X-Ray Microanalytical Study of the Protozoan Ceratium Hirundinella From Rostherne Mere (Cheshire, Uk): Dynamics of Intracellular Elemental Concentrations, Correlations and Implications for Overall Ecosystem Functioning
X-Ray Microanalytical Study of the Protozoan Ceratium Hirundinella From Rostherne Mere (Cheshire, Uk): Dynamics of Intracellular Elemental Concentrations, Correlations and Implications for Overall Ecosystem Functioning
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来自 Rostherne Mere（英国柴郡）的原生动物 Ceratium Hirundinella 的 X 射线微分析研究：细胞内元素浓度的动态、相关性和对整体生态系统功能的影响
DOI：
10.1163/156854299x00182
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
E. Bellinger
中科院分区：
文献类型：
--
作者：
D. Sigee;V. Krivtsov;C. Tien;E. Bellinger
采用传统的湖沼学方法和X射线微区分析方法，对淡水湖泊中的角藻种群进行了研究。细胞内元素浓度的相关性和因子分析揭示了一个明确的模式，主要由三个因素，与K，P和Mg表现出较高的负荷上的第一，Ca和Si的第二，和S，Cl和Na的第三个因素的统计关系。S与K、P也呈显著相关，属于第一组合。统计分析的结果总结在细胞内元素协会的结构模型。考虑后者的营养吸收和浮游生物种群动态的数学描述中，应证明是有用的水生建模。人口的发展导致了显着减少透明度和营养盐浓度的上层水。记录的人口峰值与最低水平的环境PO4.P和DIN和最大的细胞内水平的一些重要的化学物质（镁，钾，磷，硫）。正磷酸盐的表层浓度的减少并不匹配的同时增加的总P量内的人口角藻。因此，环境养分短缺，可以减轻角藻的垂直运动，异养消耗有机物质和/或部分夹带的低层水在寒冷的天气期间的能力。随着种群的死亡，细胞内积累的化学物质从上层被去除，容易沉积的生物质。结果清楚地表明，角藻在不同层次之间的Rostherne生态系统的营养物质转化的重要性。考虑到高湖水滞留时间，角藻的生态化学和人口动态的地球化学后果可能会大大延迟污水分流后预期的湖泊营养状态的变化。
The population of Ceratium hirundinella in a freshwater lake was studied both by traditional limnological methods and X-ray microanalysis during the final phase of stratification. Correlation and Factor analysis of intracellular elemental concentrations revealed a clear pattern of statistical relationships mainly determined by three factors, with K, P and Mg demonstrating higher loadings on the first, Ca and Si on the second, and S, Cl and Na on the third factor. S also showed significant correlations with K and P, elements belonging to the first association. The results of the statistical analysis are summarised in a structural model of intracellular elemental associations. Consideration of the latter in the mathematical description of nutrient uptake and plankton population dynamics should prove useful in aquatic modelling. Development of the population resulted in a dramatic decrease in transparency and nutrient concentrations in the epilimnion water. The recorded peak of the population coincided with minimum levels of ambient PO4.P and DIN and maximum intracellular levels of a number of important chemicals (Mg, K, P, S). The decrease in the epilimnion concentrations of orthophosphate did not match the simultaneous increase in the total amount of P contained within the population of Ceratium. Ambient nutrient scarcity, therefore, could have been alleviated by Ceratium's capacity for vertical movements, heterotrophic consumption of organic materials and/or partial entrainment of the hypolimnion water during periods of colder weather. Following the demise of the population, chemicals accumulated inside the cells were removed from the epilimnion with easily sedimented biomass. The results clearly showed the importance of Ceratium in transforming nutrients between different levels of the Rostherne ecosystem. Considering the high lake water retention time, the geochemical consequences of Ceratium's ecochemistry and population dynamics may considerably delay changes in the lake's trophic status expected after sewage diversion.