Christine M. Drea
Earl D. McLean Professor
I have two broad research interests, sexual differentiation and social behavior, both focused on hyenas and primates. I am particularly interested in unusual species in which the females display a suite of masculinized characteristics, including male- like or exaggerated external genitalia and social dominance. The study of naturally occurring hormones in such unique mammals can reveal general processes of hormonal activity, expressed in genital morphology, reproductive development, and social behavior. Taking a combined laboratory and field approach allows me to relate captive data to various facets of the animals' natural habitat, thereby enhancing the ecological validity of assay procedures and enriching interpretation in an evolutionary framework. The goal of comparative studies of hyenas and lemurs is to help elucidate the mechanisms of mammalian sexual differentiation.
My research program in social behavior focuses on social learning and group cohesion. Using naturalistic tasks that I present to captive animals in socially relevant contexts, I can investigate how social interaction modulates behavior, problem- solving, and cognitive performance. By studying and comparing models of carnivore and primate foraging, I can better understand how group-living animals modify their actions to meet environmental demands. A primary interest is determining whether similar factors, related to having a complex social organization, influence learning and performance across taxonomic groups. I am also interested in how animals learn rules of social conduct and maintain social cohesion, as evidenced by their patterns of behavioral developmental, the intricate balance between aggression and play, the expression of scent marking, and the social facilitation or inhibition of behavior.
delBarco-Trillo, Javier, et al. “Eulemur, me lemur: the evolution of scent-signal complexity in a primate clade..” Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, vol. 367, no. 1597, July 2012, pp. 1909–22. Epmc, doi:10.1098/rstb.2011.0225. Full Text
Hammond, Geoffrey L., et al. “Phylogenetic comparisons implicate sex hormone-binding globulin in "masculinization" of the female spotted hyena (Crocuta crocuta)..” Endocrinology, vol. 153, no. 3, Mar. 2012, pp. 1435–43. Epmc, doi:10.1210/en.2011-1837. Full Text
MacLean, Evan L., et al. “How does cognition evolve? Phylogenetic comparative psychology..” Anim Cogn, vol. 15, no. 2, Mar. 2012, pp. 223–38. Pubmed, doi:10.1007/s10071-011-0448-8. Full Text Open Access Copy
Rushmore, Julie, et al. “Sight or scent: lemur sensory reliance in detecting food quality varies with feeding ecology..” Plos One, vol. 7, no. 8, Jan. 2012. Epmc, doi:10.1371/journal.pone.0041558. Full Text
Charpentier, M. J. E., et al. “Nasopalatine ducts and flehmen behavior in the mandrill (Mandrillus sphinx): Reevaluating olfactory communication in primates..” American Journal of Primatology, 2012.
Drea, Christine M. “Endocrine correlates of pregnancy in the ring-tailed lemur (Lemur catta): implications for the masculinization of daughters..” Hormones and Behavior, vol. 59, no. 4, Apr. 2011, pp. 417–27. Epmc, doi:10.1016/j.yhbeh.2010.09.011. Full Text
Place, Ned J., et al. “The anti-androgen combination, flutamide plus finasteride, paradoxically suppressed LH and androgen concentrations in pregnant spotted hyenas, but not in males..” General and Comparative Endocrinology, vol. 170, no. 3, Feb. 2011, pp. 455–59. Epmc, doi:10.1016/j.ygcen.2010.10.016. Full Text
Delbarco-Trillo, J., et al. “Night and day: the comparative study of strepsirrhine primates reveals socioecological and phylogenetic patterns in olfactory signals..” Journal of Evolutionary Biology, vol. 24, no. 1, Jan. 2011, pp. 82–98. Epmc, doi:10.1111/j.1420-9101.2010.02145.x. Full Text
Crawford, Jeremy Chase, et al. “Smelling wrong: hormonal contraception in lemurs alters critical female odour cues..” Proceedings. Biological Sciences, vol. 278, no. 1702, Jan. 2011, pp. 122–30. Epmc, doi:10.1098/rspb.2010.1203. Full Text
Boulet, M., et al. “Honest olfactory ornamentation in a female-dominant primate..” Journal of Evolutionary Biology, vol. 23, no. 7, July 2010, pp. 1558–63. Epmc, doi:10.1111/j.1420-9101.2010.02007.x. Full Text