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Regulation index (RI) for each of the four Antarctic amphipod species studied, indicating the phylogenetic relatedness of the species, and the body size categories (wet mass) of all individuals examined. All data are normally distributed (Anderson–Darling ≤ 0.297, p ≥ 0.347) and variances were not significantly different (multiple comparisons, p = 0.347). M = P. miersi, B = P. brevicornis, G = S. gracilis, O = P. ovata.
