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Soil nematodes Cephalobus persegnis (Bastian 1865) originating from a laboratory culture maintained at 20 stopni C cultured for three successive generations at 15 stopni C, 21 stopni C, or 15/21 stopni C for 12 hours in each temperature. Transfer of the nematodes to 15 stopni C markedly depressed their fecundity and growth of F1 worms. In next generations fecundity restored while size of the nematodes...