a strong trendP = 0.058
When males transitioned from breeding to non-breeding, there was a strong trend toward a decrease for phylogenetic diversity (−23% from 26.0 to 20.1, t = 2.3, P = 0.058, Fig. 1b ), but no change in the number of observed OTUs ( t = 1.6, P = 0.15, Supplementary Fig.