| Abstract |
Thracian Sea is located in the North- East Mediterranean Sea and is an area of great interest due to its complicated geomorphology as well as to influences of riverine inputs and Black Sea Waters. This area was chosen in order to study the distribution of total and nucleiod containing bacteria as well as the environmental factors that controls them. Sediment samples were collected from eight different stations using a Bowers and Conelly multiple corer in July 2004 on board the R/V Aegeao. Corers were sliced in seven different layers representing the following depths: 0-1, 1-2, 2-4, 4-6, 6-8, 8-10 and 10-12 cm. The environmental factors determined were organic carbon, black carbon, bioavailable organic carbon, chlorophyll a, phaeopigments and CPE. The amount of n-alkanes was also determined in the surficial sediments (0-1 cm). According to the results, total and nucleoid containing bacterial counts showed a decreasing trend following sediment depth. Their distribution though, showed no significant trend. All the environmental factors followed also a depth decreasing trend. No factor was found to control their distribution. From the analysis of the n-alkanes concentrations is evident that all the n-alkanes are of terrestrial origin and that the area is not polluted from petroleum hydrocarbons. Following statistical procedures, negative correlation was found at the surface sediment between the bacterial distribution and the n-alkanes of terrestrial origin. However, we could not determine any important environmental factor that controls their distribution; these results may likely be explained as the consequences of the strong bottom currents and the tectonic activity of the area.
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Κατανομή των βακτηριακών κοινωνιών και των περιβαλλοντικών παραμέτρων που τις επηρεάζουν, σε θαλάσσια ιζήματα του Θρακικού Πελάγους
