Wild guppies from populations exposed to higher predation risk exhibit greater vasotocin brain gene expression

Intraspecific variation in social behaviour is often observed among animal populations. Local predation risk can be a key driver of these differences, with populations that are exposed to greater threat typically showing greater aggregation and reduced intraspecific aggression. The Trinidadian guppy, Poecilia reticulata , is found in populations that vary dramatically in predation risk and show greater grouping and reduced agonism in...