Summary
In a group of captive chimpanzees (Pan troglodytes), we studied whether females received more social benefits from males when they were in oestrus than at other times and whether males distributed their beneficial acts especially to females with whom they mated more frequently. When in oestrus, females were groomed more frequently by males than at other times. There was an indication that females were groomed especially by those males with whom they mated more often. From the male point of view, the relationship between active grooming and copulation frequency held only in interactions with oestrous females. No difference was found in the male's tendency to share food with females in oestrous or anoestrous condition. Further, clear disadvantages were associated with being in oestrus: females received support from males less frequently and were more often involved in conflicts with males than in their anoestrous period. Higher ranking males did not mate more often. No relationship was found between the frequency with which a male copulated with a given female and her dominance rank, age or parity, nor did he support her or share food more often with her.
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Hemelrijk, C.K., van Laere, G.J. & van Hooff, J.A. Sexual exchange relationships in captive chimpanzees?. Behav Ecol Sociobiol 30, 269–275 (1992). https://doi.org/10.1007/BF00166712
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DOI: https://doi.org/10.1007/BF00166712