Seasonal variations in phytoplankton and glycollate concentrations in the Menai Straits, Anglesey
Seasonal variations in phytoplankton and glycollate concentrations in the Menai Straits, Anglesey
复制标题
安格尔西梅奈海峡浮游植物和乙醇酸盐浓度的季节性变化
DOI：
10.1017/s0025315400017252
复制
发表时间：
1975
影响因子：
1.2
通讯作者：
G. E. Fogg
中科院分区：
文献类型：
--
作者：
R. H. Hasan;Aditipant S. J. Coughlan;G. E. Fogg
现在已经确定，自然浮游植物种群可以将光合作用中固定的大部分碳以溶解有机物的形式直接释放到外部介质中。乙醇酸可能是这种细胞外有机部分的重要组成部分，无论是在培养物中（Hellebust，1965）还是在自然环境中（Watt，1966）。然而，由于缺乏方便可靠的方法来确定乙醇酸盐在天然水中的浓度，因此很难研究乙醇酸盐在环境中的作用。然而，Shah & Fogg (1973) 和 Shah & Wright (1974) 开发了一种海水中乙醇酸盐分析的程序，该程序基于氧化铝的吸附和随后的洗脱，通过 Calkins 比色技术进行测定，该技术对于常规分析来说既灵敏又不太费力。 Fogg (1966)提出浮游植物分泌的乙醇酸作为细胞外储备，可用于在不利于光合作用的条件下生存。 Wright & Hobbie (1965) 表明，一些淡水细菌吸收乙醇酸的速度与吸收乙酸盐和葡萄糖的速度相同。因此，乙醇酸似乎在不同营养级之间的能量流动中发挥着重要作用。为了评估这些假设，确定天然水中乙醇酸盐的浓度和周转率似乎很重要。
It is now well established that natural phytoplankton populations may liberate a substantial proportion of the carbon fixed in photosynthesis directly into the external medium in the form of dissolved organic matter. Glycollate may be an important component of this extracellular organic fraction, both in culture (Hellebust, 1965) and in the natural environment (Watt, 1966). Nevertheless, it has been difficult to investigate the role of glycollate in the environment because of the lack of a convenient and reliable method for determining its concentration in natural waters. Shah & Fogg (1973) and Shah & Wright (1974), however, have developed a procedure for glycollate analysis in sea water, based on adsorption on to alumina and subsequent elution for determination by the Calkins colorimetric technique, which is both sensitive and not too laborious for routine analyses. Fogg (1966) suggested that glycollate excreted by phytoplankton acts as an extracellular reserve which may be utilized for survival under conditions unfavourable for photosynthesis. Wright & Hobbie (1965) showed that some fresh water bacteria take up glycollate at rates of the same order of magnitude as for acetate and glucose. Glycollate would therefore appear to be of importance in the energy flow between different trophic levels. In order to evaluate these hypotheses it seems important to determine the concentrations and turnover rates of glycollate occurring in natural waters.