Der Einfluss von Kohlenwasserstoffen auf die Ökologie der Bakterien im aeroben Seesediment

Abstract

Influence of hydrocarbons on ecology of bacteria in aerobic lake sedimentTwo different hydrocarbon loadings of sediment cores were analyzed 4 times during 21 days. Applied methods were: Direct count, isolation of more than 100 colonies on a diluted plate-count agar and estimation of 42 attributes (282 levels), followed by a single link clustering and calculation of the information basing on attribute level (i.e. negative entropy). Loading of 100 g fuel oil/m 2. sediment caused a depletion of germs and information. Full restoration could not be observed. When 10 g fuel/m 2 was applied there was no significant effect, but if algae were supplied too, the effect was similar to using 100 g/m 2. An extrapolation of the results gives a tolerance of hydrocarbon loading for Lake Constance or Lake Zug of 10 to 20 times the load present, but effects on fishes or fishfood were not considered. 1) Die Arbeit wurde an der Eidgen~ssischen Anstalt Far Wasserversorgung, Abwasserreinigung und Gewasserschutz (EAWAG) in D@bendorf ausgefOhrt. Kurzfassung ETH Diss. Nr.6121.