Abstract
In Great Britain there are three common species of Daphnia living in ponds and ditches, namely, D. magna Straus, D. pulex (De Geer) and D. obtusa Kurz. They are often coloured pink or red by hæmoglobin in solution in the blood1. Other species, found in lake plankton, have colourless blood. The blood of any of the pond species may vary from red to pale pink or colourless in different localities, or in the same pond at different times. In the laboratory individuals can gain or lose hæmoglobin in the course of a few days. When anæmic, Daphnia is as vigorous as when its blood is red.
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References
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Verne, J., Bull. Soc. Zool. Fr., 48, 140 (1923).
Teissier, G., C.R. Soc. Biol. Paris, 109, 813 (1932).
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FOX, H. Daphnia Hæmoglobin. Nature 160, 431–432 (1947). https://doi.org/10.1038/160431a0
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DOI: https://doi.org/10.1038/160431a0
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