Abstract Teleost fish exhibit extraordinary cognitive skills that are comparable to those of mammals and birds. Kin recognition based on olfactory visual imprinting requires neuronal circuits were assumed be necessarily dependent the interaction mammalian amygdala, hippocampus, isocortex, latter being a structure teleost lacking. We show teleosts—beyond having hippocampus pallial amygdala homol...

Few studies have critically investigated the genetic composition of wild fish schools. Yet, such investigations may have profound implications for the understanding of social organization and population differentiation in both fundamental and applied research. Using 20 microsatellite loci, we investigated the composition of 53 schools (total n = 211) of adult and subadult migratory brook charr ...

2 1 I will use the term 'living arrangement' or 'coresidential arrangements' interchangeably to refer to the household structure of the elderly. When living with at least one child (or other kin) I will use the term 'coresidence'. Unless otherwise noted, when elderly live with a spouse but no other kin or are unmarried and living with no other kin, I will use the term 'living alone'.

Close inbreeding has often been shown to be extremely harmful because of the fixation of deleterious recessive alleles in inbred offspring (Charlesworth & Charlesworth 1987). As a consequence, inbred offspring often show reduced fitness compared with outbred offspring (inbreeding depression, Charlesworth & Charlesworth 1987). The ability to identify relatives (kin recognition, Hepper 1991) offe...

The context-dependent nature of kin discrimination was examined in larvae of the marbled salamander, Ambystoma opacum. In a graphical analysis, relationships between aggression and social and ecological factors were explored. Increasing relatedness between individuals was predicted to reduce aggressive encounters, except when correlates of fitness (e.g. body size) differed between individuals a...