Duane Diefenbach, Ph.D.
- B.S., Washington State University (1985)
- M.S., University of Maine (1988)
- Ph.D., University of Georgia (1992)
Academic Interests:Wildlife ecology, estimation of population parameters, and harvest management of game populations
Affiliated Programs:Pennsylvania Cooperative Fish and Wildlife Research Unit
Estimation of Fish and Wildlife Population Parameters
I am active in The Wildlife Society and a Certified Wildlife Biologist. I have served as associate editor for The Journal of Wildlife Management, vice president of the Northeast Section, and chair of the Biometrics Working Group. I encourage graduate students in my lab to actively participate in The Wildlife Society at the state, regional, and national levels. Also, I am a member of The Biometric Society and The Ecological Society of America.
Recent Research/Educational Projects:
Ecology and Management of White-tailed Deer My students and I have been collaborating with the Pennsylvania Game Commission since 2000 on a series of research projects on deer and deer hunters. This work has included studying survival and causes of mortality in fawns, effects of antler restriction regulations on harvest rates and dispersal in bucks, and the spatial distribution of hunters and deer harvest as influenced by roads and landscape characteristics. Current research is evaluating the assumptions underlying the model the PGC uses to monitor deer population trends, investigating the effect of shortened antlerless hunting seasons on harvest rates, and studying dispersal in female deer.
Black Bear Population and Harvest Characteristics Pennsylvania's black bear population has the highest reproductive rates of anywhere in the world. Annually, Pennsylvania harvests approximately 20% of a population of about 12,000 bears. In collaboration with the Pennsylvania Game Commission, I have been studying factors that influence the harvest rate to develop more accurate and efficient population estimators.
Use of Reclaimed Surface Mines by Grassland Birds: Identifying Strategies to Conserve and Manage Grassland Landscapes for Viable Songbird Populations We have estimated densities of several species of grassland sparrows on reclaimed surface mines in western Pennsylvania (Mattice et al. 2005). Henslow's Sparrow densities range from 0.65 singing males/ha on high quality reclaimed mine areas to 0.10 singing males/ha on lesser quality reclaimed habitats. My research interest in this area has focused on methods of estimating abundance whereas my students have been studying nest success (Stauffer et al. 2011) and population response of grassland sparrows to removal of invasive shrubs.
Buderman, F. E., D. R. Diefenbach, C. S. Rosenberry, B. D. Wallingford, and E. S. Long. 2014. Effect of hunter selectivity on harvest rates of radio-collared white-tailed deer in Pennsylvania. Journal of Wildlife Management DOI: 10.1002/jwmg.779.
Norton, A. S., D. R. Diefenbach, B. D. Wallingford, C. S. Rosenberry. 2012. Spatio-Temporal Variation in Male White-Tailed Deer Harvest Rates in Pennsylvania: Implications for Estimating Abundance. Journal of Wildlife Management 76:136-143.
Stauffer, G. E., D. R. Diefenbach, M. Marshall, and D. Brauning. 2011. Nest success of grassland sparrows on reclaimed surface mines. Journal of Wildlife Management 75:548-557.
Conn, P. B., D. R. Diefenbach, J. L. Laake, M. A. Ternent, and G. C. White. 2008. Bayesian analysis of wildlife age-at-harvest data. Biometrics 64:1170-1177.
Diefenbach, D. R., M. R. Marshall, J. A. Mattice, and D. W. Brauning. 2007. Incorporating availability for detection in estimates of bird abundance. Auk 124:96-106.
Diefenbach, D. R., J. L. Laake, and G. L. Alt. 2004. Spatio-temporal and demographic variation in the harvest of black bears: implications for population estimation. Journal of Wildlife Management 68: 947-959.
Stedman, R. S., D. R. Diefenbach, C. B. Swope, J. C. Finley, A. E. Luloff, H. C. Zinn. 2004. Integrating wildlife and human dimensions research methods to study hunters. Journal of Wildlife Management 68: 762-773.