Flashcards in special reading - cooperative breeding 2 - helper effort in birds Deck (7)
what are the hypotheses?
cooperative investment should correlate positively with the relatedness of helpers to the recipients of their care as predicted by inclusive fitness
what was the methods?
- tested 36 cooperatively breeding bird species
- developed a measure of helper effort
- excluded species with extra pair paternity from the study - because they were testing relatedness
- determined kinship of broods from published resources
- also reported the sex ratio of helpers
- identified the proportion of breeding pairs helped
- recorded group size
what were the results?
- species-specific helper contributions to cooperative brood care increase as the mean relatedness between helpers and recipients increases
relation of results to hypotheses?
- findings support hypothesis that variation in helping behaviour among cooperatively breeding birds is consistent with Hamilton’s rule
relation of results to general animal behaviour?
- kin selection has a key role in the evolution of cooperative investment in social birds
-gives an explanation for the considerable inter-specific variation in the amount of effort that helpers contribute towards cooperative brood care
what was the aim of the experiment?
comparative analysis to test variation in brood care among species predicted by inclusive fitness theory