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Association between amino acid levels and their costs. The Kendall rank correlation coefficients between the amino acids and the day costs (orange), night cost (black), CW cost from Craig and Weber (1998) (blue), AG cost from Akashi and Gojobori (2002) and the cost from Seligmann (2003) are calculated for a period of 24 h. The night environment is depicted in gray. Correlations which are not significant (P ≥ 0.05) are shown with filled points.
