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Environmental Conditions during Development Affect Sexual Selection through Trait-Fitness Relationships.
The American Naturalist
|January 3, 2022
Summary
Environmental conditions during early life stages significantly influence sexual selection in damselflies. Juvenile environments shape adult traits and mating success, highlighting the importance of prereproductive development for sexual selection.
Area of Science:
- Ecology
- Evolutionary Biology
- Behavioral Ecology
Background:
- Sexual selection, a key evolutionary process, can vary spatially due to environmental differences.
- Previous research focused on adult environmental factors influencing sexual selection, neglecting early life stage impacts.
Purpose of the Study:
- To investigate how juvenile environmental conditions affect sexual selection on male body size in *Enallagma* damselflies.
- To determine the pathways through which early-life environments shape sexual selection.
Main Methods:
- Studied two species of *Enallagma* damselflies.
- Assessed environmental factors during the larval (juvenile) stage, including predation, primary productivity, and habitat availability.
- Analyzed the effects of these factors on sexual selection of male body size.
Main Results:
- Spatial variation in sexual selection is influenced by juvenile environmental factors.
- Predation pressure, lake primary productivity, and habitat availability during the larval stage play a significant role.
- Environmental effects on sexual selection primarily operate through fitness-trait relationships, not mean fitness or trait variances.
Conclusions:
- Environmental conditions during prereproductive stages are critical underpinnings of sexual selection in natural populations.
- Early-life environments can shape the trajectory of sexual selection observed in adults.
- Understanding juvenile ecology is essential for comprehending the evolution of mating systems.
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