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
Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem
Den entrance and emergence dates of grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem are important to management agencies that wish to minimize impacts of human activities on bears. Current estimates for grizzly bear denning events use data that were collected from 1975–80. We update these estimates by including data obtained from 1981–99. We used aerial telemetry data...
Authors
Mark A. Haroldson, Mark A. Ternent, Kerry A. Gunther, Charles C. Schwartz
Estimating the number of females with cubs-of-the-year in the Yellowstone grizzly bear population Estimating the number of females with cubs-of-the-year in the Yellowstone grizzly bear population
No abstract available.
Authors
K.A. Keating, C.C. Schwartz, M.A. Haroldson, D. Moody
Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 1990-2000 Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 1990-2000
The Yellowstone grizzly bear (Ursus arctos horribilis) has been expanding its range during the past 2 decades and now occupies historic habitats that had been vacant. A current understanding of the distribution of grizzly bears within the ecosystem is useful in the recovery process and to help guide the state and federal land management agencies and state wildlife agencies of Idaho...
Authors
Charles C. Schwartz, Mark A. Haroldson, Kerry A. Gunther, D. Moody
Negative binomial models for abundance estimation of multiple closed populations Negative binomial models for abundance estimation of multiple closed populations
Counts of uniquely identified individuals in a population offer opportunities to estimate abundance. However, for various reasons such counts may be burdened by heterogeneity in the probability of being detected. Theoretical arguments and empirical evidence demonstrate that the negative binomial distribution (NBD) is a useful characterization for counts from biological populations with
Authors
Mark S. Boyce, Darry I. MacKenzie, Bryan F.J. Manly, Mark A. Haroldson, David W. Moody
Effects of exotic species on Yellowstone's grizzly bears Effects of exotic species on Yellowstone's grizzly bears
Humans have affected grizzly bears (Ursus arctos horribilis) by direct mortality, competition for space and resources, and introduction of exotic species. Exotic organisms that have affected grizzly bears in the Greater Yellowstone Area include common dandelion (Taraxacum officinale), nonnative clovers (Trifolium spp.), domesticated livestock, bovine brucellosis (Brucella abortus), lake...
Authors
Daniel P. Reinhart, Mark A. Haroldson, D.J. Mattson, Kerry A. Gunther
Estimating numbers of females with cubs-of-the-year in the Yellowstone grizzly bear population Estimating numbers of females with cubs-of-the-year in the Yellowstone grizzly bear population
For grizzly bears (Ursus arctos horribilis) in the Greater Yellowstone Ecosystem (GYE), minimum population size and allowable numbers of human-caused mortalities have been calculated as a function of the number of unique females with cubs-of-the-year (FCUB) seen during a 3- year period. This approach underestimates the total number of FCUB, thereby biasing estimates of population size...
Authors
K.A. Keating, C.C. Schwartz, M.A. Haroldson, D. Moody
Science and Products
Filter Total Items: 90
Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem
Den entrance and emergence dates of grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem are important to management agencies that wish to minimize impacts of human activities on bears. Current estimates for grizzly bear denning events use data that were collected from 1975–80. We update these estimates by including data obtained from 1981–99. We used aerial telemetry data...
Authors
Mark A. Haroldson, Mark A. Ternent, Kerry A. Gunther, Charles C. Schwartz
Estimating the number of females with cubs-of-the-year in the Yellowstone grizzly bear population Estimating the number of females with cubs-of-the-year in the Yellowstone grizzly bear population
No abstract available.
Authors
K.A. Keating, C.C. Schwartz, M.A. Haroldson, D. Moody
Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 1990-2000 Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 1990-2000
The Yellowstone grizzly bear (Ursus arctos horribilis) has been expanding its range during the past 2 decades and now occupies historic habitats that had been vacant. A current understanding of the distribution of grizzly bears within the ecosystem is useful in the recovery process and to help guide the state and federal land management agencies and state wildlife agencies of Idaho...
Authors
Charles C. Schwartz, Mark A. Haroldson, Kerry A. Gunther, D. Moody
Negative binomial models for abundance estimation of multiple closed populations Negative binomial models for abundance estimation of multiple closed populations
Counts of uniquely identified individuals in a population offer opportunities to estimate abundance. However, for various reasons such counts may be burdened by heterogeneity in the probability of being detected. Theoretical arguments and empirical evidence demonstrate that the negative binomial distribution (NBD) is a useful characterization for counts from biological populations with
Authors
Mark S. Boyce, Darry I. MacKenzie, Bryan F.J. Manly, Mark A. Haroldson, David W. Moody
Effects of exotic species on Yellowstone's grizzly bears Effects of exotic species on Yellowstone's grizzly bears
Humans have affected grizzly bears (Ursus arctos horribilis) by direct mortality, competition for space and resources, and introduction of exotic species. Exotic organisms that have affected grizzly bears in the Greater Yellowstone Area include common dandelion (Taraxacum officinale), nonnative clovers (Trifolium spp.), domesticated livestock, bovine brucellosis (Brucella abortus), lake...
Authors
Daniel P. Reinhart, Mark A. Haroldson, D.J. Mattson, Kerry A. Gunther
Estimating numbers of females with cubs-of-the-year in the Yellowstone grizzly bear population Estimating numbers of females with cubs-of-the-year in the Yellowstone grizzly bear population
For grizzly bears (Ursus arctos horribilis) in the Greater Yellowstone Ecosystem (GYE), minimum population size and allowable numbers of human-caused mortalities have been calculated as a function of the number of unique females with cubs-of-the-year (FCUB) seen during a 3- year period. This approach underestimates the total number of FCUB, thereby biasing estimates of population size...
Authors
K.A. Keating, C.C. Schwartz, M.A. Haroldson, D. Moody