Publications

  • Ross, C, & M Borgerhoff Mulder and others (2018). Greater wealth inequality, less polygyny: Rethinking the polygyny threshold model. Journal of Royal Society Interface. Vol. 15(144), 20180035 DOI:10.1098/r. Published, 07/2018.
  • Kramer, KL & A Veile (2018). Infant allocare in traditional societies. Physiology and Behavior. Vol. 193(A), 117-126. Published, 02/28/2018.
    http://communications.elsevier.com/r/?id=h68fcebc8...
  • Kramer, KL (2018). The cooperative economy of food. Implications for human life history and physiology. Physiology and Behavior. Vol. 193, 196-204. Published, 02/01/2018.
    http://communications.elsevier.com/r/?id=h6d19d6b7...
  • Urlacher, SS & KL Kramer (2018). Evidence for energetic tradeoffs between physical activity and childhood growth across the nutritional transition. Scientific Reports DOI:10.1038/s41598-017-18738-41/10/2018. Vol. 8:369, 1-10. Published, 01/10/2018.
  • Veile, A & KL Kramer (2018). Shifting weanling’s optimum: breastfeeding ecology and infant health in Yucatan. In Breastfeeding New Anthropological Approaches . (pp. 170-184). Routledge Press, London. Published, 01/01/2018.
  • Schacht, R, KL Kramer, T Szekely and P Kappeler, eds (2017) Adult Sex Ratios and Reproductive Strategies: A Critical Re-examination of Sex Differences in Human and Animal societies. Philosophical Transactions, B 372 (1729) ISSN 0962-8436. Published, 07/2017.
  • Kramer, KL, R Schacht & A Bell (2017) Adult sex ratios & partner scarcity among hunter-gatherers: implications for dispersal patterns and the evolution of human sociality. Philosophical Transactions of the Royal Society, B 372 20160316 http://dx.doi.org/10.1098/rstb.2016.0316. Published, 07/2017.
  • Schacht, R, KL Kramer, T Székely & P Kappeler (2017) Adult sex ratios and reproductive decisions: a critical reexamination of sex differences in human and animal societies. Philosophical Transactions, B 372 20160309 http://dx.doi.org/10.1098/rstb.2016.0309. Published, 07/2017.
  • AV Jaeggi*, KL Kramer*, R Hames*, EJ Kiely, C Gomes, H Kaplan & M Gurven (2017) Human grooming in comparative perspective: People in six small-scale societies groom less but socialize just as much as expected for a typical primate. American Journal of Physical Anthropology DOI: 10.1002/ajpa.23164. * authors contributed equally to this work. Published, 01/18/2017.
  • Veile, A & KL Kramer (2016) Childhood body size is positively associated with cesarean birth in Yucatec Maya subsistence farmers. American Journal of Human Biology, Oct 4, 2016. DOI: 10.1002/ajhb.22920. Published, 10/04/2016.
  • Lancelotti, C, D Zurro, NJ Whitehouse, KL Kramer, M Madella, JJ García-Granero, RD Greaves (2016) Resilience of small-scale societies’ livelihoods: a framework for studying the transition from food gathering to food production. Ecology & Society 21(4):8. DOI: http://dx.doi.org /10.5751/ES-08757-210408. Published, 10/2016.
  • Schacht, R & KL Kramer (2016) Patterns of family formation in response to sex ratio. PLoS ONE 11(8): e0160320. doi:10.1371/journal.pone.0160320. Published, 08/24/2016.
    http://journals.plos.org/plosone/article?id=10.137...
  • Codding, BF & KL Kramer, eds (2016) Why Forage? Hunters and Gatherers Living in the 21st Century. School of Advanced Research, Santa Fe. https://unmpress.com/books.php?ID=20000000007067. Published, 05/31/2016.
  • Kramer, KL & B Codding (2016) Hunter-Gatherers in the 21st century. In Why Forage? Hunters and Gatherers Living in the 21st Century, B Codding & KL Kramer (eds). School of Advanced Research & UNM Press, Albuquerque. Published, 05/01/2016.
  • Kramer, KL & RD Greaves (2016) Diversity or Replace. What happens to wild foods when cultigens are introduced into hunter-gatherer diets. In Why Forage? Hunters and Gatherers Living in the 21st Century, B Codding & KL Kramer (eds). School of Advanced Research & UNM Press, Albuquerque. Published, 05/01/2016.
  • Kramer, KL, A Veile & E Otárola-Castillo (2016) Sibling competition, growth tradeoffs. Biological vs. statistical significance. PLoS ONE 11(3): e0150126. doi:10.1371/journal.pone.0150126. Published, 03/03/2016.
