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09:34
Assessing Differences in Sperm Competitive Ability in Drosophila
Published on: August 22, 2013
Kin selection, local competition, and reproductive skew
1Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, United Kingdom. raj1003@hermes.cam.ac.uk
Evolution; International Journal of Organic Evolution
|August 12, 2008
Summary
Limited dispersal in structured populations can favor helping or harming behaviors. When individuals have different reproductive potential, dispersal influences kin selection, increasing reproductive inequality.
Area of Science:
- Evolutionary biology
- Behavioral ecology
- Population genetics
Background:
- Limited dispersal in spatially structured populations creates local relatedness, potentially favoring helping behaviors.
- However, local competition resulting from limited dispersal can reduce the benefits of aiding kin, creating a theoretical tension.
- Previous models primarily examined the net effect of limited dispersal on cooperation or competition in uniform populations.
Purpose of the Study:
- To extend kin selection models to group-structured populations with varying fecundity and reproductive success.
- To investigate how limited dispersal influences the evolution of helping and harming behaviors.
- To analyze the impact of limited dispersal on reproductive inequality (skew).
Main Methods:
- Theoretical modeling of kin selection in group-structured populations.
- Inclusion of asymmetries in expected fecundity and reproductive success among group members.
- Analysis of the evolutionary consequences of limited dispersal under these conditions.
Main Results:
- Limited dispersal drives kin selection for harming behavior in more fecund individuals.
- Limited dispersal drives kin selection for helping behavior in less fecund individuals.
- Philopatry (limited dispersal) exacerbates reproductive success differences, leading to increased reproductive skew.
Conclusions:
- Asymmetries in fecundity within groups, combined with limited dispersal, lead to distinct helping and harming behaviors driven by kin selection.
- Limited dispersal amplifies reproductive inequality, promoting greater reproductive skew within structured populations.
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