Silicon consumption and population density changes of dominant planktonic diatoms in Lake Constance
Silicon consumption and population density changes of dominant planktonic diatoms in Lake Constance
复制标题
博登湖优势浮游硅藻的硅消耗量和种群密度变化
DOI：
--
复制
发表时间：
1983
期刊：
影响因子：
--
通讯作者：
H. Stabel
中科院分区：
文献类型：
--
作者：
U. Sommer;H. Stabel
(1)研究了康斯坦斯湖硅藻生长与硅浓度的相互作用，采用单位体积水的细胞数、体积和溶解的活性硅浓度等数据。(2) 1979年和1980年硅藻春、夏季生长期溶解活性硅浓度明显下降。(3)根据几种硅藻种类硅浓度的变化和种群密度的增加，计算出每个细胞和单位细胞体积的硅吸收量。硅与细胞的比值（mg / million cells）在很大的范围内变化，从0.005 （hantzschii）到0.72 (Synedra acus)，而单位细胞体积的硅（mg mm-3）在较窄的范围内变化，从0。山铁饼和龙花的平均值为0.10，山楂的平均值为0.36。(4)概述了一种可以计算硅藻种群生长率和损失率的四区模型。(5)硅浓度对生长和死亡影响的种间差异可以解释从台湾Asterionellaformosa夏季演替到Fragilaria crotonensis（1979年）或Stephanodiscus binderanus（1980年）。对于台湾星形虫来说，硅的耗尽并没有阻止细胞分裂，而是导致了大多数种群的死亡。当溶硅浓度再次升高后，花椒和石斛的细胞分裂停止，但细胞未死亡，种群继续增长
(1) Interactions between silicon concentration and diatom growth have been studied in Lake Constance with data on number and volume of cells per unit volume of water and concentration of dissolved reactive silicon. (2) Concentration of dissolved reactive silicon was found to decrease markedly during the spring and summer growth period of diatoms in 1979 and 1980. (3) Amounts of silicon taken up per cell and per unit cell volume have been calculated from the changes in silicon concentration and the increases in population density for several diatom species. The silicon to cell quotient (mg per million cells) varied over a wide range from 0.005 for Stephanodiscus hantzschii to 0.72 for Synedra acus, while that of silicon per unit cell volume (mg mm-3) varied over a narrower range from 0. 10 for Stephanodiscus hantzschii and Fragilaria crotonesis to 0.36 for Synedra acus. (4) A four-compartment model, that allows estimates of the rates of growth and of loss of diatom populations to be calculated, is outlined. (5) Summer succession from Asterionellaformosa to either Fragilaria crotonensis (in 1979) or Stephanodiscus binderanus (in 1980) is explained by interspecific differences in the effects of silicon concentration on growth and death. For Asterionellaformosa, silicon depletion did not stop cell-division but led to the death of most of the population. For Fragilaria crotonensis and Stephanodiscus binderanus cell division stopped but cells did not die and population growth continued after the concentration of dissolved silicon had increased again