Social stress and dominance

Article Abstract:

Glucocorticoid stress hormones in African wild dogs and dwarf mongooses were measured to examine the relation of stress to rank in the wild. In the wild, dominants initiate aggression to reinforce their social status, especially during mating season, making dominants more susceptible to greater stress than subordinates. In examining stress levels among dwarf mongooses and wild dogs, cortisol levels of the former's urine and fecal corticosterone levels of the latter were measured. Findings show that dominant dwarf mongooses and wild dogs face greater social stress than their subordinates.

Psychological aspects, Research, Physiological aspects, Stress (Psychology), Social hierarchy in animals, Dominance (Animal behavior)

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Pregnancy, oestrogens and future reproductive success in Serengeti dwarf mongooses

Article Abstract:

The baseline concentration of estrogen increases after pregnancy in free-living dwarf subordinate mongooses. Pregnancy among dwarf subordinates is preferred even if offspring are produced. A study of 13 dominant female mongooses revealed that the reproductive rate of multiparous first-year dominants is better than that of primiparous, since estrogen their level is higher in comparison to primiparous first-year dominants. The difference in reproductive success is positively associated with age. Estrogen level decreases in non-pregnant females during the mating season.

Sexual behavior

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Communal hunting and pack size in African wild dogs, Lycaon pictus

Article Abstract:

A study of the effect of communal hunting on pack size shows that communal hunting increases sociability among African wild dogs in the Selous. An increase in the number of adults in a pack increases the size and number of prey killed, while reducing the chase distance. It has not been ascertained if the increase in size and number of the prey is a benefit or necessity of large packs.

Behavior, Observations, Predation (Biology)

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