Frank T van Manen
Ph.D. 1994. Ecology and Statistics. University of Tennessee
B.S. and M.S. 1989. Wageningen Agricultural University, Netherlands
Frank van Manen is an ecologist who blends his research interest in large carnivores with landscape ecology. In 2012 Frank became Team Leader of the Interagency Grizzly Bear Study Team, a cooperative research team that addresses monitoring and research needs for the Greater Yellowstone grizzly bear population. His research focus for the past 25 years has been on bear ecology and management. Prior to his current research on Yellowstone grizzly bears, he conducted numerous studies on American black bears in the southeastern U.S. He has also collaborated on field studies with bear researchers in Ecuador (Andean bear), Sri Lanka (sloth bear), and China (giant panda).
Frank served as Treasurer and then President of the International Association for Bear Research and Management from 2001 through 2013 and is an Associate Editor for the Journal Ursus. He has adjunct appointments with Montana State University and the University of Tennessee.
Frank was born in Arnhem, The Netherlands and earned a combined B.S. and M.S. degree from Wageningen University. After an internship at the Department of Forestry, Wildlife and Fisheries, he entered the doctoral program at University of Tennessee with a major in Ecology and a minor in Statistics.
Formerly, Frank spent 12 years with the USGS Leetown Science Center specializing in (1) responses of mammals to landscape changes; (2) management of large carnivores; (3) international bear conservation; and (4) habitat models to support protection and restoration of plants and trees.
For available articles, click on the Publications tab.
Science and Products
The Interagency Grizzly Bear Study Team (IGBST) is an interdisciplinary group of scientists and biologists responsible for long-term monitoring and research efforts on grizzly bears in the Greater Yellowstone Ecosystem (GYE). The team was formed by the Department of the Interior (DOI) in 1973 as a direct result of controversy surrounding the closure of open pit garbage dumps within Yellowstone National Park during 1968-72. IGBST members are representatives from the U.S. Geological Survey, National Park Service, U.S. Fish and Wildlife Service, U.S. Forest Service, the Eastern Shoshone and Northern Arapaho Tribal Fish and Game Department, and the States of Idaho, Montana, and Wyoming. This interagency approach ensures consistency in data collection and allows for combining limited resources to address information needs throughout the GYE.
Yellowstone grizzly bears: Ecology and conservation of an icon of wildness
No abstract available.White, P.J.; Gunther, Kerry A.; van Manen, Frank T.
Using diets of Canis breeding pairs to assess resource partitioning between sympatric red wolves and coyotes
Foraging behaviors of red wolves (Canis rufus) and coyotes (Canis latrans) are complex and their ability to form congeneric breeding pairs and hybridize further complicates our understanding of factors influencing their diets. Through scat analysis, we assessed prey selection of red wolf, coyote, and congeneric breeding pairs formed by red wolves...Hinton, Joseph W.; Ashley, Annaliese K.; Dellinger, Justin A.; Gittleman, John L.; van Manen, Frank T.; Chamberlain, Michael J.
Space use and habitat selection by resident and transient red wolves (Canis rufus)
Recovery of large carnivores remains a challenge because complex spatial dynamics that facilitate population persistence are poorly understood. In particular, recovery of the critically endangered red wolf (Canis rufus) has been challenging because of its vulnerability to extinction via human-caused mortality and hybridization with coyotes (Canis...Hinton, Joseph W.; Proctor, Christine; Kelly, Marcella J.; van Manen, Frank T.; Vaughan, Michael R.; Chamberlain, Michael J.
Diet and macronutrient optimization in wild ursids: A comparison of grizzly bears with sympatric and allopatric black bears
When fed ad libitum, ursids can maximize mass gain by selecting mixed diets wherein protein provides 17 ± 4% of digestible energy, relative to carbohydrates or lipids. In the wild, this ability is likely constrained by seasonal food availability, limits of intake rate as body size increases, and competition. By visiting locations of 37...Costello, Cecily M; Cain, Steven L; Pils, Shannon R; Frattaroli, Leslie; Haroldson, Mark A.; van Manen, Frank T.
