Planktonic Diatoms in Pelagic Silicate Cycle in Lake Biwa.
スポンサーリンク
概要
- 論文の詳細を見る
Distributions of planktonic diatoms and particulate silicate and the sediment/water exchange of silicate in the south basin of Lake Biwa were examined with respect to the precipitation-redissolution cycle of silicate. The concentration of alkali-soluble particulate silicate in lake water correlated closely with the population density of diatoms. The average silicate content of a single cell of Aulacoseira granulata, the dominant species during the survey period, was estimated to be around 8 pmol⋅cell<SUP>-1</SUP>. The cellular silicon content decreased when the density of diatoms was high. The rate of silicate particularization by diatoms appeared to be limited by the nutrient (N, P) availability. The concentration of alkali-insoluble particulate silicate correlated well with the concentrations of particulate Ti and Al, indicating the terrestrial origin of this fraction. An incubation experiment using sedimented frustules with an intact sediment core of the south basin revealed that the frustule silicate was redissolved, presumably through feeding by benthic invertebrates. In contrast, regeneration of silicate from the intact north-basin sediment core was controlled by diffusion from the pore-water Si(OH)<SUB>4</SUB> pool. Compilation of our data and those obtained by the previous studies led to a conclusion that large centric diatoms such as Aulacoseira and Stephanodiscus were the important agents for both particularization of dissolved silicate and transportation of silicate to the sediment. However, the fraction by which the sedimented silicate was permanently incorporated in the sediment was presumed to be strongly affected by post-depositional processes.
- 日本陸水学会の論文
日本陸水学会 | 論文
- キイロカワカゲロウの孵化におよぼす水温の影響〔英文〕
- キイロカワカゲロウ羽化の経日・日周変化〔英文〕
- Studies on Taxonomy and Distribution of the Freshwater Snails,Genus,Semisulcospia in the Three Islands inside Lake Biwa
- びわ湖南湖におけるタテヒダカワニナおよびカゴメカワニナの分布とその決定要因について
- ちりとり型金綱による河川底生動物採集上の問題点