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Biol Bull 68: 207-214. (April 1935)
© 1935 Marine Biological Laboratory
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THE PHYSIOLOGY OF DIGESTION OF PLANKTON CRUSTACEA

I. SOME DIGESTIVE ENZYMES OF DAPHNIA

ARTHUR D. HASLER 1

1 From the Limnological Laboratory, University of Wisconsin

1. A digestive enzyme system exists in Daphnia that enables it to digest considerable protein and carbohydrate within 30 minutes.

2. Microchemical analysis of glycerol extracts of D. magna intestines demonstrated the presence of a proteinase similar to trypsin. Quantitative estimations were made of proteinase activity of whole D. pulex extracts.

3. No pepsin was found in the extracts.

4. Amylase and lipase were chemically demonstrated in extracts of Daphnia.

5. The pH of the alimentary tract of D. magna was found to range from 6.8-7.2.






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Copyright © 1935 by the Marine Biological Laboratory.