CRL: Mt Graham Red Squirrel Research Program- Publications and On-Going Research

On-Going and Future Research

As detailed throughout these web pages, the dynamic nature of the Pinaleño ecosystem requires frequent monitoring. These monitoring efforts chronicle fluctuations in squirrel abundance, food availability, vegetation composition, and weather. In addition, the Red Squirrel Monitoring Program (RSMP) is conducting basic and applied research on various aspects of the Pinaleño ecosystem. Current and future research projects will examine the impacts of introduced Abert's squirrels (Sciurus aberti) in the mountains and assess the mammalian community associated with the nutrient rich middens characteristic of red squirrels in coniferous forests. Furthermore, we endeavor to monitor survival, reproductive performance, and space use of the endangered red squirrels at a fine scale by carefully marking and observing squirrels from a distance and via radio telemetry. These data promise to provide critical insight on the demography and habitat use of Mt. Graham red squirrels in the ever-changing, high elevation forests of the Pinaleños. Revisit our web page for periodic updates on the status of these projects and to download reprints of research articles as they become available. Also visit John L. Koprowski's (Director of the RSMP) personal web page for a list of his current graduate students and their project titles.

Unpublished annual reports of the Mt. Graham red squirrel research project can be found here

Books -
Thorington, R. W., J. L. Koprowski, M. A. Steele, and J. Whatton. 2012. Squirrels of the World, Johns Hopkins University Press.
Sanderson, H. R., and J. L. Koprowski. 2009. The Last Refuge of the Mt. Graham Red Squirrel. University of Arizona Press, Tucson, AZ.
Steele, M. A., and J. L. Koprowski. 2001. North American Tree Squirrels. Smithsonian Institution Press: Washington, DC. 224 p.
Book Chapters -
Buecher, D.C., R. Sidner, J.L. Koprowski. 2010. Finding that 4-star diner or how bats might ‘anticipate’ productive foraging areas. Pp. 253-262 in: Halvorson, W., Schwalbe, C., Van Riper, C., III (eds.). Southwestern Desert Resources, University of Arizona Press.
Young, P. J. 1999. Red Squirrel, Tamiasciurus hudsonicus. In: Wilson, D.E., and S. Ruff, editors. The Smithsonian Book of North American Mammals. Smithsonian Institution Press: Washington, London. Pp. 460-461.
Young, P. J. 1994. Monitoring the Mount Graham Red Squirrel. In: Istock, C. A., and R. S. Hoffman,editors. Storm Over a Mountain Island. University of Arizona Press, Tucson. Pp. 227-246.
Book Reviews -
Chen, H.L., J.L. Koprowski. 2011. Book Review: Safe passages: highways, wildlife, and habitat connectivity. Journal of Mammalogy. 92: 1136-1141.
Peer-Reviewed Articles -
Blount, S.J., J.L. Koprowski. 2012. Small mammal response to post-fire conditions: case of the endangered Mount Graham red squirrel. Southwestern Naturalist. 57:8-15. PDF of Article
Chen, H. L. and J. L. Koprowski. 2013. Effects of roads on wildlife in Arizona: how far have we Traveled? In Gottfried, Gerald J.; Ffolliott, Peter F.; Gebow, Brooke S.; Eskew, Lane G.; Collins, Loa C., comps. 2013. Merging science and management in a rapidly changing world: Biodiversity and management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ. Proceedings. RMRS-P-67. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 593 p. PDF of Article
Cudworth, N. L., and J. L. Koprowski. 2013. Foraging and reproductive behavior of Arizona gray squirrels (Sciurus arizonensis): impacts of climatic variation. Journal of Mammalogy 94:683-690. PDF of Article
Cudworth, N.L., J.L. Koprowski. 2011. Importance of scale in nest-site selection in Arizona gray squirrels. Journal of Wildlife Management. 75: 1668–1674. PDF of Article
