 20th century. Up-to-date information on the area and extent of this distribution is crucial for federal, state, and tribal wildlife and land managers to make informed decisions regarding grizzly bear management. The most recent estimate of...
Authors
Mark A. Haroldson, Charles C. Schwartz, Daniel J. Thompson, Daniel D. Bjornlie, Kerry A. Gunther, Steven L. Cain, Daniel B. Tyers, Kevin L. Frey, Bryan C. Aber
Contrasting past and current numbers of bears visiting Yellowstone cutthroat trout streams Contrasting past and current numbers of bears visiting Yellowstone cutthroat trout streams
Spawning cutthroat trout ( Oncorhynchus clarkii bouvieri) were historically abundant within tributary streams of Yellowstone Lake within Yellowstone National Park and were a highly digestible source of energy and protein for Yellowstone’s grizzly bears ( Ursus arctos) and black bears ( U. americanus). The cutthroat trout population has subsequently declined since the introduction of non...
Authors
Mark A. Haroldson, Charles C. Schwartz, Justin E. Teisberg, Kerry A. Gunther, Jennifer K. Fortin, Charles T. Robbins
Yellowstone grizzly bear investigations—Annual report of the Interagency Grizzly Bear Study Team 2013 Yellowstone grizzly bear investigations—Annual report of the Interagency Grizzly Bear Study Team 2013
This Annual Report summarizes results of grizzly bear (Ursus arctos) monitoring and research conducted in the Greater Yellowstone Ecosystem (GYE) by the Interagency Grizzly Bear Study Team (IGBST) during 2013. The report also contains a summary of nuisance grizzly bear management actions.
Dietary breadth of grizzly bears in the Greater Yellowstone Ecosystem Dietary breadth of grizzly bears in the Greater Yellowstone Ecosystem
Grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem (GYE) are opportunistic omnivores that eat a great diversity of plant and animal species. Changes in climate may affect regional vegetation, hydrology, insects, and fire regimes, likely influencing the abundance, range, and elevational distribution of the plants and animals consumed by GYE grizzly bears. Determining the...
Authors
Kerry A. Gunther, Rebecca Shoemaker, Kevin L. Frey, Mark A. Haroldson, Steven L. Cain, Frank T. van Manen, Jennifer K. Fortin
Response of Yellowstone grizzly bears to changes in food resources: A synthesis. Final report to the Interagency Grizzly Bear Committee and Yellowstone Ecosystem Subcommittee Response of Yellowstone grizzly bears to changes in food resources: A synthesis. Final report to the Interagency Grizzly Bear Committee and Yellowstone Ecosystem Subcommittee
The Yellowstone grizzly bear (Ursus arctos) was listed as a threatened species in 1975 (Federal Register 40 FR:31734-31736). Since listing, recovery efforts have focused on increasing population size, improving habitat security, managing bear mortalities, and reducing bear-human conflicts. The Interagency Grizzly Bear Committee (IGBC; partnership of federal and state agencies responsible...
Authors
Frank T. van Manen, Cecily M. Costello, Mark A. Haroldson, Daniel D. Bjornlie, Michael R. Ebinger, Kerry A. Gunther, Mary Frances Mahalovich, Daniel J. Thompson, Megan D. Higgs, Kathryn M. Irvine, Kristin Legg, Daniel B. Tyers, Lisa Landenburger, Steven L. Cain, Kevin L. Frey, Bryan C. Aber, Charles C. Schwartz
Insights into the latent multinomial model through mark-resight data on female grizzly bears with cubs-of-the-year Insights into the latent multinomial model through mark-resight data on female grizzly bears with cubs-of-the-year
Mark-resight designs for estimation of population abundance are common and attractive to researchers. However, inference from such designs is very limited when faced with sparse data, either from a low number of marked animals, a low probability of detection, or both. In the Greater Yellowstone Ecosystem, yearly mark-resight data are collected for female grizzly bears with cubs-of-the...
