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Published on: October 1, 2011
Environment-dependent genetic correlations between development time and body mass in a scorpionfly
1Department of Evolutionary Biology and Ecology, University of Bonn, An der Immenburg 1, D-53121, Bonn, Germany. lengqvist@evolution.uni-bonn.de
Zoology (Jena, Germany)
|September 25, 2007
Summary
Life history theory suggests a trade-off between development time and body mass. This study on scorpionflies found that food availability shifted the genetic correlation between these traits, impacting fitness.
Area of Science:
- Evolutionary biology
- Life history theory
- Quantitative genetics
Background:
- Development time and adult body mass are key fitness traits.
- A trade-off between rapid development and larger body size is generally expected.
- Food availability can influence the strength of this trade-off.
Purpose of the Study:
- To investigate the impact of food availability on the genetic basis of development time and body mass in scorpionflies.
- To examine the genotype-by-environment interaction for body mass.
- To determine how genetic correlations between development time and body mass vary with food levels.
Main Methods:
- A food manipulation experiment was conducted on larval Panorpa cognata.
- Development time and body mass (larval and adult) were measured.
- Genetic correlations were analyzed across different food availability treatments.
Main Results:
- Development time exhibited significant genetic variation but was not affected by food level.
- Larval and adult body weight were significantly influenced by food availability.
- A significant genotype-by-environment interaction affected body mass.
- The genetic correlation between body mass and development time shifted from positive under high food to negative under low food.
Conclusions:
- Food availability significantly impacts body mass and influences the genetic relationship between development time and body size.
- The findings support the idea that environmental conditions can alter genetic correlations, affecting evolutionary trajectories.
- This study highlights the plasticity of life history traits in response to environmental factors.
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