Data from: Stable isotopes reveal differences in diet among reed bunting subspecies that vary in bill size

Júlio Manuel Neto, Luís De Oliveira Gordinho, Benjamin Vollot, Marcial Marín, Juan S. Monrós & Jason Newton
Reed bunting (Emberiza schoeniclus) subspecies vary considerably in bill size and shape and seem to be at an early stage of speciation, in which bill might be indirectly causing reproductive isolation. Hence, we evaluated whether bill size, as well as age and sex, are associated with foraging niche in three West European subspecies of reed bunting: the thin-billed schoeniclus, the intermediate-billed lusitanica and the thick-billed witherbyi. Blood sampling was undertaken at three sites in southwest...
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