Environmental aspects, Methods, Gene expression, Aquatic plants, DNA, Bacterial - genetics, Bacteria - classification, RNA, Ultrafiltration - methods, Bacteria - isolation & purification, Ribosomal, 16S - genetics, Bacteria - genetics, Ribosomal - genetics, Bacterial - chemistry, Ribosomal - chemistry, Seawater, Sea-water, Contamination, Seawater - microbiol...