Geographical variation in plasma bactericidal ability of breeding tree swallows (Tachycineta bicolor)
David Chang van Oordt, Cédric Zimmer, Conor Claverie Taff…·Maren N. Vitousek
This study examines geographical variation in plasma bactericidal ability (BKA) among tree swallow populations, finding lower BKA in northern populations and during incubation, suggesting trade-offs between reproduction and immunity.