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Box plots depicting Ig and glucose/lactate concentrations across the years 2015 and 2016 in juveniles (Juv) and the 2016 summer breeding season in adult males (Ad M). Pre- Br: pre-breeding season; Post- Br: post-breeding season. Central lines in boxes are medians, and whiskers are 95% confidence intervals with outliers. *grouped by a horizontal line denotes significant differences between years for Juv or seasons for Ad M according to post-hoc Student’s t-tests (P < 0.05).
