Phytoplankton heterogeneity in subtropical-semiarid reservoir with special reference to spring cyanobacterial bloom

Kassem, Doaa A.; El-Karim, Mohamad Saad Abd; El-Awamri, Ahmed A.; Saleh, Amal I.

doi:10.21608/egyjs.2020.132192

Cited by 3 publications

(5 citation statements)

References 38 publications

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“…In the current study, Microcystis was found to dominate during both the dry and rainy seasons. These findings support the observations by Kassem et al [34], in the Khor Ramla and Khor Abu-Simbel of Lake Nasser where more phytoplankton was reported in the dry season, with spring blooms of Microcystis. The observations of the current study corresponds to those of Kassem et al [34] under desert climate conditions, with spring blooms observed in both dams with higher numbers of cyanobacteria cells, compared to the other seasons.…”

Section: Discussionsupporting

confidence: 93%

“…The results of the current study are similar to other reports in the literature which justify the dominance of Microcystis in subtropical lakes with favorable water temperature and elevated nutrient levels caused by partially treated sewage and industrial effluent [1,22,34,57]. The dominance of cyanobacteria in the subtropical Lake Chivero, in Zimbabwe and Hartbeespoort Dam in South Africa, has previously been reported…”

Section: Discussionsupporting

confidence: 92%

“…Subtropical reservoirs, found in a desert climate like Lake Kinneret, Israel, were subjected to spring blooms of Peridium gatunense [33]. Lake Nasser, in southern Egypt and northern Sudan, situated in a desert climate, was found to be dominated by Microcystis in the spring months [22,34]. However, suspended Chla concentrations were higher in both the autumn and spring seasons [34].…”

Section: Introductionmentioning

confidence: 99%

“…Lake Nasser, in southern Egypt and northern Sudan, situated in a desert climate, was found to be dominated by Microcystis in the spring months [22,34]. However, suspended Chla concentrations were higher in both the autumn and spring seasons [34]. Karaoun Reservoir, Lebanon which is also located in a desert climate was found to be dominated by the bloom forming cyanobacteria Aphanizomenon in spring and autumn, and Microcystis in summer [23].…”

Section: Introductionmentioning

confidence: 99%

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The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production

Sirunda

Oberholster

Wolfaardt

et al. 2021

Water

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Toxic phytoplankton in the aquatic ecosystems are dynamic, affecting water quality. It remains unclear as to how possible toxic phytoplankton assemblages vary vertically and temporally in Swakoppoort and Von Bach dams, located in a dry subtropical desert region in central Namibia. The following variables were analyzed: pH, Secchi depths, turbidity, water temperature, total phosphorus, orthophosphate, chlorophyll-a, phytoplankton cells, and water depths. Cyanobacteria dominated the phytoplankton community in the autumn, winter and spring (dry) and summer (wet) seasons, at all the depth ranges in both dams. Microcystis dominated the vertical and temporal dynamics, followed by Dolichospermum. In the dry seasons, higher cyanobacteria cell numbers were observed in comparison to the rainy season in both dams. Spring blooms of cyanobacteria were evident in the Von Bach Dam while autumn and spring cyanobacteria blooms were observed in the Swakoppoort Dam. In the Swakoppoort Dam, the preferable depth ranges for toxic cyanobacteria species were at 5 to 10 m while in the Von Bach Dam at 0 to 5 m range. The findings of the current study indicate that the traditional selective withdrawal of water in the two dams should be performed with vertical and temporal dynamics of possible toxic cyanobacteria accounted for to aid the abstraction of water with the lowest possible toxic phytoplankton numbers, which could lower the public health risk.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production

Sirunda

Oberholster

Wolfaardt

et al. 2021

Water

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“…In Egypt, there has been a plethora of floristic and taxonomic studies conducted to explore and characterize the diverse freshwater cyanoprokaryotic and algal assemblages, including diatoms, from different biotopes across the country (e.g., Foged, 1980;Shaaban, 1994;El-Awamri et al, 1996;Hamed, 2005Hamed, , 2008Shanab, 2006;Mansour et al, 2015;Khairy et al, 2017;El-Sheekh et al, 2018;Saber et al, 2018a;Kassem et al, 2020 and the references therein). Species identifications Egypt.…”

Section: Introductionmentioning

confidence: 99%

Taxonomic and Ecological Observations on Some Algal and Cyanobacterial Morphospecies New for or Rarely Recorded in Either Egypt or Africa

et al. 2020

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T HE UNDERSTANDING of the diversity and spatial distribution of cyanoprokaryotes and algae in Egypt is challenging because this is still an understudied topic. To address this knowledge gap, we discuss morphotaxonomic features and ecological preferences for ten cyanobacterial and algal morphospecies from diverse Egyptian biotopes. Morphospecies were studied and identified using state-of-the-art and fine-grained taxonomy based on light and scanning electron microscope observations. Of these taxa, the cyanoprokaryotes Lemmermanniella uliginosa and Scytonema myochrous, the freshwater diatoms Cyclotella meduanae, Cavinula lapidosa, and Craticula subminuscula, the unicellular chrysophyte Mallomonas crassisquama, and the worldwide rarely-recorded zygnematalean streptophyte Hallasia cf. reticulata are designated as new records for Egypt. Moreover, the latter and L. uliginosa are as well first records for the whole African continent. Worthy of note, the freshwater diatoms Cyclostephanos invisitatus, Encyonema neomesianum, and Gomphonema laticollum have been rarely observed in previous Egyptian studies. Overall, most taxa identified tolerate increased nutrient concentrations (mesoeutraphentic and eutraphentic species), reflecting different human impacts on the biotopes they colonize. These newly recorded taxa are supposed to have been mostly overlooked in the previous Egyptian studies due to their relatively isolated habitats, small size, or complex taxonomic and nomenclatural history. More interesting algal and cyanobacterial taxa are still hidden and not yet discovered in Egypt, particularly in the little-explored and isolated desert habitats, and further research, using integrated polyphasic approaches, is therefore indispensable to achieve a better estimate of the Egyptian cyanobacterial and algal diversity, and to set up efficient algae-based assessment systems tailored for the Egyptian habitats.

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Microbial ecosystem and climate changes in the African lakes, the Case of Lake Nasser

Rabeh¹

2023

Lakes of Africa

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Phytoplankton heterogeneity in subtropical-semiarid reservoir with special reference to spring cyanobacterial bloom

Cited by 3 publications

References 38 publications

The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production

The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production

Taxonomic and Ecological Observations on Some Algal and Cyanobacterial Morphospecies New for or Rarely Recorded in Either Egypt or Africa

Microbial ecosystem and climate changes in the African lakes, the Case of Lake Nasser

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