Survey of distribution and diversity of blue-green algae (Cyanobacteria) in Egypt

Hamed, A. F.

doi:10.1556/abot.47.2005.1-2.11

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…2B). This is in accord with the study conducted by Hamed, 15 which documented the presence of M. aeruginosa and M. flos-aquae in the Nile Delta region. As far as we know, no previous study has documented the presence of M. wesenbergii in the Nile River.…”

Section: Discussionsupporting

confidence: 92%

“…These species were previously identified in Nile water samples. 15,32 However, none of those bands were identical in sequence to any band obtained from our AMT-domain DGGE gene analysis (Fig. 6), indicating that these strains are probably non-hepatotoxic.…”

Section: Identity and Distribution Of Potentially Hepatotoxic Cyanoba...mentioning

confidence: 80%

“…Toxin-producing cyanobacteria have been isolated from the southern part of the Nile in Egypt. [14][15][16] These previous studies have relied only on morphological analysis, isolation, and toxicity assays of the isolates; no molecular analysis of the genetic diversity has been undertaken until now.…”

Section: Introductionmentioning

confidence: 99%

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Diversity of hepatotoxic cyanobacteria in the Nile Delta, Egypt

Amer¹,

Dı́ez

El-Shehawy

2009

J. Environ. Monit.

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Optimized denaturing gradient gel electrophoresis (DGGE) fingerprinting and real-time PCR were performed to identify and quantify the potential hepatotoxic microcystin- and nodularin-producing cyanobacteria present in freshwater samples collected during different seasons at three different sites from the Nile River Delta. The combined use of molecular gene markers (targeting the aminotransferase domain of the hepatotoxin synthetase modules and the 16S rRNA gene) and light microscopy demonstrated the dominance of different freshwater Microcystis phylotypes, including the potential hepatotoxin producers M. wesenbergii and M. aeruginosa, several Synechococcus and Cyanobium phylotypes, as well as the presence of Nodularia spumigena and Cylindrospermopsis raciborskii in the samples "collected during summer 2006 and winter 2007". Certain seasonal changes (summer and winter) in Microcystis microdiversity were detected. Real-time PCR revealed no difference in the quantities of potential hepatotoxin-producing cyanobacterial communities between summer and winter, but did show differences between the three sampling sites investigated. The expression of the aminotransferase domain analyzed by DGGE fingerprinting demonstrated that all Microcystis phylotypes present in the samples might have been active at the time of the sampling. Statistical analysis showed a significant effect of TP, and not TN, on the relative abundance of the potentially hepatotoxic cyanobacterial community.

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Section: Discussionsupporting

confidence: 92%

Section: Identity and Distribution Of Potentially Hepatotoxic Cyanoba...mentioning

confidence: 80%

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Diversity of hepatotoxic cyanobacteria in the Nile Delta, Egypt

Amer¹,

Dı́ez

El-Shehawy

2009

J. Environ. Monit.

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“…2-The main elements of the flora are belonging to order Euglenales, followed by Desmidiales, Chlorococcales, Oscillatoriales, Naviculales, Chroococcales, Licmophoralers, Zygnematales, Cymbellales, and Chlorellales (Table 2). 3-Oscillatoriacea is considered as a dominanat family having the highest number of species during this study (Table 3); this result was in agreement with that found by Hamed (2005) that worked on distribution and diversity of blue-green algae (cyanobacteria) in Egypt. 4-Oscillatoria was the dominant genus, including 22 species (Tables 2-4).…”

Section: Results and Disscusionsupporting

confidence: 91%

Biodiversity of Algae from the Tajan River Basin (Mazandaran-Iran)

Ebadi¹,

Hisoriev²,

Ebadi³

2018

Egypt. J. of Aquatic Biolo. and Fish.

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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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Survey of distribution and diversity of blue-green algae (Cyanobacteria) in Egypt

Cited by 9 publications

References 13 publications

Diversity of hepatotoxic cyanobacteria in the Nile Delta, Egypt

Diversity of hepatotoxic cyanobacteria in the Nile Delta, Egypt

Biodiversity of Algae from the Tajan River Basin (Mazandaran-Iran)

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

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