Occurrence of clostridia in the sediment of an extremely polluted Danube reach.
The species composition of clostridial communities of the sediment in a polluted area of the Danube (South of Budapest, Háros-Bay, Hungary) was investigated.
The spore counts exceeded 700800 CFU per gram (wet weight). 23 clostridial strains were identified by using API 20A anaerobe identification kits, another 20 physiological, biochemical, and ecological tests were also carried out.
Results of numerical analysis showed that the clostridial community in the sediment of the Danube is composed of at least 4 different species.
Members of C. perfringens, indicating to fecal contamination, C. subterminale and related bacteria were dominant in the examined area.
All strains showed wide pH (5... 9) and temperature (3... 45 °C) tolerance.
They were able to grow on media containing significant amounts of lead (Pb2+), mercury (Hg2+), copper (Cu2+), and zinc (Zn2+). Strains of C. perfringens showed a wide range of degradative capacities (acid production from many different carbohydrates, gelatinase, lecithinase, lipase production, etc.).
Mots-clés Pascal : Clostridium, Clostridiaceae, Clostridiales, Bactérie, Cours eau, Contamination biologique, Sédiment, Identification, Spécificité espèce, Dénombrement, Facteur milieu, Métal lourd, Tolérance, Pollution eau, Milieu eau douce, Hongrie, Europe, Rivière Danube
Mots-clés Pascal anglais : Clostridium, Clostridiaceae, Clostridiales, Bacteria, Stream, Biological contamination, Sediments, Identification, Species specificity, Enumeration(counting), Environmental factor, Heavy metal, Tolerance, Water pollution, Freshwater environment, Hungary, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0156552
Code Inist : 002B30A02A. Création : 16/11/1999.