DISTRIBUTION AND VARIABILITY OF PHOSPHATE-MOBILIZING BACTERIA AND PHOSPHOROUS COMPOUNDS IN THE DANUBE COASTAL WATERS
Journal Title: Вісник Одеського національного університету. Біологія - Year 2014, Vol 19, Issue 2
Abstract
In 2010-2012 on the coastal waters of theDanubeRiverthe character of the distribution and variability of phosphorus compounds, as well as the phosphate and heterotrophic bacteria were analyzed. There is lacks of bioavailable phosphorus compounds in the ecosystem of the coastal waters, which is due to excessive intake of nitrogen compounds from the Danube River basin. The number of heterotrophic and the phosphatemobilising bacteria in the surface layer of the seaside exceeds the value in the bottom layer and increases with distance from the edge of the delta. In the bottom layer at various depths the distribution of the bacteria are mainly homogenous. The number of bacteria, mobilizing phosphate from sparingly soluble compounds made 29-78% of the number of heterotrophic bacteria in the surface layer, and 44-85% in the bottom layer. The content of phosphorus compounds generally positively correlated with quantitative indices of the phosphate and heterotrophic bacteria, due to the leading role of "microbial loop" in the biological cycle of phosphorus in the coastal water ecosystem. Negative correlation of the coefficients between the number of bacteria and soluble inorganic compounds and organic phosphorus compounds (p <0.05) were registered only for the bottom layer in November 2012, which is probably due to the full utilization of phosphorus by bacteria and its accumulation in cells. Abiotic environmental factors - temperature and salinity - have no significant impact on the abundance of bacteria. Microbial degradation of organic matter is related to the saturation of water with oxygen and is characterized by an inverse relationship with the number of bacteria in the warm season, and direct - in the cold. Revealed correlations enhance understanding of the ways of phosphorus transformation in water column and the role of bacteria in these processes.
Authors and Affiliations
G. G. Tropivska, Yu. I. Bogatova, I. K. Kurdish
Keywords
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