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Differences in the feeding activity between different forms of earthworms eisenia nordenskioldi


, : Differences in the feeding activity between different forms of earthworms eisenia nordenskioldi. Zoologicheskii Zhurnal 63(11): 1610-1615

Food ration value was estimated in representatives of 12-ploid and diploid forms of E. nordenskioldi occurring in the same habitats near Novosibirsk [Russian SFSR, USSR]. The representatives of different forms are distinguished by the character of food specialization and the value of food rations. The 12-ploid form, primary destroyer of the leaf fall, consumes 178.8 mg/g of live wt per day and the diploid form, detritophage feeding in the humus horizon, consumes up to 574.9 mg/g of live wt per day. The differences in the ration values in these worms are determined mainly by the rate of food digestion. The mass of food in the intestine per body wt unit in the detritophages is lower than in the primary destroyers. In individual populations of E. nordenskioldi with different food specialization, irrespective of their genetic differences, an inverse dependence of the value of food consumption coefficient and the rate of its digestion was established. Quantitative characteristics of the feeding activity in representative of individual populations of the polyploid E. nordenskioldi from different geographic regions are discussed.

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