Vitesse de digestion chez le scéphalopodes Eledone cirrosa (Lamarck) et Illex illecebrosusLesuer = Rate of digestion in the Cephalopods Eledone cirrosa (Lamarck) and Illex illecebrosus (Lesueur)
Boucher-Rodoni, R. (1975). Vitesse de digestion chez le scéphalopodes Eledone cirrosa (Lamarck) et Illex illecebrosusLesuer = Rate of digestion in the Cephalopods Eledone cirrosa (Lamarck) and Illex illecebrosus (Lesueur). Cah. Biol. Mar. 16(2): 159-175
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more
|   |
| Abstract |
In the 2 spp considered there, food digestion starts rapidly, then slows down. The study of the wt changes of food content in the crop and stomach, and of the colour variations of the casecum conten has pointed out the existence of 2 phases in the digestion of ameal in E. cirrosa, the 1st phase being rapid (digestion of 85 to 90% of the total food intake, 1st coloring of the caecum), the 2nd phase being slow (digestion of the remaining food, 2nd coloring of the caecum).Each phase lasts 50% of the total duration of digestion. The end of the 1st phase corresponds to the moment when the crop is empty and the vsrvi, tryitmd to a lighter colour. The digestion depends on the temp, which governs its total duration (30hr at 10°C; 20hr at 15°C; 15hr at 20°C) and, under experimental conditions, alters the synchronization between the phases of digestion and the phases of coloring of the caecum. Digestion efficiency is increased by raising the temp (0.143% of body wt digested per hr at 10°C, 0.21% at 15°C, 0.286% at 20°C).In I. illecebrosus, the digestion of a meal is very fast at the beginning then slows down progressively, but no digestive phases could be precisely defined. This pelagic sp, though loving in relatively cold waters (8 to 13°C), digests a meal rapidly and more efficiently (0.6% of body wt digested per hr) than the benthic spp. |
|
