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QUANTITATIVE DEPENDENCES BETWEEN THE WATER ORGANIC CHARGE AND THE MINERALISATION MICROBIAL POPULATIONS


CARMEN NICOLESCU

Issue:

SCSB, Volume IX

Section:

Volume IX - Bacterias

Abstract:

The natural fish ponds are lake ecosystems in which there is a large amount of organic mater from the natural recycling of the organisms living here and most from the not consumed fodder. The organic dead matter is in various stages of decomposition. The source of the water resident organic matter may be autochthonous, but most of it is allochthonous from many kinds of human activity. Feeding can be considered the major input of organic matter in the fish ponds (Atlas 1997).

The large amount of organic matter induces the development of the specific autochthonous microbiota. Its principal ecological function is the mineralisation of the organic biodegradable substances.

The water quality of the fish ponds depends on the mineralisation activity of the autochthonous microbiota and also of the fresh water flow brought by the water alimentation (Pepper and all. 1995).

The organic matter decomposition is the most important mineralisation step. It is carried out by many groups of microorganisms which follow several subsequent degradation steps up to lower and lower molecular weight compounds. After the decomposition of plant material like cellulose there can result CH4 and other gases like CO2 and H2. After the decomposition of proteins, which are the principal ingredient of the artificial fodder, there can result aminoacids, NH3, H2S. The mineralization-linked microbiota is represented by anaerobes, facultative anaerobes and aerobes.

The ability to decomposition organic matter is strictly specific to heterotrophic organisms (Nicolescu 2002). The intensity of the mineralization process depends on the quantitative and qualitative autochthonous microbiota implicated in the recycling of the organic matter. Some abiotic parameters of the biotope are modeling this process (Zarnea 1994, Pepper and all. 1995). The aim of this study is to perform a quantitative and qualitative analyse of the some mineralisation microorganisms in three natural fish ponds and their quantitative and qualitative dependence on the water organic load.

Keywords:

water organic load, mineralisation bacteria, proteolytic bacteria, aerobic bacteria, anaerobic bacteria, ammonifing bacteria, H2S producing bacteria.

Code [ID]:

SCSB200409V09S03A0001 [0002587]


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