Balancing costs and opportunities: dispersal in male baboons

Article Abstract:

Studies on the migration and residence pattern of 110 baboons indicate the effect of population density, mating chances and risk of predation on the dispersal tendency. The high mortality of offspring whose natal males and fathers are the same implies the effect of breeding within the natal group. The extent of reproductive activity among most of the males before natal dispersal is average to extreme. Natal dispersal occurs at an average age of 8.5 yr and the duration of remaining in nonnatal groups is 24 months.

Reproduction (Biology), Baboons, Reproduction

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Sex allocation and colony maintenance in monogyne and polygyne colonies of Formica truncorum (Hymenoptera: Formicidae): the impact of kinship and mating structure

Article Abstract:

The worker ants control sex allocation as well as reproductive allocation. Colony productivity and differential dispersal of the sexes are prominent in the polygyne colonies with worker-queen conflict being a minor factor whereas in the monogyne colonies sex allocation and reproductive allocation are decided by kin structure and worker-queen conflict. The population-level sex ratio is male biased in polygyne population and female biased in the monogynes.

Sexual behavior, Behavior, Insects, Ants

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Rapid change in offspring sex ratios after clan fission in the spotted hyena

Article Abstract:

A fission in a clan of Crocuta crocuta, the spotted hyena, leads to a variation in the ratio of sexes in juveniles due to an alteration of sex bias in cubs recruited through births. The number of females increases after fission, when the size of the clan is less than the habitat's carrying capacity. The cooperation among the philopatric individuals and competition for resources influence the secondary sex ratios.

Hyenas

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