Polygyny is linked to accelerated birdsong evolution but not to larger song repertoires.

Nat Commun · 2019 · PMC6385279 · PMID 30792389

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a positive trendno p-value reported

Some studied species show a positive trend: rates of EPP were higher in males with larger repertoires (great reed warblers 24 ) or with increased song diversity (reed bunting 32 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.