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The biomass of asexual Naididae (Nais spp.) shows a significant positive correlation with the organic carbon weigth (T.O.C.) of nutritive substrates subject to various conditioning (periphyton growing naturally on hydrophytes, periphy­ ton extracts cultivated in glass enclosures immersed in situ, biotecton growing in situ on artificial substrates). The energy role of the T.O.C. is proved because values < 4 of the relationship between T.O.C. (nutritive substrate) and biomass (Nais spp.) produce a depressive effect on the growth rate of Nais populations (density dependent effect). On the other hand, experimentation in situ reveals, as a rule, no significant correlation between the biomass and/or production of Nais spp. and the biomass and/or production of the microphytes (the latter calculated from the develop­ ment of the chlorophyll pigments) whatever value the T.O.C. - chlorophyll relationship can reach. That is due partly to the opportunistic mixed diet in most species of the genus Nais, r-strategists favoured by increasing diversity of the nutritive substrate defined as increasing T.O.C./chlorophyll relationship. The lower growth rates of populations of Nais spp. cultivated on microphytes extracts sterilized with antibiotics, compared with control culture media without antibio­ tics, confirm their mixed diet viz. algivorous and bacteriophagous.

Etude des relations trophiques entre le biotecton et les Naididae (Nais spp., Oligochaeta) : importance du carbone organique (C.O.T.)