Cudworth, N.L., J.L. Koprowski. 2010. Microtus californicus. Mammalian Species. 42: 230-243. PDF of Article
Cudworth, N. L., and J. L. Koprowski. 2010. First record of range extension of the cliff chipmunk (Tamias dorsalis) into the Huachuca Mountians. Western North American Naturalist 70:418-420. PDF of Article
Cudworth, N.L., J.L. Koprowski. 2010. Influences of mating strategy on space use of Arizona gray squirrels. Journal of Mammalogy. 91: 1235-1241. PDF of Article
Derbridge, J. J., P. R. Krausman, and C. T. Darimont. 2012. Using Bayesian stable isotope mixing models to estimate wolf diet ina multi-prey ecosystem. The Journal of Wildlife Managment 76:1277-1289. PDF of Article
Doumas, S.L., J.L. Koprowski. 2013. Return of fire as a restoration tool: long-term effects of burn severity on habitat use by Mexican fox squirrels. Restoration Ecology 21:133-139. PDF of Article
Doumas, S. L., and J. L. Koprowski. 2013. Effect of heterogeneity in burn severity on Mexican fox squirrels following the retunr of fire. International Journal of Wildland Fire 22:405-413. PDF of Article
Edelman, A. J., J. L. Koprowski, and S. R. Bertelsen. 2009. Potential for nest site competition between native and exotic tree squirrels. Journal of Mammalogy 90: 167-174. PDF of Article
Edelman, A. J. and J. L. Koprowski. 2007. Communal nesting in asocial Abert's squirrels: the role of social thermoregulation and breeding strategy. Ethology 113: 147-154. Contact us for a PDF
Edelman, A. J. and J. L. Koprowski. 2006. Seasonal changes in home ranges of Abert's squirrels: Impact of mating season. Canadian Journal of Zoology 84: 404-411. PDF of Article
Edelman, A. J. and J. L. Koprowski. 2006. Characteristics of Abert's squirrel (Sciurus aberti) cavity nests. The Southwestern Naturalist 51(1): 64-70. PDF of Article
Edelman, A. J. and J. L. Koprowski. 2005. Selection of drey sites by Abert's squirrels in an introduced population. Journal of Mammalogy 86(6): 1220-1226. PDF of Article
Edelman, A. J., J. L. Koprowski, and J. L. Edelman. 2005. Kleptoparasitic behavior and species richness at Mt. Graham red squirrel middens. USDA Forest Service Proceedings RMRS-P-36: 395 - 398. PDF of Article
Edelman, A. J. and J. L. Koprowski. 2005. Diet and tree use of Abert's squirrels (Sciurus aberti) in a mixed-conifer forest. The Southwestern Naturalist 50(4): 461-465. PDF of Article
Fitak, R. R., J. L. Koprowski, and M. Culver. 2013. Severe reduction in genetic variation in a montane isolate: the endangered Mount Graham red squirrel (Tamiasciurus hudsonicus grahamensis). Conservation Genetics 14:1233-1241. PDF of Article
Gwinn, R. N., J. L. Koprowski, Jessen, R., and M. Merrick. 2012. Sciurus spadiceus (Rodentia: Sciuridae). Mammalian Species 44:59-63. PDF of Article
Gwinn, R.N., G.H. Palmer, J.L. Koprowski. 2011. Sigmodon arizonae. Mammalian Species. 43: 149 – 154. PDF of Article
Gwinn, R.N., G.H. Palmer, J.L. Koprowski. 2011. Virginia opossum (Didelphis virginiana virginiana) from Yavapai County, Arizona. Western North American Naturalist. 71:113-114. PDF of Article
Hale, S. L., J. L. Koprowski, and H. Hicks. 2013. Review of black-tailed prairie dog reintroduction strategies and site selection: Arizona reintroduction. In Gottfried, Gerald J.; Ffolliott, Peter F.; Gebow, Brooke S.; Eskew, Lane G.; Collins, Loa C., comps. 2013. Merging science and management in a rapidly changing world: Biodiversity and management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ. Proceedings. RMRS-P-67. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 593 p. PDF of Article
Harrison, R. L., M. J. Patrick, and C. G. Schmitt. 2003. Foxes, fleas, and plague in New Mexico. The Southwestern Naturalist 48(4): 720- 722. PDF of Article