Authors
Megan D. Higgs, William A. Link, Gary C. White, Mark A. Haroldson, Daniel D. Bjornlie
Science and Products
Filter Total Items: 91
Methods to estimate distribution and range extent of grizzly bears in the Greater Yellowstone Ecosystem Methods to estimate distribution and range extent of grizzly bears in the Greater Yellowstone Ecosystem
The distribution of the Greater Yellowstone Ecosystem grizzly bear ( Ursus arctos) population has expanded into areas unoccupied since the early 20th century. Up-to-date information on the area and extent of this distribution is crucial for federal, state, and tribal wildlife and land managers to make informed decisions regarding grizzly bear management. The most recent estimate of...
Authors
Mark A. Haroldson, Charles C. Schwartz, Daniel J. Thompson, Daniel D. Bjornlie, Kerry A. Gunther, Steven L. Cain, Daniel B. Tyers, Kevin L. Frey, Bryan C. Aber
Contrasting past and current numbers of bears visiting Yellowstone cutthroat trout streams Contrasting past and current numbers of bears visiting Yellowstone cutthroat trout streams
Spawning cutthroat trout ( Oncorhynchus clarkii bouvieri) were historically abundant within tributary streams of Yellowstone Lake within Yellowstone National Park and were a highly digestible source of energy and protein for Yellowstone’s grizzly bears ( Ursus arctos) and black bears ( U. americanus). The cutthroat trout population has subsequently declined since the introduction of non...
Authors
Mark A. Haroldson, Charles C. Schwartz, Justin E. Teisberg, Kerry A. Gunther, Jennifer K. Fortin, Charles T. Robbins
Yellowstone grizzly bear investigations—Annual report of the Interagency Grizzly Bear Study Team 2013 Yellowstone grizzly bear investigations—Annual report of the Interagency Grizzly Bear Study Team 2013
This Annual Report summarizes results of grizzly bear (Ursus arctos) monitoring and research conducted in the Greater Yellowstone Ecosystem (GYE) by the Interagency Grizzly Bear Study Team (IGBST) during 2013. The report also contains a summary of nuisance grizzly bear management actions.
Dietary breadth of grizzly bears in the Greater Yellowstone Ecosystem Dietary breadth of grizzly bears in the Greater Yellowstone Ecosystem
Grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem (GYE) are opportunistic omnivores that eat a great diversity of plant and animal species. Changes in climate may affect regional vegetation, hydrology, insects, and fire regimes, likely influencing the abundance, range, and elevational distribution of the plants and animals consumed by GYE grizzly bears. Determining the...
Authors
Kerry A. Gunther, Rebecca Shoemaker, Kevin L. Frey, Mark A. Haroldson, Steven L. Cain, Frank T. van Manen, Jennifer K. Fortin
Response of Yellowstone grizzly bears to changes in food resources: A synthesis. Final report to the Interagency Grizzly Bear Committee and Yellowstone Ecosystem Subcommittee Response of Yellowstone grizzly bears to changes in food resources: A synthesis. Final report to the Interagency Grizzly Bear Committee and Yellowstone Ecosystem Subcommittee
The Yellowstone grizzly bear (Ursus arctos) was listed as a threatened species in 1975 (Federal Register 40 FR:31734-31736). Since listing, recovery efforts have focused on increasing population size, improving habitat security, managing bear mortalities, and reducing bear-human conflicts. The Interagency Grizzly Bear Committee (IGBC; partnership of federal and state agencies responsible...
Authors
Frank T. van Manen, Cecily M. Costello, Mark A. Haroldson, Daniel D. Bjornlie, Michael R. Ebinger, Kerry A. Gunther, Mary Frances Mahalovich, Daniel J. Thompson, Megan D. Higgs, Kathryn M. Irvine, Kristin Legg, Daniel B. Tyers, Lisa Landenburger, Steven L. Cain, Kevin L. Frey, Bryan C. Aber, Charles C. Schwartz
Insights into the latent multinomial model through mark-resight data on female grizzly bears with cubs-of-the-year Insights into the latent multinomial model through mark-resight data on female grizzly bears with cubs-of-the-year
Mark-resight designs for estimation of population abundance are common and attractive to researchers. However, inference from such designs is very limited when faced with sparse data, either from a low number of marked animals, a low probability of detection, or both. In the Greater Yellowstone Ecosystem, yearly mark-resight data are collected for female grizzly bears with cubs-of-the...
Authors
Megan D. Higgs, William A. Link, Gary C. White, Mark A. Haroldson, Daniel D. Bjornlie