    http://journals.plos.org/plosone/article?id=10.137...
  • E Cashdan, Kramer, KL, HE Davis, RD Greaves & L Padilla (2016) Mobility and navigation among the Yucatec Maya. Sex differences reflect parental investment, not mating competition. Human Nature 27:35-50. Published, 01/2016.
    http://link.springer.com/article/10.1007%2Fs12110-...
  • Blake, PR, K McAuliffe, T Callaghan, J Corbit, O Barry, A Bowie, L Kleutsch, KL Kramer, E Ross, H Vongsachang, R Wrangham, & F Warneken (2015) The ontogeny of fairness in seven cultures cultures. Nature 528:258-261. Published, 10/01/2015.
  • Kramer, KL & E Otárola-Castillo (2015) When mothers need others. Life history transitions associated with the evolution of cooperative breeding. Journal of Human Evolution 84:16-24. Published, 05/2015.
    http://www.sciencedirect.com/science/article/pii/S...
  • Kramer, KL & AF Russell (2015) Was monogamy a key step on the hominin road? Reevaluation of the Monogamy Hypothesis. Evolutionary Anthropology 24:73-83. Published, 03/2015.
    http://onlinelibrary.wiley.com/doi/10.1002/evan.21...
  • Kramer, KL (2015) Cooperative breeding & human evolution. In Emerging Trends in the Social and Behavioral Sciences, RA Scott & SM Kosslyn (eds). John Wiley and Sons, Hoboken, NJ. DOI:10.1002/9781118900772.etrds0055. Published, 01/01/2015.
    http://onlinelibrary.wiley.com/doi/10.1002/9781118...
  • Kramer, KL and AF Russell (2014) Kin-selected cooperation without lifetime monogamy: human insights and animal implications. Trends in Ecology & Evolution 29(11):600-606. Published, 11/01/2014.
    http://www.sciencedirect.com/science/article/pii/S...
  • Greaves, RD and KL Kramer (2013) Hunter-gatherer use of wild plants and domesticates: archaeological implications for mixed economies before agricultural intensification. Journal of Archaeological Science 41:263-271. Published, 09/2013.
    http://www.sciencedirect.com/science/article/pii/S...
  • Kramer, KL (2014) Why what juveniles do matters in the evolution of cooperative breeding. Human Nature, special edition on eusociality, 25(1):49-65. Published, 06/2013.
    http://link.springer.com/article/10.1007/s12110-01...
  • Veile, A, J Winking, RD Greaves, M Gurven & KL Kramer (2012) Infant growth and the thymus: data from two South American native societies. American Journal of Human Biology 24(6):768-775. Published, 01/2012.
    http://onlinelibrary.wiley.com/doi/10.1002/ajhb.22...
  • Kramer, KL (2011) The evolution of human parental care and recruitment of juvenile help. Trends in Ecology and Evolution 26(10):533-540. Published, 10/2011.
    http://ac.els-cdn.com/S0169534711001650/1-s2.0-S01...
  • Kramer, KL & PT Ellison (2010) Pooled energy budgets: Resituating human energy allocation tradeoffs. Evolutionary Anthropology 19:136-147. Published, 10/2010.
    http://onlinelibrary.wiley.com/doi/10.1002/evan.20...
  • Kramer, KL (2010) Cooperative breeding and its significance to the demographic success of humans. Annual Review of Anthropology 39:414-436. Published, 10/2010.
    http://www.annualreviews.org/doi/abs/10.1146/annur...
  • Kramer, KL & JB Lancaster (2010) Teen motherhood in cross-cultural perspective. Annals of Human Biology 37(5):613-628. Published, 10/2010.
    http://www.tandfonline.com/doi/abs/10.3109/0301446...
  • Kramer, KL, RD Greaves & PT Ellison (2009) Early reproductive maturity among Pumé foragers. Implications of a pooled energy model to fast life histories. American Journal of Human Biology 21(4): 430-437. Published, 10/2009.
    http://www.fas.harvard.edu/~bioanth/pdf/AJHB_2009....
  • Kramer, KL (2008) Early sexual maturity among Pumé foragers of Venezuela: Fitness implications of teen motherhood. American Journal of Physical Anthropology 136 (3): 338-350. Published, 05/2008.
    http://onlinelibrary.wiley.com/doi/10.1002/ajpa.20...
  • Kramer, KL (2005) Maya Children: Helpers at the Farm. Harvard University Press, Cambridge. Published, 05/2005.
    https://books.google.com/books?hl=en&lr=&id=-qMlJO...

