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
Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem
During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded its range. Early efforts to model grizzly bear mortality were principally focused within the United States Fish and Wildlife Service Grizzly Bear Recovery Zone, which currently represents only about 61% of known bear distribution in the...
Authors
Charles C. Schwartz, Mark A. Haroldson, Gary C. White
Genetic analysis of individual origins supports isolation of grizzly bears in the Greater Yellowstone Ecosystem Genetic analysis of individual origins supports isolation of grizzly bears in the Greater Yellowstone Ecosystem
The Greater Yellowstone Ecosystem (GYE) supports the southernmost of the 2 largest remaining grizzly bear (Ursus arctos) populations in the contiguous United States. Since the mid-1980s, this population has increased in numbers and expanded in range. However, concerns for its long-term genetic health remain because of its presumed continued isolation. To test the power of genetic methods...
Authors
Mark A. Haroldson, Charles Schwartz, Katherine C. Kendall, Kerry A. Gunther, David S. Moody, Kevin L. Frey, David Paetkau
Evaluation of rules to distinguish unique female grizzly bears with cubs in Yellowstone Evaluation of rules to distinguish unique female grizzly bears with cubs in Yellowstone
The United States Fish and Wildlife Service uses counts of unduplicated female grizzly bears (Ursus arctos) with cubs-of-the-year to establish limits of sustainable mortality in the Greater Yellowstone Ecosystem, USA. Sightings are dustered into observations of unique bears based on an empirically derived rule set. The method has never been tested or verified. To evaluate the rule set...
Authors
C.C. Schwartz, M.A. Haroldson, S. Cherry, K.A. Keating
Observations of mixed-aged litters in brown bears Observations of mixed-aged litters in brown bears
We report on 3 cases of mixed-aged litters (young born in different years) in brown bears (Ursus arctos); in 1 instance the cub-of-the-year (hereafter called cubs) died in the den. Two cases occurred in Sweden after mothers were separated from their young during the breeding season. In one, the mother was separated from the accompanying cub for at least 12.5 hours and possibly up to 3.3...
Authors
J. E. Swenson, M.A. Haroldson
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2006 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2006
The contents of this Annual Report summarize results of monitoring and research from the 2006 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The Interagency Grizzly Bear Study Team (IGBST) continues to work on issues associated with counts of unduplicated females with cubs-of- the-year (COY). These counts are used...
Population growth of Yellowstone grizzly bears: Uncertainty and future monitoring Population growth of Yellowstone grizzly bears: Uncertainty and future monitoring
Grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem of the US Rocky Mountains have recently increased in numbers, but remain vulnerable due to isolation from other populations and predicted reductions in favored food resources. Harris et al. (2006) projected how this population might fare in the future under alternative survival rates, and in doing so estimated the rate of...
Authors
R.B. Harris, Gary C. White, C.C. Schwartz, M.A. Haroldson
Science and Products
Filter Total Items: 90
Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem
During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded its range. Early efforts to model grizzly bear mortality were principally focused within the United States Fish and Wildlife Service Grizzly Bear Recovery Zone, which currently represents only about 61% of known bear distribution in the...
Authors
Charles C. Schwartz, Mark A. Haroldson, Gary C. White
Genetic analysis of individual origins supports isolation of grizzly bears in the Greater Yellowstone Ecosystem Genetic analysis of individual origins supports isolation of grizzly bears in the Greater Yellowstone Ecosystem
The Greater Yellowstone Ecosystem (GYE) supports the southernmost of the 2 largest remaining grizzly bear (Ursus arctos) populations in the contiguous United States. Since the mid-1980s, this population has increased in numbers and expanded in range. However, concerns for its long-term genetic health remain because of its presumed continued isolation. To test the power of genetic methods...
Authors
Mark A. Haroldson, Charles Schwartz, Katherine C. Kendall, Kerry A. Gunther, David S. Moody, Kevin L. Frey, David Paetkau
Evaluation of rules to distinguish unique female grizzly bears with cubs in Yellowstone Evaluation of rules to distinguish unique female grizzly bears with cubs in Yellowstone
The United States Fish and Wildlife Service uses counts of unduplicated female grizzly bears (Ursus arctos) with cubs-of-the-year to establish limits of sustainable mortality in the Greater Yellowstone Ecosystem, USA. Sightings are dustered into observations of unique bears based on an empirically derived rule set. The method has never been tested or verified. To evaluate the rule set...
Authors
C.C. Schwartz, M.A. Haroldson, S. Cherry, K.A. Keating
Observations of mixed-aged litters in brown bears Observations of mixed-aged litters in brown bears
We report on 3 cases of mixed-aged litters (young born in different years) in brown bears (Ursus arctos); in 1 instance the cub-of-the-year (hereafter called cubs) died in the den. Two cases occurred in Sweden after mothers were separated from their young during the breeding season. In one, the mother was separated from the accompanying cub for at least 12.5 hours and possibly up to 3.3...
Authors
J. E. Swenson, M.A. Haroldson
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2006 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2006
The contents of this Annual Report summarize results of monitoring and research from the 2006 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The Interagency Grizzly Bear Study Team (IGBST) continues to work on issues associated with counts of unduplicated females with cubs-of- the-year (COY). These counts are used...
Population growth of Yellowstone grizzly bears: Uncertainty and future monitoring Population growth of Yellowstone grizzly bears: Uncertainty and future monitoring
Grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem of the US Rocky Mountains have recently increased in numbers, but remain vulnerable due to isolation from other populations and predicted reductions in favored food resources. Harris et al. (2006) projected how this population might fare in the future under alternative survival rates, and in doing so estimated the rate of...
Authors
R.B. Harris, Gary C. White, C.C. Schwartz, M.A. Haroldson