南極リュッオ・ホルム湾における海水と海氷中の珪藻, およびそれらの底質中での保存

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Quantitative floral analyses have been performed on sea water and sea-ice samples collected from two sites near East Ongul Island in Lutzow-Holm Bay, Antarctica. Fifty-nine diatom species and varieties belonging to 28 genera were identified in the samples. Nine species dominate the sea water assemblage; Chaetoceros neglectum, Chaetoceros tortissimus, Fragilaria (?) sp. a, Nitzschia curta, Nitzschia cylindrus, Nitzschia lecointei, Nitzschia turgiduloides, Nitzschia vanheurckii and Porosira pseudodenticulata. High abundance of the following 10 species characterize the sea-ice assemblage; Berkeleya sp. a, Eucampia balaustium, Nitzschia closterium, Nitzschia curta, Nitzschia cylindrus, Nitzschia lecointei, Nitzschia stellata, Nitzschia turgiduloides, Pinnularia quadratarea, Pleurosigma sp. a, Rhizosolenia alata and Tropidoneis sp. a. Floral composition of the sea water and sea-ice samples are reflected in those of the underlying surface sediments of the bay, while diatoms with poorly silicified valves are less common in the sediment flora compared to the water column and/or sea-ice floras. Two important species associated with sea-ice and the underlying water, N. curta and N. cylindrus, occur commonly in the sediments after allowing for dissolution, and the predominance of these two forms may be a good indicator of the environment covered and/or strongly influenced by sea-ice. Other corrosion resistant ice forms, resting spore of Eucampia balaustium and Pinnularia quadratarea, have also been discriminated as supplementray guide taxa for near ice environment.
国立科学博物館の論文
1990-03-22

南極リュッオ・ホルム湾における海水と海氷中の珪藻, およびそれらの底質中での保存

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