The distribution of several genera of filamentous bacteria was determined in profundal and littoral sediments of three lakes of differing trophic status. The bacteria were tentatively identified on the basis of cytochemical tests and microscopic observations of organisms in wet mount preparations and on agar-coated and uncoated slides incubated in the sediment cores. The population density and the diversity of the filamentous bacteria increased with increasing nutrient content of the lakes. The general observations of higher numbers in the profundal than in the littoral zone and a decrease in population density with sediment depth were confirmed for most genera. Some of the genera may be microaerophiles. An affinity for surfaces was observed. usually occurred only in littoral samples and only in the two richer lakes. was found mainly in the two richer lakes and was present in large numbers in all three lakes.


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