Competition among females

Article Abstract:

The sexual behavior of female Prunella collaris commonly known as alpine accentors is investigated. Female accentors belonging to a polygynandrous group have hierarchal organization based on age. The more dominant females get to mate more frequently and with more males from the group. Male accentors contribute to the care of nestlings belonging to females with whom they mated thus more dominant females enjoy more paternal contributions from the males of the group. This ensure higher reproductive success for dominant females.

Sexual behavior in animals, Animal sexual behavior

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Male aerial display and reversed sexual size dimorphism in the dunlin

Article Abstract:

Research focusing on the dunlin, Calidris alpina, has confirmed the view that sexual selection in males favours aerial agility in species with male display flights. This is why males are smaller than females in these species. The main elements of the aerial display hypothesis for the evolution of reversed dimorphism in waders may also be relevant for some other animals, including swarming insects. However, the aerial display hypothesis does not apply to all species with male display flights.

Dimorphism (Animals), Dimorphism (Biology)

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