We develop an agent-based model of foraging behavior based on ecological parameters of the environment and prey characteristics measured in the Mbaracayu Reserve Paraguay. We then compare estimated foraging behavior from our model to the ethnographically observed behavior of Ache hunter–gatherers who inhabit the region and show a close match for daily harvest rates, time allocation, and species composition of prey. The model allows us to explore the implications of social living, cooperative hunting, variation in group size and mobility, under Ache-like ecological conditions. Simulations show that social living decreases daily risk of no food, but cooperative hunting has only a modest effect on mean harvest rates. Analysis demonstrates that bands should contain 7–8 hunters who move nearly every day in order to achieve the best combination of average harvest rates and low probability of no meat in camp.
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Alvard, M. S. (1993). Testing the “Ecologically Noble Savage” Hypothesis: Interspecific Prey Choice by Piro Hunters of Amazonian Peru. Human Ecology 21(4): 355–387.
Alvard, M. (2012). In Mitani, J., Call, J., Kappeler, P., Palombit, R., Silk, J., Mitani, J., Call, J., Kappeler, P., Palombit, R., and Silk, J. (eds.), Human Sociality. The Evolution of Primate Societies. University of Chicago Press, Chicago.
Alvard, M. S., and Nolin, D. (2002). Rousseau’s Whale Hunt? Coordination Among Big-Game Hunters. Current Anthropology 43(4): 533–559.
Bird, D. W., and O’Connell, J. F. (2006). Behavioral Ecology and Archaeology. Journal of Archaeological Research 24: 39–63.
Fitzgerald, L. A. (1994). The Interplay Between Life History and Environmental Stochasticity: Implications for Management of Exploited Lizard Populations. American Zoologist 34: 371–381.
Hawkes, K., Hill, K., and O’Connell, J. F. (1982). Why Hunters Gather: Optimal Foraging and the Ache of Eastern Paraguay. American Ethnologist 9(2): 379–398.
Hill, K. (1988). Macronutrient Modifications of Optimal Foraging Theory: An Approach Using Indifference Curves Applied to Some Modern Foragers. Human Ecology 16(2): 157–197.
Hill, K. (2002). Altruistic Cooperation During Foraging by the Ache, and the Evolved Human Predisposition to Cooperate. Human Nature 13(1): 105–128.
Hill, K., and Hawkes, K. (1983). In Hames, R., and Vickers, W. (eds.), Neotropical Hunting Among the Ache of Eastern Paraguay. Adaptive Responses of Native Amazonians. Academic, New York, pp. 139–188.
Hill, K., and Kaplan, H. (1988). Tradeoffs in Male and Female Reproductive Strategies Among the Ache: Part 1. Human Reproductive Behaviour: A Darwinian Perspective. Cambridge University Press, Cambridge, pp. 277–289.
Hill, K., and Hurtado, A. M. (1996). Ache Life History: The Ecology and Demography of a Foraging People. Aldine, New York, USA.
Hill, K., and Hurtado, A. M. (2009). Cooperative Breeding in South American Hunter–Gatherers. Proceedings of the Royal Society B: Biological Sciences 276(1674): 3863–3870.
Hill, K., and Kintigh, K. (2009). Can Anthropologists Distinguish Good from Poor Hunters: Implications for Hunting Hypotheses, Sharing Conventions, and Cultural Transmission. Current Anthropology 50(3): 369–377.
Hill, K., Kaplan, H., Hawkes, K., and Hurtado, A. M. (1985). Men’s Time Allocation to Subsistence Work Among the Ache of Eastern Paraguay. Human Ecology 13: 29–47.
Hill, K., Kaplan, H., Hawkes, K., and Hurtado, A. M. (1987). Foraging Decisions Among Ache Hunter–Gatherers: New Data and Implications for Optimal Foraging Models. Ethology and Sociobiology 8(1): 1–36.
Hill, K., Padwe, J., Bejyvagi, C., Bepurangi, A., Jakugi, F., Tykuarangi, R., and Tykuarangi, T. (1997). Impact of Hunting on Large Vertebrates in the Mbaracayu Reserve, Paraguay. Conservation Biology 11(6): 1339–1353.
Hill, K., McMillan, G., and Fariña, R. (2003). Hunting‐Related Changes in Game Encounter Rates from 1994 to 2001 in the Mbaracayu Reserve, Paraguay. Conservation Biology 17(5): 1312–1323.
Hill, K. R., Walker, R. S., Božičević, M., Eder, J., Headland, T., Hewlett, B., Hurtado, A. M., Marlowe, F., Wiessner, P., and Wood, B. (2011). Co-Residence Patterns in Hunter–Gatherer Societies Show Unique Human Social Structure. Science 331(6022): 1286–1289.
