Abstract
Cascades frog ( Rana cascadae) tadpoles preferentially associate with full siblings over half sibling and half siblings over non-siblings when reared with siblings or as isolates. These tadpoles can use cues of maternal or paternal origin in distinguishing siblings from non-siblings, but maternal cues are preferred over paternal cues. This suggests that a hierarchy of cue importance may exist. Our results are consistent with both a phenotypic matching and a genetic recognition system of kin recognition. Thus, both learned and innate components may play a role in R. cascadae sibling recognition. Kin recognition may facilitate preferential treatment of kin, such as cooperation in food finding or in warning against predators, and therefore those individuals behaving altruistically in kin groups can increase their inclusive fitness.
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