IUCN / SSC Cat Specialist Group - Digital Cat Library |
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| Packer, C.; Pusey, A.E. | |
| Intrasexual cooperation and the sex ratio in African lions | |
| 1987 American Naturalist (130): 636-642 | |
In spatially structured populations, sex ratios are expected to deviate from equality to favor the more productive sex. Most sex-ratio models emphasize the diminishing returns of producing more of one sex than of the other through the effects of local mate competition or local resource competition. Production of one sex may be favoured, however, when there is local resource enhancement through cooperation by individuals of that sex. Although there is considerable empirical evidence that local mate competition leads to female-biased sex ratios in Hymenoptera, there is much less evidence that reproductive enhancement affects the sex ratio. We show here that African lions bias their sex ratios in favor of males when those males enhance each other's expected reproductive success. |
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