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2017 ; 38
(3
): 513-532
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Exaggerated Sexual Swellings and the Probability of Conception in Wild Sanje
Mangabeys (Cercocebus sanjei)
#MMPMID28680189
Fernández D
; Doran-Sheehy D
; Borries C
; Ehardt CL
Int J Primatol
2017[]; 38
(3
): 513-532
PMID28680189
show ga
Females of several catarrhine primate species exhibit exaggerated sexual
swellings that change in size and coloration during the menstrual cycle and, in
some species, gestation. Although their function remains under debate, studies
indicate that swellings may contain information males could use to discern
ovulation and the probability that a cycle will be conceptive. Here we combine
visual ratings of swellings with hormonal data for a group of Sanje mangabeys (18
adult, 3 adolescent females) to determine if their swellings provide reliable
information on female fertility. In all cases where ovulation was detected
(N = 7), it occurred during maximum tumescence, and in 83.3% during the first two
days of the "shiny phase," a period during maximum tumescence when the swelling
was brightest. There were no significant differences in maximum tumescence and
shiny phase duration among cycles of different probability of conception,
although there was a trend toward conceptive cycles exhibiting shorter shiny
phases than nonconceptive ones. Only 25% (N = 4) of postconceptive swellings
developed the shiny phase, and adolescents displayed the longest maximum
tumescence and shiny phases. The conspicuous nature of the shiny phase and the
frequent overlap between its onset and ovulation suggest that its presence serves
as a general signal of ovulation and that the cycle has a high probability of
being conceptive. It also suggests that swellings in some Sanje mangabeys are
more accurate signals of fertility than in other primates.