Extended Data Fig. 2: Diagram showing how subclade disparity through time is calculated as test of early partitioning of morphospace, showing idealized contrasting patterns of morphological evolution.
From: Environmental signal in the evolutionary diversification of bird skeletons
a) Example time-calibrated phylogeny and points in time (cladogenesis events) for which b) subclade disparities values are calculated for a Brownian model of diffusive evolution and two alternative modes of morphological evolution. c) Corresponding patterns in morphospace exploration over time for two idealised patterns of morphological evolution: early partitioning of trait space (morphospace) in which morphological evolution is constrained at the level of subclades, and a non-partitioned pattern in which constraints are similar in the total group and within subclades.