Houston, A., Clark, C., McNamara, J., and Mangel, M. (1988). Dynamic Models in Behavioural and Evolutionary Ecology. Nature 332(6159): 20–34.
Hurtado, A., Hawkes, K., Hill, K., and Kaplan, H. (1985). Female Subsistence Strategies Among Ache Hunter–Gatherers of Eastern Paraguay. Human Ecology 13: 1–28.
Kaplan, H., and Hill, K. (1985). Food Sharing Among Ache Foragers: Tests of Explanatory Hypotheses. Current Anthropology 26(2): 223–245.
Kaplan, H., and Hill, K. (1992). In Smith, E. A., and Winterhalder, B. (eds.), Evolutionary Ecology of Food Acquistion. Evolution, Ecology, and Human Behavior. Aldine, Chicago, USA, pp. 167–202.
Kaplan, H., Hill, K., Hawkes, K., and Hurtado, A. M. (1984). Food Sharing Among Ache Hunter–Gatherers of Eastern Paraguay. Current Anthropology 25(1): 113–115.
Kaplan, H., Hill, K., Lancaster, J., and Hurtado, A. M. (2000). A Theory of Human Life History Evolution: Diet, Intelligence, and Longevity. Evolutionary Anthropology Issues News and Reviews 9(4): 156–185.
Kelly, R. L. (2013). The Lifeways of Hunter–Gatherers: The Foraging Spectrum. Cambridge University Press, Cambridge.
Krivan, V., and Eisner, J. (2003). Optimal Foraging and Predator–Prey Dynamics III. Journal of Theoretical Biology 63(4): 269–279.
Marlowe, F. W. (2005). Hunter‐Gatherers and Human Evolution. Evolutionary Anthropology Issues News and Reviews 14(2): 54–67.
McMillan, G. (2001). Ache Residential Grouping and Social Foraging. Ph.D. Dissertation, University of New Mexico.
Naidoo, R., and Hill, K. (2006). Emergence of Indigenous Vegetation Classifications Through Integration of Traditional Ecological Knowledge and Remote Sensing Analyses. Environmental Management 38(3): 377–387.
Railback, S. F., and Grimm, V. (2011). Agent-Based and Individual-Based Modeling: A Practical Introduction. Princeton University Press, Princeton, USA.
Robinson, J. G., and Redford, K. H. (1986). Intrinsic Rate of Natural Increase in Neotropical Forest Mammals: Relationship to Phylogeny and Diet. Oecologia 68(4): 516–520.
Smith, E. A. (1981). In Winterhalder, B., and Smith, E. A. (eds.), The Application of Optimal Foraging Theory to the Analysis of Hunter–Gatherer Group Size. Hunter–Gatherer Foraging Strategies. University of Chicago Press, Chicago, USA, pp. 36–65.
Smith, E. A. (1985). Inuit Foraging Groups: Some Simple Models Incorporating Conflicts of Interest, Relatedness, and Central-Place Sharing. Ethology and Sociobiology 6: 27–47.
Stephens, D., and Krebs, J. R. (1986). Foraging Theory. Princeton University Press, Princeton, USA.
Tomasello, M., Melis, A. P., Tennie, C., Wyman, E., and Herrmann, E. (2012). Two Key Steps in the Evolution of Human Cooperation: The Interdependence Hypothesis. Current Anthropology 53(6): 673–692.
Walker, R. S., and Hill, K. (2003). Modeling Growth and Senescence in Physical Performance Among the Ache of Eastern Paraguay. American Journal of Human Biology 15: 196–208.
Winterhalder, B. (1986). Optimal Foraging: Simulation Studies of Diet Choice in a Stochastic Environment. Journal of Ethnobiology 6: 205–223.
Winterhalder, B., and Smith, E. A. (1981). Hunter–Gatherer Foraging Strategies. University of Chicago Press, Chicago, USA.
Winterhalder, B., Baillargeon, W., Cappelletto, F., Daniel Jr., I. R., and Prescott, C. (1988). The Population Ecology of Hunter–Gatherers and their Prey. Journal of Anthropological Archaeology 7: 289–328.
We thank Magdalena Hurtado for her help in collecting the ethnographic data, Robin Naidoo for providing a digital database of Ache vegetation types, and Benjamin Schoville and Erich Fisher for their assistance transforming our raw spatial data into a useable GIS database. Curtis Marean helped design the scope of analyses and Eric Smith, Curtis Marean and three anonymous reviewers provided extremely valuable comments. Portions of this research were funded by NSF-IPG grant BCS-1138073
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Janssen, M.A., Hill, K. Benefits of Grouping and Cooperative Hunting Among Ache Hunter–Gatherers: Insights from an Agent-Based Foraging Model. Hum Ecol 42, 823–835 (2014). https://doi.org/10.1007/s10745-014-9693-1
- Optimal foraging theory
- Agent-based modeling