Hutton, K. A., J. L. Koprowski, V. L. Greer, M. I. Alanen, C. A. Schauffert and P. J. Young. 2002. Use of Spruce-Fir and Mixed-Conifer Forests by an Introduced Population of Abert's Squirrels (Sciurus Aberti). The Southwestern Naturalist 48: 257-260. PDF of Article
Jessen, R. R., G. H. Palmer, and J. L. Koprowski. 2013. Neotropical pygmy squirrels (Sciurillus pusillus) share termite nests. Ecotropica 19:73-76. PDF of Article
Jessen, R. R., R. N. Gwinn, and J. L. K0prowski. 2013. Sciurillus pusillus (Rodentia: Sciuridae). Mammalian Species 49:75-79. PDF of Article
Jessen, R. R., G. H. Palmer, and J. L. Koprowski. 2013. Maternity nest of an Amazon red squirrel in a bromeliad. Mastozoología Neotropical 20:159-161. PDF of Article
Jessen, R., M.J. Merrick, J.L. Koprowski, O. Ramirez. 2010. Presence of Guayaquil squirrels on the central coast of Peru: an apparent introduction. Mammalia. 74: 443-444. PDF of Aricle
Ketcham, S. L. and J. L. Koprowski. 2013. Impacts on wildfire on wildlife in Arizona: A synthesis. In Gottfried, Gerald J.; Ffolliott, Peter F.; Gebow, Brooke S.; Eskew, Lane G.; Collins, Loa C., comps. 2013. Merging science and management in a rapidly changing world: Biodiversity and management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ. Proceedings. RMRS-P-67. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 593 p. PDF of Article
Koprowski, J. L., S. L. Doumas, M. J. Merrick, B. Oleson, E. E. Posthumus, T. G. Jessen, and R. N. Gwinn. 2013. It's lonely at the top: Biodiversity at risk to loss from climate change. In Gottfried, Gerald J.; Ffolliott, Peter F.; Gebow, Brooke S.; Eskew, Lane G.; Collins, Loa C., comps. 2013. Merging science and management in a rapidly changing world: Biodiversity and management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ. Proceedings. RMRS-P-67. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 593 p. PDF of Article
Koprowski, J. L. and R. Nandini. 2008. Global hotspots and knowledge gaps for tree and flying squirrels. Current Science 95: 851-856. PDF of Article
Koprowski, J. L., S. R. B. King, and M. J. Merrick. 2008. Expanded home ranges in a peripheral population: space use by endangered Mt. Graham red squirrels. Endangered Species Research, 4:227-232. Click here for online access
Koprowski, J. L., N. Ramos, B. S. Pasch, and C. A. Zugmeyer. 2006. Observations on the ecology of the endemic Mearns's squirrel (Tamiasciurus mearnsi). The Southwestern Naturalist 51(3): 426-430. PDF of Article
Koprowski, J. L., K. M. Leonard, C. A. Zugmeyer, and J. L. Jolley. 2006. Direct effects of fire on endangered Mount Graham red squirrels. The Southwestern Naturalist 51(1): 59-63. PDF of Article
Koprowski, J. L., M. I. Alanen, and A. M. Lynch. 2005. Nowhere to run and nowhere to hide: Response of endemic Mt. Graham red squirels to catastrophic forest damage. Biological Conservation 126: 491-498. PDF of Article
Koprowski, J. L. 2005. Annual cycles in body mass and reproduction of endangered Mt. Graham red squirrels. Journal of Mammalogy 86(2): 309-313. PDF of Article
Koprowski, J. L. 2005. Management and conservation of tree squirrels: The importance of endemism, species richness, and forest condition. USDA Forest Service Proceedings RMRS-P-36: 245-250.
PDF of Article
Koprowski, J. L., A. J. Edelman, B. S. Pasch, and D. C. Buecher. 2005. A dearth of data on the mammals of the Madrean archipelago: What we think we know and what we actually know. USDA Forest Service proceedings RMRS-P-36: 412- 415. PDF of Article
Koprowski, J. L. 2005. The response of tree squirrels to fragmentation: A review and synthesis. Animal Conservation 8: 369-376. PDF of Article
Koprowski, J. L. and M. C. Corse. 2005. Time budgets, activity periods, and behavior of mexican fox squirrels. Journal of Mammalogy 86(5): 947-952. PDF of Article