Detecting grizzly bear use of ungulate carcasses using global positioning system telemetry and activity data
Global positioning system (GPS) wildlife collars have revolutionized wildlife research. Studies of predation by free-ranging carnivores have particularly benefited from the application of location clustering algorithms to determine when and where predation events occur. These studies have changed our understanding of large carnivore behavior, but...Ebinger, Michael R.; Haroldson, Mark A.; van Manen, Frank T.; Costello, Cecily M; Bjornlie, Daniel D; Thompson, Daniel J.; Gunther, Kerry A.; Fortin, Jennifer K.; Teisberg, Justin E.; Pils, Shannon R; White, P J; Cain, Steven L; Cross, Paul C.
Density dependence, whitebark pine, and vital rates of grizzly bears
Understanding factors influencing changes in population trajectory is important for effective wildlife management, particularly for populations of conservation concern. Annual population growth of the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem, USA has slowed from 4.2–7.6% during 1983–2001 to 0.3–...van Manen, Frank T.; Haroldson, Mark A.; Bjornlie, Daniel D; Ebinger, Michael R.; Thompson, Daniel J.; Costello, Cecily M; White, Gary C.
Multiple estimates of effective population size for monitoring a long-lived vertebrate: An application to Yellowstone grizzly bears
Effective population size (Ne) is a key parameter for monitoring the genetic health of threatened populations because it reflects a population's evolutionary potential and risk of extinction due to genetic stochasticity. However, its application to wildlife monitoring has been limited because it is difficult to measure in natural populations. The...Kamath, Pauline L.; Haroldson, Mark A.; Luikart, Gordon; Paetkau, David; Whitman, Craig L.; van Manen, Frank T.
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...Gunther, Kerry A.; Shoemaker, Rebecca; Frey, Kevin L.; Haroldson, Mark A.; Cain, Steven L; van Manen, Frank T.; Fortin, Jennifer K.
Whitebark pine, population density, and home-range size of grizzly bears in the greater Yellowstone ecosystem
Changes in life history traits of species can be an important indicator of potential factors influencing populations. For grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem (GYE), recent decline of whitebark pine (WBP; Pinus albicaulis), an important fall food resource, has been paired with a slowing of population growth following...Daniel D, Bjornlie; van Manen, Frank T.; Michael R, Ebinger; Haroldson, Mark A.; Daniel J, Thompson; Cecily M, Costello
Use of isotopic sulfur to determine whitebark pine consumption by Yellowstone bears: a reassessment
Use of naturally occurring stable isotopes to estimate assimilated diet of bears is one of the single greatest breakthroughs in nutritional ecology during the past 20 years. Previous research in the Greater Yellowstone Ecosystem (GYE), USA, established a positive relationship between the stable isotope of sulfur (δ34S) and consumption of...Schwartz, Charles C.; Teisberg, Justin E.; Fortin, Jennifer K.; Haroldson, Mark A.; Servheen, Christopher; Robbins, Charles T.; van Manen, Frank T.
Influence of whitebark pine decline on fall habitat use and movements of grizzly bears in the Greater Yellowstone Ecosystem
When abundant, seeds of the high-elevation whitebark pine (WBP; Pinus albicaulis) are an important fall food for grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem. Rates of bear mortality and bear/human conflicts have been inversely associated with WBP productivity. Recently, mountain pine beetles (Dendroctonus ponderosae)...Costello, Cecily M; van Manen, Frank T.; Haroldson, Mark A.; Ebinger, Michael R.; Cain, Steven L; Gunther, Kerry A.; Bjornlie, Daniel D
Re-evaluation of Yellowstone grizzly bear population dynamics not supported by empirical data: response to Doak & Cutler
Doak and Cutler critiqued methods used by the Interagency Grizzly Bear Study Team (IGBST) to estimate grizzly bear population size and trend in the Greater Yellowstone Ecosystem. Here, we focus on the premise, implementation, and interpretation of simulations they used to support their arguments. They argued that population increases documented by...van Manen, Frank T.; Ebinger, Michael R.; Haroldson, Mark A.; Harris, Richard B.; Higgs, Megan D.; Cherry, Steve; White, Gary C.; Schwartz, Charles C.