播磨灘, 燧灘海域における粒径の異なる粒状物質に付着する細菌の分布

抄録

TAKEUCHI, Jun-ichi & HATA, Yoshihiko (Fac. Agr., Kochi Univ., Kochi). 1985. Distribution of bacteria associated with various sizes of particulate matter in Harima-nada and Hiuchi-nada areas, Seto Inland Sea, Japan. Jap. J. Ecol., 35 : 49-56. The size-distribution patterns of bacteria associated with suspended, sinking and sedimented particles were investigated in coastal waters. Seawater, newly-formed deposits and bottom mud samples were collected from Harima-nada area, which is highly polluted with industrial wastes, and Hiuchi-nada area, which is contaminated with effluent from a pulp mill. The collected samples were then sizefractionated with nylon mesh nets and Nuclepore filters to elucidate the relationship between the size of particulate matter and the number of associated bacteria. In the seawater collected from Harima-nada area, 50-90% of aerobic heterotrophic bacteria were free-living, while 70-90% of those in the newly-formed deposits or the bottom mud from the same area were attached to the particles, of which particles having 10-50 μm diameter were most abundant in the bacteria. In a polluted site of Harima-nada area, nearly half of the bacterial isolates from both the newly-formed deposits and the bottom seawater were denitrifying bacteria. In a pulp-contaminated site of Hiuchi-nada area, a great number of cellulolytic bacteria were found ; however, none of them could be detected in a free-living state in the bottom mud samples.