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A potential role for restricted intertactical heritability in preventing intralocus conflict
Madilyn M Gamble1, Ryan G Calsbeek1
1Graduate Program in Ecology, Evolution, Ecosystems, and Society Dartmouth College Hanover NH USA.
Evolutionary Applications
|November 24, 2021
Summary
Intralocus conflict, where traits have different optima for males and females or within male tactics, can limit population growth. In Coho salmon, this conflict was absent, allowing for the evolution of sexual and tactical dimorphisms.
Area of Science:
- Evolutionary Biology
- Behavioral Ecology
- Population Genetics
Background:
- Intralocus sexual conflict arises when a trait has different fitness optima for males and females, potentially reducing population growth.
- Intralocus tactical conflict occurs when traits have different optima among reproductive tactics within a sex, potentially constraining dimorphism and population growth.
- Simultaneous investigation of sexual and tactical intralocus conflict is a recent area of research with limited theoretical frameworks.
Purpose of the Study:
- To develop a graphical model for understanding how simultaneous sexual and tactical conflict constrains dimorphisms.
- To investigate the presence of simultaneous sexual and tactical conflict in Coho salmon (Oncorhynchus kisutch) concerning male length at maturity.
- To determine if intralocus conflict constrains sexual and tactical dimorphisms in Coho salmon populations.
Main Methods:
- Developed a graphical model to illustrate the interplay of sexual and tactical conflict on dimorphisms.
- Analyzed selection on male length at maturity across sexes and reproductive tactics (fighting vs. sneaking) in Coho salmon.
- Utilized parent-offspring regression to estimate sex- and tactic-specific heritabilities of male length.
Main Results:
- Selection on male length varied in intensity and form across tactics and years.
- Length was heritable between female parents and daughters and between fighting males and their fighting sons.
- No significant inter-tactic heritabilities were found, suggesting a lack of intralocus conflict between tactics.
Conclusions:
- The absence of intralocus conflict between sexes and among tactics in Coho salmon allows for the evolution of sexual and tactical dimorphisms.
- Coho salmon populations are unlikely to be constrained by intralocus conflict or artificial selection on male tactics.
- Findings contribute to understanding the evolutionary dynamics of conflict and dimorphism in wild populations.
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