Supplementary material: How should functional relationships be evaluated using phylogenetic comparative methods? A case study using metabolic rate and body temperature

Josef Uyeda, Nic Bone, Sean McHugh, Jonathan Rolland & Matthew Pennell
Phylogenetic comparative methods are often used to test functional relationships between traits. However, million-year macroevolutionary observational datasets cannot definitively prove causal links between traits --- correlation does not equal causation and experimental manipulation over such timescales is impossible. While this caveat is widely understood, it is far less appreciated that different phylogenetic approaches make different causal assumptions about the functional relationships of traits. In order to make meaningful inferences, it is critical that our statistical...
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