 ISSN 0235-7224 ISSN 2029-0586 (online) |
2008 m. Nr. 4 Bacteria in the digestive system of molluscs
from Lithuanian lakes
The abundance of bacteria (total heterotrophic, proteolytic, total coliform and hydrocarbondegrading) in the digestive system of bivalve molluscs Anodonta cygnea, Unio tumidus (Birva and Spėra Lakes) and Dreissena polymorpha (Skaistis Lake) has been studied. Bacteria counts in the digestive tract of molluscs were found to differ and vary depending on species and the water basin. In the digestive tract of A. cygnea and U. tumidus from Lake Spėra the bacterial counts were similar. In Lake Birva, a higher abundance of the heterotrophic and proteolytic bacteria has been found in the digestive tract of A. cygnea than in U. tumidus. In the digestive tract of molluscs, hydrocarbon-degrading bacteria constituted 0.09% (D. polymorpha, Lake Skaistis) to 24.22% (U. tumidus, Lake Spėra) of the total heterotrophic bacteria. In the water of the lakes, there were 17.3% (Lake Skaistis) to 33.89% (Lake Spėra) of hydrocarbon-degrading bacteria. A less significant abundance was found in the cenosis of the digestive tract of D. polymorpha (Lake Skaistis). According to the average values of hydrocarbon-degrading bacteria and the total number of coliform bacteria, Lake Skaistis ecosystem was least polluted with oil and its products, the Lake Spėra ecosystem was polluted most heavily, and the ecosystem of Lake Birva less than the Lake Spėra ecosystem and more than the Lake Skaistis ecosystem. Keywords: molluscs, digestive tract, bacteria, hydrocarbon-degrading bacteria |
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