On pH conditions of the alimentary canals of some Crustaceans

P.-Zánkai, Nóra (1966) On pH conditions of the alimentary canals of some Crustaceans. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 33. pp. 217-231. ISSN 0365-3005

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Abstract

The pH conditions of the juices in the alimentary canal of 6 Crustaceans (Limnomysis benedeni, Dicerogammarus haematobaphes balatonicus, Dicerogammarus villosus bispinosus, Gammarus roeseli, Asellus aquaticus, Astacus leptodactylus were examined with the aid of 3 methods. In the case of Limnomysis the pH of the stomach > 6.0 or 6.1 respectively and <7.1, of the hepatopancreas 6.0 - 6.1 The beginning and the end of the medium intestine can often be separated on the basis of the pH differences. The intestinal juice indicates values of 7.4-7.8 pH. In Amphipoda the anatomically unitary medium intestine can be divided according to the pH conditions of its juice in 3 parts: the pH of part 1 coincides with the pH of the hepatopancreas. Section 2 lasts about to the end of the posterior dorsal coeca, it is often readily recognizable, in other cases indistinct, its pH is sometimes acid (hepatopancreatic effect) in other cases neutral (upon the action of the juice of the posterior dorsal coeca). In the last third of the intestine the pH is always alkaline. The pH conditions of the digestive juices of Dicerogammarus are as follows: stomach 5.8-6.4, hepatopancreas 5.8-6.1, medium intestine 2nd third 7.1-7.4, medium intestine 3rd third 7.6-8.1. In the case of Gammarus roeseli: stomach 6.0—6.6, hepatopancreas 5.8-6.2, medium intestine 2nd third 7.1-7.8, 3rd third 7.6-8.0. In the case of Asellus aquations the anatomically readily separating stomach and medium intestine on the basis of the pH of their juices must be drawn together, so the pH of the hepatopancreas is 6.1, that of the stomach and medium intestine nearly neutral. It has been further established that seasons and starving do not essentially influence the pH of the digestive juices. Author establishes a parallel between the pH optimum obtained with biochemical methods of the gastric juice of some species and the natural pH conditions.

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