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Plasmodium infection in relation to breeding density and age. Infection of a) P. relictum, and b) P. circumflexum in adult great tits (first year breeders and older) in relation to experimental manipulation of breeding density (LD = low density, HD = high density). Mean ± Confidence Intervals (CI), presence = 1 and absence = 0, i.e., the higher value the larger proportion is infected.
