Microbial communities of eelgrass (
Zostera marina) leaves, seawater and sediments in the eelgrass bed, Tanoura Bay, Shimoda, Shizuoka in summer were examined by the clone library and qPCR methods. Direct counts of bacteria were 2.1×10
6-6.9×10
6 cells/cm
2 on the eelgrass leaves, 3.1×10
6-1.5×10
7 cells/m
l in seawater and 1.2×10
8-2.4×10
8 cells/g in sediments. The predominant clones closely related to Pseudomonadaceae, Rhodobacteriaceae and Flavobacteriaceae accounted for 11.1-14.3% of all 315 clones in the eelgrass bed. Fish pathogens were not detected in six 16S rDNA-clone libraries. The sulfate-reducing bacteria (SRB) were 2.5×10
5-2.8×10
5 copies/g in sediments, corresponding to the level of unpolluted area. These results suggest that the eelgrass bed in Tanoura Bay does not currently pose any particular problem as a fish habitat.
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