Koprowski, J. L. 2002. Handling tree squirrels with a safe and efficient restraint. Wildlife Society Bulletin 30: 101-103. PDF of Article (1.3 MB)
Koprowski, J. L. and M. C. Corse. 2001. Food habits of the Chiricahua fox squirrel (Sciurus nayaritensis chiricahuae). The Southwestern Naturalist 46(1): 62-65. PDF of Article
Koprowski, J. L. 1996. Natal philopatry, communal nesting, and kinship in fox squirrels and gray squirrels. Journal of Mammalogy 77(4): 1006-1016. PDF of Article
Koprowski, J. L. 1994. Sciurus niger. Mammalian Species 479: 1-9 . PDF of Article
Koprowski, J. L. 1994. Sciurus carolinensis. Mammalian Species 480: 1-9. PDF of Article
Koprowski, J. L. 1993. Alternative reproductive tactics in male eastern gray squirrels: "making the best of a bad job". Behavioral Ecology 4(2): 165-171. PDF of Article
Koprowski, J. L. 1993. The role of kinship in field interactions among juvenile gray squirrels (Sciurus carolinensis). Canadian Journal of Zoology 71: 224-226. PDF of Article
Koprowski, J. L. 1993. Behavioral tactics, dominance, and copulatory success among male fox squirrels. Ethology Ecology & Evolution 5: 169-176. PDF of Article
Koprowski, J. L. 1992. Removal of copulatory plugs by female tree squirrels. Journal of Mammalogy 73(3): 572-576. PDF of Article
Koprowski, J. L. 1991. Response of fox squirrels and gray squirrels to a late spring-early summer food shortage. Journal of Mammalogy 72(2): 367-372. PDF of Article
Koprowski, J. L. 1988. Longevity records for the fox squirrel. Journal of Mammalogy 69(2): 383-384 PDF of Article
Leonard, K. M. and J. L. Koprowski. 2009. A comparison of habitat use and demography of red squirrels at the southern edge of their range. American Midland Naturalist 162: 132-145. PDF of Article
Leonard, K. M. and J. L. Koprowski. 2009. Effects of fire on endangered Mt. Graham red squirrels (Tamiasciurus hudsonicus grahamensis): responses of individuals with known fates. Southwestern Naturalist 55:217-224. PDF of Article
Lurz, P. W. W., J. L. Koprowski, and D. J. Wood. 2008. The use of GIS and modelling approaches in squirrel population management and conservation: a review. Current Science 95(7): 918-922. PDF of Aricle
McDonald, L.L., T.R. Stanley, D.L. Otis, D.E. Biggins, P.D. Stevens, J.L. Koprowski, W. Ballard. 2011. Recommended methods for range-wide monitoring of prairie dogs in the United States: U.S. Geological Survey Scientific Investigations Report. 2011–5063, 36 p.
Merrick, M. J., S. L. Ketcham, and J. L. Koprowski. 2014. Sciurus ignitus (Rodentia: Sciuridae). Mammalian Species 46:93-100. PDF of Article
Merrick, M. J., J. L. Koprowski, and C. Wilcox. 2013. Into the third dimension: Benefits of incorporating LiDAR into wildlife habitat models. In Gottfried, Gerald J.; Ffolliott, Peter F.; Gebow, Brooke S.; Eskew, Lane G.; Collins, Loa C., comps. 2013. Merging science and management in a rapidly changing world: Biodiversity and management of the Madrean Archipelago III and 7th Conference on Research and Resource Management in the Southwestern Deserts; 2012 May 1-5; Tucson, AZ. Proceedings. RMRS-P-67. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 593 p. PDF of Article
Merrick, M. J., J. L. Koprowski, and R. N. Gwinn. 2012. Sciurus stramineus (Rodentia: Sciuridae). Mammalian Species 44: 44-50. PDF of Article
Merrick, M.J., J.L. Koprowski, R.N.Gwinn, G.H. Palmer, C.A. Zugmeyer. 2011. Surveys to determine the status of red squirrels in Guadalupe Mountains National Park, Texas. Southwestern Naturalist. 56: 24-28. PDF of Article
Merrick, M.J. R.N.Gwinn, R.L. Minor, R.R. Jessen, T.G. Jessen, V.L. Greer, J. L. Koprowski. 2010. Endangered Mount Graham Red Squirrel (Tamiasciurus hudsonicus grahamensis) uses nest following lightning strike. Southwestern Naturalist. 55: 123-124. PDF of Article
Merrick, M. J., S. R. Bertelsen, and J. L. Koprowski. 2007. Characteristics of Mount Graham red squirrel nest sites in a mixed conifer forest. The Journal of Wildlife Management 71: 1958-1963. PDF of Article
