Species composition and diversity of epiphytic microalgae on Myriophyllum spicatum in the El-Ibrahimia Canal, Egypt

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY African Journal of Aquatic Science Pub Date : 2021-05-14 DOI:10.2989/16085914.2021.1884523
E. I. Abdel-Aal
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引用次数: 2

Abstract

The El-Ibrahimia Canal is one of the main irrigation sources in Egypt, that it supplies perennial irrigation to approximately 600 000 ha (one-fourth of the Egyptian cultivated land). An annual study on species composition of microalgae attached to the submerged hydrophyte Myriophyllum spicatum L. was carried out from midautumn 2016 to midsummer 2017. Epiphytic microalgae were represented by 109 species related to 66 genera. Diatoms were the most abundant group (66–95%) followed by green algae (3.3–25%). Aulacoseira granulata, Cyclotella ocellata, Cymbella affinis, Gomphonema parvulum, Navicula cuspidata, Navicula muralis, Nitzschia dissipata, Nitzschia hungerica, Staurosirella leptostauron, and Ulnaria ulna were the most dominant species. Regarding morphology-based functional groups (MBFGs) taxonomic approach, the epiphytic microalgae species were represented by six MBFGs (I, III, IV, V, VI and VII). The MBFG VI (mainly diatoms) was the leading group with a minimum average percentage of 59.9% during the summer season and a maximum of 95.06% during the winter season. The mean annual values of cell density fluctuated greatly between 8.6 × 106 (during the spring season) and 4.7 × 107 cells g−1 plant wet weight (during winter season). The changes in microalgae biovolumes have the same trend as cell density, with mean seasonal values of 3.89 × 109, 2.56 × 1010, 1.16 × 109, and 3.21 × 109 µm3 g−1 plant wet weight during autumn, winter, spring and summer seasons, respectively. Diversity index values ranged between 2.0 and 3.0, revealing a light pollution status of the canal. In general, the species composition and diversity of epiphytic algae along the El-Ibrahimia Canal are highly dependent on site and the physico-chemical properties of canal water affected by agricultural practice around it.
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埃及El-Ibrahimia运河尖狐尾藻附生微藻的种类组成和多样性
El Ibrahimia运河是埃及的主要灌溉来源之一,为大约60万公顷(埃及耕地的四分之一)提供常年灌溉。从2016年仲秋到2017年仲夏,对沉水植物肉藻微藻的物种组成进行了年度研究。表生微藻共有66属109种。硅藻是最丰富的类群(66–95%),其次是绿藻(3.3–25%)。颗粒Aulacoseira granulata、ocellata Cyclotella、亲缘Cymbella affinis、细小Gomphonea parvulum、尖脊藻Navicula cuspidata、村脊藻Navimula muralis、耗散Nitzchia、匈牙利Nitzchiahungerica、细尾星藻Staurosirella leptostauron和尺骨Ulnaria是最具优势的物种。关于基于形态学的官能团(MBFGs)分类方法,附生微藻物种由六个MBFGs(I、III、IV、V、VI和VII)代表。MBFG VI(主要是硅藻)在夏季的平均百分比最低为59.9%,在冬季的平均百分比最高为95.06%。细胞密度的年平均值在8.6×106(春季)和4.7×107细胞g−1(冬季)之间波动很大。微藻生物量的变化趋势与细胞密度相同,秋季、冬季、春季和夏季的平均季节值分别为3.89×109、2.56×1010、1.16×109和3.21×109µm3 g−1植物湿重。多样性指数值在2.0至3.0之间,表明运河处于轻度污染状态。总的来说,El Ibrahimia运河沿岸附生藻类的物种组成和多样性在很大程度上取决于现场及其周围农业实践影响的运河水的物理化学性质。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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