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Sex roles and mutual mate choice matter during mate sampling
Lise Cats Myhre1, Karen de Jong, Elisabet Forsgren
1Department of Biology, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway.
The American Naturalist
|May 24, 2012
Summary
Sex role dynamics significantly impact mating competition and mate choice in the marine fish Gobiusculus flavescens. Behavioral patterns shift throughout the breeding season, demonstrating the fluidity of sexual selection.
Area of Science:
- Evolutionary Biology
- Behavioral Ecology
- Animal Behavior
Background:
- Sexual selection theory posits that sex roles in mating competition and mate choice are relatively fixed.
- Recent evidence suggests greater variability in these roles across and within species than previously understood.
- Understanding these dynamics is crucial for comprehending evolutionary processes.
Purpose of the Study:
- To investigate the impact of temporal shifts in sex roles on mating competition and mate choice.
- To examine how changes in the breeding season affect mating behaviors in a model organism with reversed sex roles.
- To provide empirical data on the dynamic nature of sexual selection.
Main Methods:
- Utilized the marine fish Gobiusculus flavescens, known for its seasonal reversal of sex roles.
- Observed and recorded courtship initiation and termination patterns throughout the breeding season.
- Quantified mate-searching behaviors, specifically the number of males visited by females at different times.
Main Results:
- Early in the breeding season, males typically initiated courtship, and females terminated interactions.
- Late in the season, sex roles reversed, with females initiating courtship and multiple females often pursuing a single male.
- Mate-searching females exhibited distinct visitation patterns, visiting more males early than late in the season.
Conclusions:
- The study confirms that sex role theory predictions align with observed behaviors in Gobiusculus flavescens.
- Mutual mate choice and mating competition significantly influence both female and male behaviors.
- Future research must incorporate the dynamic nature of mating competition and mate choice to fully understand sexual selection.
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