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Fertilization success under different experimental conditions. (a,b) Fertilization success under current conditions, (c,d) difference in fertilization success between current and acidified conditions and (e,f) relationship between current fertilization and difference in fertilization under acidified conditions in Lytechinus pictus and Heliocidaris erythrogramma. Different letters below plots (a–d) indicate individual males. (Online version in colour.)
