Neolamprologus pulcher, a cooperatively breeding cichlid fish from Lake Tanganyika, lives in permanent social groups comprising one breeding pair and helpers of both sexes. Variation in group size… (More)
'Helping' in birds and mammals involves seemingly altruistic behaviour. In the cichlid fish LamproIogus birchardi helpers are usually young of former broods staying in their parents' territories and… (More)
Several hypotheses aim to explain the evolution of helping behavior, but conclusive experimental support for evaluating the relative importance of individual hypotheses is still larking We report on… (More)
Field data show that in the cichlid fish Lamprologus brichardi conspecifics other than the reproducing pair help in brood care and territory maintenance. The expected degree of relatedness between… (More)
Environmental conditions are thought to be responsible for the extent and benefits of cooperative breeding in many animal societies, but experimental tests are scarce. We manipulated predator… (More)
Genetic techniques and long-term behavioural observations were combined to investigate dispersal patterns and changes in social position in Neolamprologus pulcher, a co-operatively breeding cichlid… (More)
Petra Dierkes, Dik Heg,* Michael Taborsky, Eva Skubic and Roland Achmann Konrad Lorenz Institute for Comparative Ethology, Austrian Academy of Sciences, Vienna, Austria Department of Behavioural… (More)
Nous avons mis en tvidence les interactions qui s’ttablissent B longue distance, par des chants en duo, entre douze groupes familiaux de Gibbons (Hylobates lar), en Thai’lande. Les analyses… (More)
Reproductive parasitism among males is prevalent in fishes. Typically, small ripe males parasitize the reproductive effort of large bourgeois males by using various behavioural tactics. We examined… (More)
The existence of 'animal personality', i.e. consistent individual differences in behaviour across time and contexts, is an evolutionary puzzle that has recently generated considerable research… (More)