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Parmarion martensi mean weight change of survivors in each cohort (with 2 standard error cloud) over time post‐irradiation treatment in each age class. Weight gain was reduced in all age groups after irradiation. The upward trending weight gain line in the 2‐week‐old graph represents the one surviving semi‐slug at 150 Gy which continued to feed and grow for the duration of the experiment, but without laying eggs.
