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This study tested the hypotheses (1) that the upper shore rock pool harpacticoid copepod Tigriopus brevicornis is protected against ultra-violet radiation (UVR) by the orange pigment astaxanthin, and (2) that astaxanthin levels would be greater in summer than winter. Wild orange copepods lost their pigment and became white if fed on yeast in the dark; their colour was restored when they were fed microalgae. White T. brevicornis were significantly more susceptible to UVR than wild or restoreddoi:10.3354/meps276299 fatcat:zk2er2yovnazpifce5q2pg5ct4