How Fisherian runaway halts: Genomic architecture determines the long-term evolutionary consequences of sexual selection.

Genetic architecture of sexual displays determines how Fisherian runaway halts, governing long-term evolutionary dynamics under sexual selection when idealized model assumptions are violated.

• Why it matters: Runaway mate preferences are plausible in idealized theory, but it is unclear how runaway stops after evolution changes conditions, and how display genetics shape the outcome.
• What they did: The work synthesizes theories into four categories of runaway-halting mechanisms tied to which assumptions in Lande’s (1981) model break, and runs individual-based simulations varying display inheritance from additive to omnigenic.
• The result: The simulations show that the way displays are genetically inherited controls the runaway-halting pathway, implying different long-term evolutionary trajectories under sexual selection depending on architecture.

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