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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 6003

E. Fischer, J. Filip, and L. Molnar; The effect of Bivalent heavy metals on the Oxygen-dependent nuclear volume alterations of the chloragocytes in Tubifex tubifex Mull. Environ.Pollut.A 23:261-265, 1980

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The effects of Ba2+, Co2+, Fe2+, Mn2+, Zn2+ and Cu2+ on the oxygen-dependent nuclear volume alterations in the chloragocytes of T. tubifex were examined karyometrically and compared with those of Cd2+ and Pb2+. Under aerated conditions Cd2+, Mn2+, Fe2+ and Pb2+ significantly stimulate nuclear expansion. Hypoxia-induced nuclear expansion, however, may be diminished by Cu2+, Co2+, Ba2+ and Pb2+. Only Zn2+ has no significant effect on the nuclear volume alterations. Results which consider both the metabolic pathways of the chloragocytes of T. tubifex and the known physiological effects of the heavy metals are discussed.