Inclusive Fitness

timer Asked: Dec 7th, 2015

Question description

White-browed scrub-wrens (Sericornis frontalis) are small, wren-like birds that breed in coastal areas of Australia. Scrub-wrens sometimes breed in cooperative groups containing one breeding female and two males, called the alpha and beta males. (The males in the group are not related to the breeding female.) In some groups, the alpha and beta males are brothers. In other groups, the two males are not related to each other. The table below shows the average number of nestlings produced for alpha and beta males in both types of groups: 

                            Alpha and Beta brothers                         Alpha and Beta Unrelated 

Alpha Male                  1.8                                                                  1.3 

Beta Male                     0.5                                                                  1.2 

Calculate the the total inclusive fitness of the alpha and beta males in both types of groups

Now consider that beta male nests alone rather than in cooperative group. Using hamilton rule, how many nestilings would the male have to produce in order to benefit from solitary nesting.

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