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Physiological Stress Mediates the Honesty of Social Signals

Figure 4

Relationship between corticosterone (pg/mm) in feathers and changes in comb area (mm2) of male red grouse between C1 and C2, according to treatment.

a) T0: control implanted males; b) T+: testosterone implanted males. Parasite treatments: P0: purged of worms; P+: challenged with T. tenuis infective larvae.

Figure 4

doi: https://doi.org/10.1371/journal.pone.0004983.g004