A statistical fix for comparing traits across the tree of life
In short: Researchers studying evolution often want to know whether two traits—say, body size and home range—evolve together. But closely related species share ancestry, which can make traits look linked when they are not. This paper refines Felsenstein's method of phylogenetically independent contrasts, which maps traits onto a family tree to strip out that shared history before testing for correlated evolution.
The authors show the method works without a fully resolved tree or an assumption of steady, clock-like evolution, and that branch lengths can come from genetic distances, fossils or molecular clocks, as long as their adequacy is checked for each tree and trait by plotting standardized contrasts against their standard deviations. They illustrate this with mammalian home range size and conclude any continuous trait inherited from ancestors, genetic or cultural, can be analysed this way. It is a statistical method, not a new biological finding.
Why it matters: A statistical way to test if traits evolved together across species without being fooled by shared ancestry.
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Sources
- Summary by Intellect · source: Research: Garland et al. (1992). Procedures for the Analysis of Comparative Data Using Phylogenetically Independent Contrasts. Systematic Biology.
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