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Fig. 4 | BMC Biology

Fig. 4

From: Wonky whales: the evolution of cranial asymmetry in cetaceans

Fig. 4

Reconstructed probability of shifts in cetacean cranial asymmetry. Reconstructed probability along each branch of the phylogeny under the assumption of relaxed Brownian motion with a Half-Cauchy distribution for the prior density of the rate scalar. Circles indicate a shift in the trait on either the branch or in the whole clade. The colour of the circle indicates the shift direction with red indicating forward shifts and blue indicating backwards shifts. The size of the circle indicates the probability of the shift occurring in that position in the clade with the largest circle (here, 0.750) indicating the highest probability of a shift occurring. The colour of the branch itself indicates posterior rates for that branch with red showing higher, increasing rates and blue showing lower, decreasing rates. The background rate is shown as grey. The asymmetry value is given as the sum of radii per specimen (∑pspec). A trace of the chain is provided in Additional file 1: Fig. S10—Gelman diagnostics for the two chains. Phylogeny based on Lloyd and Slater [29]

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