北海道東部厚岸湖および厚岸湾における微生物食物網を構成する微生物群の春季から初夏の変動

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  • Temporal fluctuations of constituent microorganisms of the microbial food webs from spring to early summer at Akkeshi-ko estuary and Akkeshi Bay, eastern Hokkaido, Japan
  • ホッカイドウ トウブ アツケシコ オヨビ アツケシワン ニ オケル ビセイブツ ショクモツモウ オ コウセイ スル ビセイブツグン ノ シュンキ カラ ショカ ノ ヘンドウ

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Temporal fluctuations of bacteria, heterotrophic nanoflagellates (HNF), autotrophic nanoflagellates (ANF) and ciliates were investigated from spring to early summer at the stations in Akkeshi-ko Estuary with large scale seagrass bed of Zostera marina and Akkeshi Bay, Eastern Hokkaodo, Japan.　The ranges of bacterial density were 5.4×105-3.0×106 cells mL-1 in Akkeshi-ko Estuary (Stn. 1) and 2.3×105-1.9×106 cells mL-1 in Akkeshi Bay (Stns. 2, 3).　The ranges of HNF were 3.1×102-3.3×103 cells mL-1 in the estuary and 2.2×101-1.1×103 cells mL-1 in the bay.　The densities of ANF were 1.8×102-5.0×104 cells mL-1 (Stn. 1) and 2.2×101-3.6×104 cells mL-1 (Stns. 2, 3).　The densities of microorganisms were higher in the coastal area than offshore. 　In contrast, ciliate densities were <80-9.8×103 inds. L-1 in the estuary and <80-1.1×104 inds. L-1 in the bay.　Significant correlations were found between HNF and ANF, temperature and them, suggesting that major parts of ANF were mixotrophs of bacterial grazers like HNF.

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