Kr/Kc but not dN/dS correlates positively with body mass in birds, raising implications for inferring lineage-specific selection.

However, while controlling the correlation between body mass and d N / d S for divergence time leads to a reduction in the correlation coefficient (partial Spearman’s rank correlation β =−0.3211, P =0.0480, compared to ρ =−0.4106, P =0.0122 for d N / d S versus mass for the filtered data set), it does not altogether remove the relationship, which remains marginally significant.

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