Campus Address: Classroom Building A215
My research interests include Quaternary paleoecology, paleoclimatology, biogeography, and global change, and I am especially interested in understanding changing environmental conditions in arid environments from the last ice age until present. I use macrofossils from packrat middens (their dens) to reconstruct vegetation and climate in the western United States and South America.
I teach biogeography, global change, paleoclimatology, physical geography, and research methods courses. I endeavor to incorporate innovative, learner-centered activities and high-impact teaching practices into my courses. I was also recently part of a team that developed an InTeGrate curriculum module entitled “The Changing Biosphere.” InTeGrate is an NSF-funded Science, Technology, Engineering, and Mathematics Talent Expansion Program (STEP) that seeks to create a series of modules for introductory geoscience courses aimed at addressing societal issues and developing Earth literacy.
Holmgren, C.A. 2017. The biodiversity crisis—Are humans causing a sixth mass extinction? Published online as part of Integrate’s Changing Biosphere module for undergraduate instruction. http://serc.carleton.edu/integrate/teaching_materials/biosphere/student_...
*Borrelli, M.P. and Holmgren, C.A. 2016. Dietary modifications of packrats in response to changing plant communities: Evidence from fossil plant cuticles spanning >55,000 years in Sonoran Desert packrat middens. Journal of Arid Environments 138, 1-8.
Holmgren, C.A., Betancourt, J.L., Peñalba, M.C., Delgadillo, J., Zuravnsky, K., Hunter, K.L., Rylander, K.A., Weiss, J.L. 2014. Evidence against a Pleistocene desert refugium in the lower Colorado River Basin. Journal of Biogeography 41, 1769-1780.
Zinniker, D.A., Holmgren, C.A., and Simoneit, B.R.T. 2013. Enterolactone and Other Lignan Metabolites as Taxon-Specific Markers in Modern and Ancient Woodrat Middens. Zeitschrift für Naturforschung C. 68c, 327-335.
Holmgren, C.A., Betancourt, J.L., and K.A. Rylander. 2011. Vegetation history along the eastern, desert escarpment of the Sierra San Pedro Mártir, Baja California, Mexico. Quaternary Research 75, 647-657.
Holmgren, C.A., Betancourt, J.L., and K.A. Rylander. 2010. A long-term vegetation history of the Mojave/Colorado Desert ecotone at Joshua Tree National Park. Journal of Quaternary Science 25, 222-236.
Placzek, C., Quade, J., Betancourt, J.L., Patchett, P.J., Rech, J.A., Latorre, C., Matmon, A., Holmgren, C.A., and English, N.B. 2009. Climate in the dry, central Andes over geologic, millennial, and interannual timescales. Annals of the Missouri Botanical Gardens 96, 386-397.
Holmgren, C. A., Rosello, E., Latorre, C., and Betancourt, J. L. 2008. Late Holocene fossil rodent middens from the Arica region of northernmost Chile. Journal of Arid Environments 72, 677-686.
Holmgren, C.A. 2007. Paleoenvironmental response of the northern Chihuahuan Desert to the Bølling/Allerød-Younger Dryas climatic oscillation. Invited paper for Current Research in the Pleistocene 24, 7-10.
Holmgren, C.A. 2007. Book review of Dry Borders: Great Natural Reserves of the Sonoran Desert. Felger, R. S. and Broyles, B. The Quarterly Review of Biology 82, 304.
Holmgren, C.A., Norris, J., and Betancourt, J.L. 2007. Inferences about winter temperatures and summer rains from the late Quaternary record of C4 perennial grasses and C3 desert shrubs in the northern Chihuahuan Desert. Journal of Quaternary Science 22, 141-161.
Holmgren, C. A., Betancourt, J.L., and Rylander, K. A. 2006. A 36,000-yr B.P. vegetation history from the Peloncillo Mountains, southeastern Arizona, USA. Palaeogeography, Palaeoclimatology, Palaeoecology 240, 405-422.
Latorre, C. L., Betancourt, J. L., Rech, J. A., Quade, J., Holmgren, C.A., Placzek, C. P., Vuille, M., and Rylander, K. A. 2005. Late Quaternary History of the Atacama Desert. In M. Smith & P. Hesse, Eds., 23° South: Archaeology and Environmental History of the Southern Deserts. National Museum of Australia Press, Canberra.
Holmgren, C. A., Peñalba, M. C., Rylander, K. A. and Betancourt, J. L. 2003. A 16,000 14C yr BP packrat midden series from the U.S.A.-Mexico Borderlands. Quaternary Research 60, 319-329.
Holmgren, C. A., Betancourt, J. L., Rylander, K. A., Roque, J., Tovar, O., Zeballos, H., Linares, E., and Quade, J. 2001. Holocene vegetation history from fossil rodent middens near Arequipa, Peru. Quaternary Research 56, 242-251.
*Indicates student co-author
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