Oxygen and Hæm in Invertebrates

Abstract

THE quantity of hæmoglobin in solution in the blood of Daphnia is inversely proportional to the dissolved oxygen content of the water in which the animals live1,2. In the course of a few days Daphnia can change in tint from almost colourless to red, or the reverse, by the synthesis or breakdown of hæmoglobin. This occurs, too, in other branchiopod Crustacea (for example, Estheria, Apus, Artemia). Since a gain of blood-hæmoglobin with fall of external oxygen pressure is known also in man at high altitudes and fishes in poorly aerated water, one may ask if it occurs in all animals with hæmoglobin.

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FOX, H. Oxygen and Hæm in Invertebrates. Nature 174, 355 (1954). https://doi.org/10.1038/174355a0

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