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The effect of pH ranging from 8.0 to 6.8 (total scale – pH T ) on fertilization, cleavage and larval development until pluteus stage was assessed in an intertidal temperate sea urchin. Gametes were obtained from adults collected in two contrasting tide pools, one showing a significant nocturnal pH decrease (lowest pH T =7.4) and another where pH was more stable (lowest pH T ...
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