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A) Number of clusters of ecologically similar individuals (identified by a hierarchical Bayesian model) correlated with the number of parental species sampled in a river (Pearson correlation 0.764, p < 0.05). B) Extent of backcrossing in flannelmouth×white hybrids negatively correlated with isotopic niche area overlap in 6 river locations (Pearson correlation −0.922, p < 0.05).
