On the Hemoglobin in Daphnia(Crustacea: Cladocera).
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概要
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The concentration of Hb in Daphnia magna hemolymph is inversely related to the O2 concentration of its aquatic habitat. Under low oxygen conditions, immature animals are most capable of Hb synthesis. Hb-rich animals can swim a longer distance even in very low O<SUB>2</SUB> concentration in which Hb-poor animals are able to swim only a short distance. Daphnia magna is an O<SUB>2</SUB> regulator, and Hb-rich animals have a lower critical O<SUB>2</SUB> concentration than that of Hb-poor animals. The fifty per cent of in vivo oxygenation of Hb is found at 15 and 35 torr for Hb-rich and Hb-poor animals, respectively.<BR>The purified Hb from Hb-rich animals has a higher O<SUB>2</SUB> affinity than that from Hbpoor animals. Hemoglobin is separated into at least six components by isoelectric focusing. Hemoglobin solution from Hb-rich animals has a different proportion of the Hb component from that of Hb-poor animals, and the increase in O<SUB>2</SUB> affinity is concomitant with an increase in the relative amounts of Hb components of high isoelectric point. This suggests that Daphnia magna may adapt to a wide range of environmental O<SUB>2</SUB> conditions by means of multiple Hb.
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