Richard Bribiescas

      Richard Gutierrez Bribiescas

Principal Investigator


Deputy Provost

Faculty Development and Diversity

Professor of Anthropology and Ecology & Evolutionary Biology

phone: 203.432.3671



Ph.D. Anthropology, Harvard University 1997

A.M. Anthropology, Harvard University 1994

B.A. Anthropology & Psychology, double major, UCLA 1988




Bribiescas RG (in press) How Men Age: What Evolution Reveals about Male Health and Mortality.  Princeton University Press, Princeton, NJ.




Bribiescas RG (2006) Men: Evolutionary and Life History.  Harvard University Press, Cambridge, MA. Available on Amazon Kindle


Peer Reviewed Articles


Ziomkiewicz A, Frumkin A, Zhang Y, Sancilio A, & Bribiescas RG (in press) Environmental conditions matter for cost of reproduction in females - reproductive effort and oxidative stress in pre- and postmenopausal American women. American Journal of Human Biology.
Jasienska G, Bribiescas RG, Furberg A-S, Helle S, & Núñez-de la Mora A. (2017) Human reproduction and health: An evolutionary perspective. The Lancet. 390:510-20. [doi:10.1016/S0140-6736(17)30573-1]
Amir D, Jordan MR, & Bribiescas RG (2016) A longitudinal assessment of associations between adolescent environment, adversity perception, and economic status on fertility and age of menarche. PLoS One. 11(6): e0155883. [doi:10.1371/journal.pone.0155883]
Urlacher S, Liebert M, Snodgrass J, Blackwell A, Cepon-Robins T, Gildner T, Madimenos F, Amir D, Bribiescas RG, & Sugiyama L. (2016) Heterogeneous effects of market integration on subadult growth and nutritional status among the Amazonian Shuar. Annals of Human Biology. 26:1-25. [Epub ahead of print] [doi:10.1080/03014460.2016.1192219]

Ziomkiewicz A, Sancilio A, Galbarczyk A, Klimek M, Jasienska G, & Bribiescas RG. (2016) Evidence for the cost of reproduction in humans revealed by associations between lifetime reproductive effort and oxidative stress in postmenopausal women. PLoS ONE. 11(1): e0145753. [DOI:10.1371/journal.pone.0145753]

Lambert MR, Giller GSJ, Skelly DK, & Bribiescas RG (2016) Septic systems, but not sanitary sewer lines, are associated with elevated estradiol in frog metamorphs from suburban ponds. General and Comparative Endocrinology. 232: 109-114. [DOI:10.1016/j.ygcen.2016.01.009]

Aronsen GP, Beuerlein M, Watts DP, & Bribiescas RG (2015) Redtail and red colobus monkeys show intersite urinary cortisol level variation in Kibale National Park, Uganda. Conservation Physiology. 3(1):1-6. [doi:10.1093/conphys/cov006]

Amir D, Ellison PT, Hill KR, & Bribiescas RG (2014) Diurnal variation in salivary cortisol across age classes in Ache Amerindian males of Paraguay. American Journal of Human Biology. [doi:10.1002/ajhb.22645]

Rudzik A, Breakey A, & Bribiescas RG. (2014) Oxytocin and Epstein-Barr Virus: Stress biomarkers in the postpartum period among first-time mothers from São Paulo, Brazil. American Journal of Human Biology. 25(1):43-50. [doi:10.1002/ajhb.22489].

Clancy KBH, Klein LD, Ziomkiewicz A, Nenko I, Jasienska G, & Bribiescas RG. (2013) Relationships between biomarkers of inflammation, ovarian steroids, and age at menarche in a rural Polish sample.  American Journal of Human Biology. 25:389–398. [doi:10.1002/ajhb.22386].

