Abstract
The concentration of hemoglobin (Hb) in early embryos of Daphnia magna is higher than that in hemolymph of adult Daphnia magna. The oxygen tension in ambient water at which Hb in early embryos was 50% oxygenated was 30 torr in eggs of Hb-poor animals and 17 torr in those of Hb-rich animals. These agreed with the data of in vivo oxygenation of the Hb in the hemolymph of their respective parents. Hb in early embryos of Hb-rich animals required a longer time for deoxygenation than that in early embryos of Hb-poor animals. A longer time was required for early embryos Hb than for adult animals Hb to be deoxygenated in an anoxic environment.
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