Research Keywords

  • life history, cooperation, cooperative breeding, evolution of childhood, behavioral ecology, hunter-gatherers

Presentations

  • Hunter-Gatherers in the 21st Century. Economic and Social Dimensions of Foraging in a Changing Landscape. Session Chair (co-organizer Alyssa Crittenden). Society for Cross Cultural Research. Panel, Presented, 02/23/2018.
  • Why Savanna Pumé Foragers Retain a Hunting and Gathering Way of Life. Society for Cross-Cultural Research, Las Vegas. Conference Paper, Presented, 02/22/2018.
  • Causes and Consequences of Cesarean Birth in Yucatec Maya Subsistence Farmers, (1st author S Tuller). American Association of Physical Anthropologists, Austin (scheduled). Conference Paper, Accepted, 02/17/2018.
  • Demonstrating Growth & Family Size Tradeoffs. Statistical vs Biological Significance. American Association of Physical Anthropologists, Austin (scheduled). Conference Paper, Accepted, 02/17/2018.
  • Birth across the Epidemiological Transition: Implications for Infant Growth and Gut Microbiome Assembly, (1st author A Veile). American Association of Physical Anthropologists, Austin (scheduled). Conference Paper, Accepted, 02/17/2018.
  • Chimpanzees are Fatter than You Think: Differences in Regional Body Fat Deposition between Hunter-Gatherers and Captive Chimpanzees, (1st author A Achenbach). Association of Physical Anthropologists, Austin (scheduled). Poster, Accepted, 02/17/2018.
  • Adult Sex Ratios and Partner Scarcity among Hunter-Gatherers: Implications for the Evolution of Dispersal Norms in Small Populations. American Anthropological Association, Washington D.C. Conference Paper, Presented, 11/30/2017.
  • Fertility Variance Not Decline Characterizes the Early Demographic Transition. Population Association Of American, Denver (scheduled). Conference Paper, Accepted, 11/27/2017.
  • The Cooperative Economy of food in Traditional Societies: Its Effect on Human Life History & Physiology. IBRC, Purdue University. Invited Talk/Keynote, Presented, 10/03/2017.
  • Mating Competition, Mobility, and Wayfinding: A Comparison of Three Societies, (1st author E Cashdan). HBES, Boise. Conference Paper, Presented, 07/01/2017.
  • Too Many Men? Too Many Women? Effects of Sex-Ratio Imbalance on Marriage and Family Formation, (1st author R Schacht). Population Association of America, Chicago. Conference Paper, Presented, 04/28/2017.
  • Child Physical Activity during the Economic Transition among Small-Scale Populations, (1st author SS Urlacher). Population Association of America, Chicago. Conference Paper, Presented, 04/28/2017.
  • Objectively Measured Childhood Physical Activity among Small-Scale Populations, (1st author SS Urlacher). American Association of Physical Anthropologists, New Orleans. Conference Paper, Presented, 04/21/2017.
  • Sex Ratio Imbalance Affects Marriage and Reproductive Decisions among Pumé Hunter-Gatherers. American Association of Physical Anthropologists, New Orleans. Conference Paper, Presented, 04/20/2017.
  • Seasonal Fluctuation in Body Fat Sexual Dimorphism among Pumé Hunter-Gatherers, (1st author A Achenbach). American Association of Physical Anthropologists, New Orleans. Poster, Presented, 04/20/2017.
  • Cesarean Births Modulate Indigenous Children’s Growth in Rural and Urban Settings, (1st author A Veile). Human Biology Association, New Orleans. Conference Paper, Presented, 04/17/2017.
  • Continued Hunter-Gatherer Independence in an Inhospitable Environment and Troubled Economy: Savanna Pumé Foragers of the Venezuelan Llanos, (1st author RD Greaves). Society for Applied Anthropology, Santa Fe. Conference Paper, Presented, 03/21/2017.

Research Groups

  • The Effects of Social Networks on Inequality , Other. 01/01/2017 - 12/31/2017. Awards/Scholarships/Stipends: 0.
  • The Effects of Social Networks on Inequality , Other. Santa Fe Institute. 08/2016 - present.
  • Polygyny Paradox Project , Other. 01/2014 - present.
  • Dynamics of Wealth Inequality , Other. Santa Fe Institute. 02/01/2012 - present.

Grants, Contracts & Research Gifts

  • Currently funded research: Emerging Differences in Children’s Economic Roles and Parental Investment though the Fertility Transition of Maya Farmers. PI: Kramer. National Science Foundation, 08/01/2010 - present. Total project budget to date: $270,898.00
  • Risk Sensitive Decision Making among Maya Farmers: Subsistence diversification in Response to Novel Environments. PI: KL Kramer. Co-PI(s): R Schacht. National Science Foundation,, 07/01/2016 - 07/01/2019. Total project budget to date: $324,431.00
  • Spatial Reasoning among Maya Children: An Interdisciplinary and Cross-Cultural Study. PI: KL Kramer. University of Utah Interdisciplinary Research Pilot Program , 08/01/2015 - 07/31/2016. Total project budget to date: $10,000.00

Geographical Regions of Interest

  • Americas
    Mexico, South America, Madagascar & Small-scale societies everywhere.