Bribiescas RG, Ellison PT, & Gray PB (2012) On the evolution of male life history variability and the emergence of the genus Homo:  New hypotheses and perspectives.Current Anthropology. [doi: 10.1086/667538]

Jaimez NA, Bribiescas RG, Aronsen GP, Anestis SA, & Watts DP. (2012) Urinary cortisol levels of grey cheeked mangabeys are higher in disturbed compared to undisturbed forest areas in Kibale National Park, Uganda. Animal Conservation. 15(3):242-247. [doi: 10.1111/j.1469-1795.2011.00508.x]

Bribiescas RG (2011) An evolutionary and life history perspective on the role of males on human futures. Futures. 43:729-739. [doi:10.1016/j.futures.2011.05.016]

Kamilar JM, Bribiescas RG, & Bradley BJ (2010) Is group size related to longevity in mammals? Biology Letters. 6(6):736-739. [doi:10.1098/rsbl.2010.0348]

Bribiescas RG & Anestis SF (2010) Leptin associations with age, weight, and sex among chimpanzees (Pan troglodytes). Journal of Medical Primatology. 39(5):347-355. [doi: 10.1111/j.1600-0684.2010.00419.x]

Bribiescas RG (2010) An evolutionary and life history perspective on human male reproductive senescence. Annals of the New York Academy of Science. 1204:54-64. [doi: 10.1111/j.1749-6632.2010.05524.x]

Bribiescas RG & Hill K (2010) Circadian variation in salivary testosterone levels across age classes in Ache Amerindian males of Paraguay. American Journal of Human Biology. 22(2):216-20. [doi: 10.1002/ajhb.21012]

Clancy KBH, Ellison PT, Jasienska G, & Bribiescas RG (2009) Endometrial thickness is not independent of luteal phase length in a rural Polish population. Anthropological Sciences. 117(3):157-163. [doi:10.1537/ase.090130]

Anestis SF, Breakey AA, Beuerlein MM, & Bribiescas RG (2009) Specific gravity as an alternative to creatinine for estimating urine concentrations in captive and wild chimpanzees.  American Journal of Primatology. 70:1-6. [doi:10.1002/ajp.20631]

Bribiescas RG, Betancourt J, Torres AM, & Reiches M. (2008) Short report: Active ghrelin levels across time and associations with leptin and anthropometrics in healthy Ache Amerindian women of Paraguay. American Journal of Human Biology. 20(3):352-4. [doi: 10.1002/ajhb.20699]

Uchida A., Bribiescas RG, Kanamori, M, Hirose N, Ando J, Ohno Y, & Ellison PT (2006) Age related variation of salivary testosterone values in healthy Japanese males. Aging Male. 9(4):207-13. [doi:10.1080/13685530601060461]

Bribiescas RG & Hickey MS (2006) Population variation and differences in serum leptin independent of adiposity: A comparison of Ache Amerindian men of Paraguay and lean American male distance runners. Nutrition and Metabolism. 3(34). [doi:10.1186/1743-7075-3-34]

Bribiescas RG (2006) On the evolution, life history, and proximate mechanisms of human male reproductive senescence.  Evolutionary Anthropology. 15(4):132-141. [doi: 10.1002/evan.20087]

Anestis S., Bribiescas RG & Hasselschwert DL (2006) Age, rank, and personality effects on the cortisol sedation stress response in young chimpanzees. Physiology and Behavior. 89(2):287-294. [doi:10.1016/j.physbeh.2006.06.010]

Muehlenbein M. & Bribiescas RG (2005) Testosterone-mediated immune function and male life histories. American Journal of Human Biology.17(5)527-58. [doi:10.1002/ajhb.20419] (Featured cover article)

Bribiescas RG (2005) Age related differences in serum gonadotropin (FSH & LH), salivary testosterone, and 17-ß estradiol levels among Ache Amerindian males of Paraguay.American Journal of Physical Anthropology.127:114-21.

