Fig. 2: Path models showing causal relationships between the evolution of niche components and species diversity in Nearctic aphids. | Communications Biology

Fig. 2: Path models showing causal relationships between the evolution of niche components and species diversity in Nearctic aphids.

From: Geographic isolation drives speciation in Nearctic aphids

Fig. 2

Values on edges are standardized mean differences for the combined effects of the first two principal components for variables representing environmental niches and host-use niches. Arrow width indicates relative strength of effect. The p-value provided for each model is for a Chi-squared tests of goodness-of-fit; as a rule of thumb, values >0.5 indicate a good fit to the data. a Best model of the causes of variation in the species richness of aphid genera. b Best model of how host-use evolution and environmental niche evolution affect speciation rate. c Best model of how the host-use evolution, host-use breadth evolution, and environmental niche evolution affect speciation rate.

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