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首页> 外文期刊>Turkish Journal of Fisheries & Aquatic Sciences >Surface Microplankton Composition at a Hyper Saline Oligotrophic Environment of Bitter Lake on the Suez Canal, Egypt
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Surface Microplankton Composition at a Hyper Saline Oligotrophic Environment of Bitter Lake on the Suez Canal, Egypt

机译:埃及苏伊士运河上盐湖高盐低营养环境中的表面微浮游植物组成

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摘要

The Bitter Lake is the central and most important water body of the Suez Canal as it contains 85% of the water of the canal system. This study reports the microplankton found occurring in the surface water of the Bitter Lake at monthly intervals from November 2008 until November 2009. A total of 130 taxa were identified, among which 67 taxa were of Bacillariophyceae, 15 Dinophyceae, 11 Chlorophyceae, 11 Cyanophyceae, 1 Euglenophyceae, 18 Tintinnidae, 4 Foraminiferidae, as well as 3 of Rotifera. Species diversity, numerical abundances and dynamics were analyzed for each taxon at three sites inside the Bitter Lake. At each of these sites Bacillariophyceae were predominant in the standing crop forming 67.2% of the total microplankton community with an average of 11,594 ind. L-1. The Dinophyceae occupied the second rank constituting about 16.5% of the total microplankton. Increase of microplankton abundance started in spring with maximum values being attained in late summer and early autumn (August ), with an average of 37,498 ind. L-1, while January was characterized by the lowest density (9,251 ind. L-1). Relatively higher diversity values were recorded at the northern part of the lake and a progressive decline in diversity was observed southward. Nutrient concentrations in the lake waters were very low, with silicate varying between 0.52-1.34 μM, phosphate between 0.14 and 0.55 μM and nitrate between 0.82-3.16 μmol L-1. Moreover, chlorophyll a fluctuated between 0.4 and 0.89 μg L-1. Data from microplankton analyses, nutrient (P) and chlorophyll a concentrations and transparency measurements were used to assess the ecosystem health of the Bitter Lake according to OECD, Canadian, and Quebec classification criteria, and it is concluded that the Bitter Lake be classified as an ultraoligotrophic lake.
机译:苦水湖是苏伊士运河的中央和最重要的水域,因为它含有运河系统中85%的水。这项研究报告了从2008年11月至2009年11月每月在苦湖地表水中发现的微浮游生物。共鉴定出130个分类单元,其中有67个分类为杆菌科,15个恐龙科,11个绿藻科,11个蓝藻科, 1个裸藻科,18个丁香科,4个有孔虫科以及3个轮虫科。在苦湖内的三个地点,对每个分类单元的物种多样性,数量丰度和动力学进行了分析。在这些地点中的每个地点,芽孢杆菌科都占主导地位,占微型浮游生物总群落的67.2%,平均工业年为11,594。 L-1。恐龙科排在第二位,约占总浮游生物的16.5%。春季微浮游植物的丰度开始增加,夏末和秋初(8月)达到最大值,平均为37,498 ind。 L-1,而一月份的特征是最低的密度(9,251 ind。L-1)。在湖的北部记录到相对较高的多样性值,向南观察到多样性逐渐下降。湖泊水域中的养分浓度非常低,硅酸盐的变化范围为0.52-1.34μM,磷酸盐的变化范围为0.14至0.55μM,硝酸盐的变化范围为0.82-3.16μmolL-1。此外,叶绿素a在0.4至0.89μgL-1之间波动。根据经合组织,加拿大和魁北克的分类标准,使用了来自浮游生物分析,养分(P)和叶绿素a浓度以及透明度测量的数据来评估苦湖的生态系统健康,得出的结论是,苦湖被归类为超营养湖。

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