Evidence for dominant wild female chimpanzees investing more in sons

Article Abstract:

A 15 year study was conducted on the parental resource investment of the female wild chimpanzee Pan troglodytes. Subdominant female chimpanzees were found to invest 11 months more on female offsprings while dominant females invested two years more on male offsprings. The behavior of dominant female chimpanzees is attributed to the higher survival rate of their sons. Maternal condition and differences in female-biased dispersal pattern cause the variations in resource investment among other chimpanzee populations.

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Tactical use of unimodal and bimodal communication by chimpanzees, Pan troglodytes

Article Abstract:

Tailoring of communication by the chimpanzees in accordance with the attentional status of a human observer is determined by presenting 57 chimpanzees with three experimental conditions in randomized order. It was determined that the chimpanzees behavior was mostly visual or bimodal in the Focal condition, changing to auditory behavior or disengagement in the In-Cage and Adjacent conditions.

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Context-specific calls in wild chimpanzees, Pan troglodytes versus: analysis of barks

Article Abstract:

Analysis of whether the barks of wild male chimpanzees in the Tai Forest, Cote d'Ivoire, are context specific is done as context-specific calls are selectively produced in specific contexts. The acoustic structure of barks, and other calls produced in association with barks in six contexts is examined using discriminant function analysis.

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