Munroe, K. E., and J. L. Koprowski. 2014. Levels of social behaviors and genetic structure in a population of round-tailed ground squirrels (Xerospermophilus tereticaudus). Behavioral Ecology and Sociobiology 68:629-638. PDF of Article
Munroe, K.E., and J.L. Koprowski. 2012. Presence of copulatory plugs in round-tailed ground squirrels (Xerospermophilus tereticaudus). Southwestern Naturalist. 57: 208-210. PDF of Article
Munroe, K.E., and J.L. Koprowski. 2011. Sociality, Bateman’s gradients and the polygynandrous genetic mating system of round-tailed ground squirrels (Xerospermophilus tereticaudus). Behavioral Ecology and Sociobiology. 65: 1811-1824. PDF of Article
Palmer, G. H., J. L. Koprowski, and A. J. Pernas. 2013. Nest tree and site selection of an introduced population of red-bellied squirrels (Sciurus aureogaster). Journal of Mammalogy 94:1274-1281. PDF of Article
Palmer, G. H., R. Nathan Gwinn, and J. E. Gwinn. 2009. Entanglement of a western screech-owl (Megascops kennicottii) in Coulter spiderling (Boerhaavia coulteri). The Southwestern Naturalist 54:523-524. PDF of Article
Palmer, G. H., J. L, Koprowski, and T. Pernas. 2008. Tree squirrels as invasive species: conservation and management implications. Pp 273 - 282 in G. L. Witmer, W. C. Pitt, K.A. Fagerstone (eds.), Managing vertebrate invasive species: proceedings of an international symposium. USDA/APHIS Wildlife Services, National Wildlife Research Center, Fort Collins, Colorado. PDF of Article.
Pasch, B. and J. L. Koprowski. 2006. Sex differences in space use of Chiricahua fox squirrels. Journal of Mammalogy 87(2): 380-386. PDF of Article
Pasch, B. S. and J. L. Koprowski. 2005. Correlates of vulnerability in Chiricahua fox squirrels. USDA Forest Service proceedings RMRS-P-36: 426-428. PDF of Article
Pasch, B.S., J.L. Koprowski. 2011. Impacts of fire suppression on space use of Mexican fox squirrels. Journal of Mammalogy. 92: 227-234 PDF of Article
Ramos-Lara, N., J. L. Koprowski, B. Kryštufek, and I. E. Hoffman. 2014. Spermophilus citellus (Rodentia: Sciuridae). Mammalian Species 46:71-87 PDF of Article
Ramos-Lara, N., J. L. Koprowski, and D. E. Swann. 2013. Nest-site characteristics of the montane endemic Mearns's squirrel (Tamiasciurus mearnsi): an obligate cavity-nester? Journal of Mammalogy 94:50-58. PDF of Article
Ramos-Lara, N., and J.L. Koprowski. 2012. Communal nesting behavior in Mearns’s squirrels (Tamiasciurus mearnsi). Southwestern Naturalist 57: 195-225. PDF of Article
Rushton, S. P., D. J. A. Wood, P. W. W. Lurz, and J. L. Koprowski. 2006. Modelling the population dynamics of the Mt. Graham red squirrel: Can we predict its future in a changing environment with multiple threats? Biological Conservation 131: 121-131. PDF of Article
Sanderson, H. R. and J. L. Koprowski, editors. 2009. The last refuge of the Mt. Graham red squirrel: ecology of endangerment. University of Arizona Press, Tucson. Order here!
Schauffert, C. A., J. L. Koprowski, V. L. Greer, M. I. Alanen, K. A. Hutton, and P. J. Young. 2002. Interactions Between Predators and Mt. Graham Red Squirrels (Tamiasciurus hudsonicus grahamensis). The Southwestern Naturalist 47: 498-501. PDF of Article
Scobie, E. H., R. R. Palmer, and J. L. Koprowski. 2014. Sciurus pyrrhinus (Rodentia: Sciuridae). Mammalian Species 46:88-92. PDF of Article
Steele, M. A., and J. L. Koprowski. 2001. North American Tree Squirrels. Smithsonian Institution Press: Washington, DC. 224 p.
Wood, D. J. A., S. Drake, S. P. Rushton, D. Rautenkranz, P. W. Lurz, and J. L. Koprowski. 2007. Fine-scale analysis of Mount Graham red squirrel habitat following disturbance. The Journal of Wildlife Management 71(7): 2357-2364. PDF of Article
Wood, D. J. A., J. L. Koprowski, and P. W. W. Lurz. 2007. Tree squirrel introductions: A theoretical approach with population viability analysis. Journal of Mammalogy 88(5): 1271-1279. PDF of Article
Wood, D. J. A. 2007. Forest disturbance and the long term population persistence of the Mt. Graham red squirrel: a spatially explicit modeling approach. M. S. Thesis. University of Arizona, Tucson, AZ. 119pp. Contact John L. Koprowski for more information.

