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Fine-scale genetic structuring on Manacus manacus leks.

L Shorey¹, S Piertney, J Stone

¹Population Biology/EBC, Uppsala University, Sweden. lisa.shorey@ebc.uu.se

|December 1, 2000

Summary

This summary is machine-generated.

Males may join leks not just to compete, but to help relatives reproduce. This study shows kin selection drives lek formation in white-bearded manakins, boosting inclusive fitness.

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Area of Science:

Evolutionary Biology
Behavioral Ecology
Animal Behavior

Background:

Lekking behavior in many species is traditionally viewed as male-male competition for mating opportunities, driven by direct fitness benefits.
The role of inclusive fitness benefits, particularly kin selection, in the evolution of lekking has been largely overlooked.
Kin selection theory suggests that males may gain indirect fitness benefits by joining leks, especially if females are attracted to larger aggregations.

Purpose of the Study:

To investigate the potential role of kin selection in the formation and evolution of lekking behavior.
To test the hypothesis that males establish themselves on leks where close relatives are present to maximize indirect fitness benefits.
To examine the genetic structure within leks and its relationship with male mating success.

Main Methods:

Analysis of fine-scale genetic structure within leks of white-bearded manakins (Manacus manacus).
Assessing female attraction to lek size and its correlation with mating success.
Investigating the relatedness of males within lekking groups.

Main Results:

White-bearded manakin leks exhibit extraordinary fine-scale genetic structure, with leks composed of clusters of related kin.
Larger leks are more attractive to females, leading to a higher number of matings.
Males form groups within leks, suggesting they preferentially associate with relatives.

Conclusions:

The findings support the hypothesis that kin selection plays a significant role in lek formation and evolution.
Males may establish themselves on leks to enhance the reproductive success of their relatives, thereby maximizing their own inclusive fitness.
This behavior is consistent with kin-selection theory, where males contribute to the success of kin groups within leks.