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Mating with relatives leads to inbred offspring, which are likely to experience reduced fitness owing to the expression of deleterious recessive alleles. Constraints in social mate choice do not always allow individuals to avoid pairing with kin. A possible means of inbreeding avoidance is to engage in extrapair copulations with unrelated extrapair individuals. In a population of great tits, Parus...
Abstract. To quantify the success rates of defenders and intruders at a guarded resource and to examine how competitive tactics vary in relation to the number of potential intruders, individual giant danio fish,Danio aequipinnatus, were observed defending a concentrated, renewing food source from 1-20 smaller zebrafish,Danio(=Brachydanio)rerio. With increasing zebrafish numbers, the foraging success...
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