Young, P. J. 1999. Red Squirrel, Tamiasciurus hudsonicus. In: Wilson, D.E., and S. Ruff, editors. The Smithsonian Book of North American Mammals. Smithsonian Institution Press: Washington, London. Pp. 460-461.

Young, P. J. 1994. Monitoring the Mount Graham Red Squirrel. In: Istock, C. A., and R. S. Hoffman, editors. Storm Over a Mountain Island. University of Arizona Press, Tucson. Pp. 227-246.

Young, P. J., V. L. Greer, and S. K. Six. 2002. Characteristics of Bolus Nests of Red Squirrels in the Pinaleño and White Mountains of Arizona. The Southwestern Naturalist 47: 267-275. PDF of Article (1.5 MB)
Zugmeyer, C. A. and J. L. Koprowski. 2009. Severely insect-damaged forest: A temporary trap for red squirrels? Forest Ecology and Management 257: 464-470. PDF of Article
Zugmeyer, C. A. and J. L. Koprowski. 2009. Habitat selection is unaltered after severe insect infestation: Concerns for forest-dependent species. Journal of Mammalogy 90: 175-182. PDF of Article
Zugmeyer, C. A. and J. L. Koprowski. 2007. Avian nestling predation by endangered Mt. Graham red squirrel. The Southwestern Naturalist 52(1): 155-157. PDF of Article
Zugmeyer, C. A. 2007. Trailblazers in the forest: response of endangered Mt. Graham red squirrels to severe insect infestation. M.S. Thesis. University of Arizona, Tucson, AZ. 73 pp. PDF available through the U of A library, or contact John L. Koprowski for more information.

MGRS Research Program Home
Natural History
Project History
Photos
Publications
MGRS Data
Annual Reports
CRL Home

 

Hot off the press!


click on the image to purchase

 


click the image to visit the University of Arizona press

From the Conservation Research Lab Blog