Modeling the Evolution of Rates of Continuous Trait Evolution.

In the presence of a strong trend, only the oldest and youngest lineages will generally exhibit anomalous rates, rendering anomalous rate detection redundant with trend estimation.

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We found marginally significant support for a decreasing trend in rates over time, with rates declining by about 7% every million years (95% CI: 0%–15% decrease, PP of increasing trend: 2.5%).

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