special reading - cooperative breeding 2 - helper effort in birds Flashcards Preview

Animal behaviour - year 2 > special reading - cooperative breeding 2 - helper effort in birds > Flashcards

Flashcards in special reading - cooperative breeding 2 - helper effort in birds Deck (7)
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1

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

2

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

3

what were the results?

- species-specific helper contributions to cooperative brood care increase as the mean relatedness between helpers and recipients increases

4

relation of results to hypotheses?

- findings support hypothesis that variation in helping behaviour among cooperatively breeding birds is consistent with Hamilton’s rule

5

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

6

what was the aim of the experiment?

comparative analysis to test variation in brood care among species predicted by inclusive fitness theory

7

problems with the experiment?

didn’t investigate direct fitness benefits which could have contributed

Decks in Animal behaviour - year 2 Class (25):