Bribiescas RG (2005) Short report:  Serum leptin levels in Ache Amerindian females with normal adiposity are not significantly different from American anorexia nervosa patients. American Journal of Human Biology. 17(2): 207-10. [doi:10.1002/ajhb.20108]

Anestis SF & Bribiescas RG (2004) Rapid changes in chimpanzee (Pan troglodytes) urinary cortisol. Hormones and Behavior. 45(3):209-13. [doi: 10.1016/j.yhbeh.2003.09.015]

Bribiescas RG (2003) Effects of oral zinc supplementation on serum leptin levels in Ache males of eastern Paraguay. American Journal of Human Biology. 15:681-7. [doi: 10.1002/ajhb.10199]

Ellison PT, Bribiescas RG, Bentley GR, Campbell BC, Lipson SF, Panter-Brick C, Hill K (2002) Population variation in age-related decline in male salivary testosterone. Human Reproduction. 17(12):3251-3253. [doi: 10.1093/humrep/17.12.3251]

Bribiescas RG (2001) Reproductive ecology and life history of the human male. Yearbook of Physical Anthropology. 116(S33): 148-176. [doi: 10.1002/ajpa.10025]

Bribiescas RG (2001) Serum leptin levels and anthropometric correlates in Ache Amerindians of eastern Paraguay. American Journal of Physical Anthropology. 115(4): 297-303. [doi:10.1002/ajpa.1085]

Bribiescas RG (1998) Dominance and testosterone in men: Incorporating interpopulational variation and male energetics. Behavioral and Brain Sciences. 21(2): 364-5.

Bribiescas RG (1997) Testosterone as a proximate determinant of somatic energy allocation in human males: Evidence from Ache men of eastern Paraguay. Ph.D. dissertation, Harvard University, Department of Anthropology.

Bribiescas RG (1996) Testosterone levels among Ache hunter/gatherer men: A functional interpretation of population variation among adult males. Human Nature. 7(2):163-88. [doi: 10.1007/BF02692109]


Edited Book Chapters

Bribiescas RG & Burke EE. in press. Health, Evolution, and Reproductive Strategies in Men:  New Hypotheses and Directions.  In: Evolution and Health over the Life Course. Holmes DJ, Jasienska G, and Sherry D., eds. Springer. Berlin.

Bribiescas RG & Muehlenbein M (2010) Evolutionary endocrinology. p. 127-143.  In.Human Evolutionary Biology, Muehlenbein, M. ed. Cambridge University Press.

Muehlenbein M & Bribiescas RG (2010) Male reproduction: physiology, behavior and ecology. p. 351-376.  In. Human Evolutionary Biology, Muehlenbein, M. ed. Cambridge University Press.

Bribiescas RG & Ellison PT (2007) How hormones mediate tradeoffs in human health and disease.  In. Evolution in Health and Disease, S. Stearns, ed. Oxford University Press, Oxford.

Bribiescas RG (2006) Reproductive physiology and human evolution.  p. 127-137. In:Integrative Approaches to Human Health and Evolution, Bromage, T., Ochoa, A., & Vidal, A., eds. Elsevier Press.

Bribiescas RG (2003) Paraguay: A health assessment in cultural context.  In: Pocket Guide Series to Cultural Health Assessment, D’Avanzo C, ed., Mosby Press, St. Louis, MO ----revised (2006)

Bribiescas RG (2001) Reproductive physiology of the human male: An evolutionary and life history perspective. p. 107-135. In: Reproductive Ecology and Human Evolution. Ellison PT, ed. Aldine de Gruyter, New York.


Book Reviews

Mai, LL, Young Owl, M, & Kersting, MP (2006) The Cambridge Dictionary of Human Biology and Evolution.  Cambridge University Press, Cambridge.  Journal of Mammalian Evolution 13(2)167.

Mayr, E (2005) What makes biology unique?  Considerations on the Autonomy of a Scientific Discipline.  Cambridge University Press, Cambridge.  Journal of Mammalian Evolution. 12(3-4) 517-520.



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