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Untersuchungen Über Die Endopeptidase-Aktivität Des Verdauungssystem Der Höheren Krebse (Malacostraca)

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The pH dependency of the endopeptidase activity in various inland Crustacea was investigated using the method of Anson (1939). In the case of Astacus leptodactylus Eschscholtz the optimum for the homogenised hepatopancreas, the hepatopancreatic juice and the stomach juice was at pH 5.2. The curves for stomach juice and homogenised hepatopancreas break at pH 6. It is suggested that here an unknown endopeptidase may also interfere. In the case of the two Amphipoda - Dicerogammarus haematobaphes balatonicus Ponyi and Gammarus (Rivulogammrus) roeselii var. triacanthus Schaferna - the optimum for the hepatopancreas tubes was identical at pH 6.6-7.1. In contrast to Astacus, here no differences could be detected in the activity curves of the homogenised hepatopancreas and the hepatopancreas juice. Owing to technical difficulties, only the homogenised hepatopancreas was investigated in Asellus aquaticus (L.) and Limnomysis benedeni Czerniavski. The pH optimum was at 5.5-6.0 in Asellus and at 7.3-7.5 in Limnomysis. On the basis of these data it is suggested that the pH dependency of animals living in the same biotope and feeding in the same way is different. On the other hand, in the two phylogenetically closely related Amphipoda it is identical although their food is different.

Affiliations: 1: Biologisches Forschungsinstitut der Ungarischen Akademie der Wissenschaften, Tihany, Ungarn

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