Article
The influence of bipedalism on the energy and water budgets of early hominids

https://doi.org/10.1016/0047-2484(91)90003-EGet rights and content

A model is described for estimating the net thermal loads, and associated demands for drinking water, experienced by bipedal and quadrupedal hominids in open equatorial environments. Comparisons of the results obtained with the thermoregulatory capabilities of living primates indicate that the equatorial African savannah would have been a difficult habitat for hominoids to exploit. However, under all temperature regimes examined distinct advantages would have been conferred by bipedalism, allowing hominids to forage at higher temperatures and over greater distances, while consuming less food and water, than quadrupeds.

References (64)

  • BakerM.A. et al.

    The influence of the nasal mucosa and the carotid rete upon hypothalamic temperature in sheep

    J. Physiol.

    (1968)
  • BirkebakR.C.

    Heat transfer in biological systems

    Int. Rev. Gen. Exp. Zool.

    (1967)
  • BlaxterK.L.
  • CabanacM.

    Keeping a cool head

    News Physiol. Sci.

    (1986)
  • CampbellG.S.
  • CaputaM.

    Selective brain cooling, an important component of thermal physiology

  • CenaK.

    Radiative heat loss from animals and man

  • DanielP.M. et al.

    Studies on the carotid rete and its associated arteries

    Phil. Trans. R. Soc. B

    (1953)
  • EdneyE.B. et al.

    Water balance and excretion

  • ElizondoR.S.

    Primate models to study eccrine sweating

    Am. J. Primat.

    (1988)
  • FoleyR.
  • GatesD.M.
  • GatesD.M.

    Spectral distribution of solar radiation at the earth's surface

    Science

    (1966)
  • HewesG.W.

    Food transportation and the origins of bipedalism

    Am. Anthrop.

    (1961)
  • HewesG.W.

    Hominid bipedalism: independent evidence for food-carrying theory

    Science

    (1964)
  • HileyP.G.

    The thermoregulatory responses of the galago (Galago crassicavdatus), the baboon (Papio cynocephalus) and the Chimpanzee (Pan satyrus) to heat stress

    J. Physiol.

    (1976)
  • JohnsonG.S. et al.

    Thermoregulation inMacaca mulatta: a thermal balance study

    J. appl. Physiol: Respirat. Environ. Exercise Physiol.

    (1979)
  • JohansonD.C. et al.

    A systematic assessment of early African hominids

    Science

    (1979)
  • JollyC.

    The seed-eaters: a new model of hominid differentiation based on a baboon analogy

    Man

    (1970)
  • KerslakeD.
  • KleiberM.
  • KolkaM.A. et al.

    Thermoregulation inErythrocebus patas. A thermal balance study

    J. appl. Physiol.

    (1983)
  • Cited by (76)

    • Dehydration and persistence hunting in Homo erectus

      2020, Journal of Human Evolution
      Citation Excerpt :

      These studies took advantage of the tight link between water loss and heat loss and estimated water loss by modeling evaporation from the respiratory tract and skin using a heat exchange model. Heat exchange modeling is a well-established approach in a wide spectrum of research areas including physiology, ecology, thermal comfort, aerospace, textile engineering, meteorology, medicine, and military (Porter and Gates, 1969; Stolwijk, 1971; Kerslake, 1972; Haslam and Parsons, 1988; Malchaire et al., 2001; Fiala et al., 2012; Parsons, 2014), and also human evolution (Austin and Lansing, 1986; Wheeler, 1991a, 1992a, 1992b, 1993; Chaplin et al., 1994; Queiroz do Amaral, 1996; Cross et al., 2008; Ruxton and Wilkinson, 2011a, 2011b; Dávid-Barrett and Dunbar, 2016; Collard and Cross, 2017). We built on this vast body of research and use heat exchange modeling and simulation to estimate water loss during persistence hunting in H. erectus who is considered to have already possessed most traits related to endurance locomotion in the heat (Bramble and Lieberman, 2004; Lieberman et al., 2009; Jablonski, 2012).

    • Body surface area and thermoregulation in giraffes

      2017, Journal of Arid Environments
      Citation Excerpt :

      By having a dolichomorphic shape and pointing their heads towards the sun, giraffes can reduce the proportion of body surface intercepting incident solar radiation to well below the proportion in a “cylindrical” animal. That advantage accrues to other taxa, including ants (Sommer and Wehner, 2012) and snakes (Robinson and Hughes, 1978) active in the Namib Desert sun, in wildebeest (Maloney et al., 2005), and has been considered an advantage of hominin bipedalism allowing invasion of open plains (Wheeler, 1991b). Where large enough refuges are available, giraffe can reduce radiant heat loads better by seeking shade, as they do in Etosha National Park (Kuntsch and Nel, 1990).

    • Shorter arms count: The energetic costs of raw material catchment in a new experimental approach at Sierra de Atapuerca

      2017, Quaternary International
      Citation Excerpt :

      Accordingly, load-carrying could be either part of the initial selective impetus for the emergence of bipedalism (Carvalho et al., 2012), as well as a behaviour that emerged after upright walking had evolved. There are many selective agents proposed to explain the origin of hominin locomotion, as demographic and reproductive constraints (Lovejoy, 1981), thermoregulation (Wheeler, 1999), carrying behaviour (Hewes, 1961; Videan and McGrew, 2002) and energetic considerations (Rodman and McHenry, 1980; Leonard and Robertson, 1995; Foley and Elton, 1998; Sockol et al., 2007) Despite a lack of consensus, our results suggests that these hypotheses are not mutually exclusive. Thus, the considerations argued on the basis of the efficiency of bipedalism agree with the relationship observed here between physical activity and leg length.

    View all citing articles on Scopus
    View full text