Adult sex ratio as an index for male strategy in primates
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2019
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Abstract
The adult sex ratio (ASR) is defined as the number of fertile males divided
by the number of fertile females in a population. We build an ODE model with
minimal age structure, in which males compete for paternities using either a
multiple-mating or searching-then-guarding strategy, to investigate the value
of ASR as an index for predicting which strategy males will adopt, with a focus
in our investigation on the differences of strategy choice between chimpanzees
Pan troglodytes and human hunter-gatherers Homo sapiens. Parameters in the
model characterise aspects of life history and behaviour, and determine both
dominant strategy and the ASR when the population is at or near equilibrium.
Sensitivity analysis on the model parameters informs us that ASR is strongly
influenced by parameters characterising life history, while dominant strategy
is affected most strongly by the effectiveness of guarding (average length of
time a guarded pair persists, and resistance to paternity theft) and moderately
by some life history traits. For fixed effectiveness of guarding and other
parameters, dominant strategy tends to change from multiple mating to guarding
along a curve that aligns well with a contour of constant ASR, under variation
of parameters such as longevity and age female fertility ends. This confirms
the hypothesis that ASR may be a useful index for predicting the optimal male
mating strategy, provided we have some limited information about ecology and
behaviour.
| Reference Key |
kim2019adult
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|---|---|
| Authors | D. Rose; K. Hawkes; P. S. Kim |
| Journal | arXiv |
| Year | 2019 |
| DOI |
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