Unbiased sex ratios among the Barí: An evolutionary interpretation |
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| Authors: | Maria E Zaldívar Roberto Lizarralde Stephen Beckerman |
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| Institution: | (1) Department of Anthropology, The Pennsylvania State University, 16802 University Park, Pennsylvania;(2) Facultad de Ciencias Económicas y Sociales, Instituto de Investigaciones, Universidad Central de Venezuela, Caracas, Venezuela |
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| Abstract: | We examine whether among the Barí sex ratios at birth or later ages deviate from the value of one expected by chance. We find no significant bias toward sons or daughters. We also examine whether the costs and benefits associated with sons and daughters are similar or if one sex is more expensive than the other. We contrast our results with predictions derived from Fisher's and the Trivers-Willard hypotheses on sex ratios. |
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| Keywords: | sex ratios horticulturalists South America demography child mortality |
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