Trait associations across evolutionary time within a drosophila phylogeny: correlated selection or genetic constraint?

Abstract excerpt

Traits do not evolve independently. To understand how trait changes under selection might constrain adaptive changes, phenotypic and genetic correlations are typically considered within species, but these capture constraints across a few generations rather than evolutionary time. For longer-term constraints, comparisons are needed across species but associations may arise because of correlated selection pressures...

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