Among vertebrate classes, fishes exhibit by far the greatest variability in competitive and
cooperative behaviors in male reproduction. Scramble competition between reproductive …

▪ Abstract Reproductive-skew theory can be broadly divided into transactional models, in
which reproduction is shared among group members in return for some fitness benefit, and …

“Limited control” models of reproductive skew in cooperative societies suggest that the
frequency of breeding by subordinates is determined by the outcome of power struggles with …

Neolamprologus pulcher, a cooperatively breeding cichlid fish from Lake Tanganyika, lives
in permanent social groups comprising one breeding pair and helpers of both sexes …

Because most cooperative societies are despotic, it has been difficult to test models of
egalitarianism. Female African lions demonstrate a unique form of plural breeding in which …

To exploit ecological niches where constraints have favoured selection for group living and
cooperation, both vertebrates and invertebrates have evolved elaborate social systems. In …

The mode by which individuals disperse, and the cost of dispersal, are of great importance
in attempts to understand variation in reproductive skew in animal societies. In this paper we …

The banded mongoose, Mungos mungo, is a social species that forms multimale and
multifemale family groups. Earlier studies suggest these family groups are relatively …

Social groups of acorn woodpeckers (Melanerpesformicivorus) range in size from unaided
pairs to 15 adults. Behavioural indicators of mate guarding, assumed incest avoidance and …

We examined social influences on age at first reproduction in female members of 240 litters
of Mongolian gerbils, Meriones unguiculatus. The results indicated that:(1) sisters inhibit one …