Microcystin production in benthic mats of cyanobacteria in the Nile River and irrigation canals, Egypt

Mohamed, Zainal Abidin; El-Sharouny, H. M.; Ali, Wafaa

doi:10.1016/j.toxicon.2006.01.029

Cited by 109 publications

(64 citation statements)

References 36 publications

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“…The other species were recently included in the list of harmful algae over the world Phormidium tenue (Mohamed et al, 2006), Odontella auriata, Proboscia alalta, Thalassionema nitzschoides, Neoceratium furca, Neoceratium fusus (Özman-Say and Balkis, 2012) and finally, Thalassiosira aestivalis (Yao et al, 2006). Although, they all contributed by a very low count to the main bulk, except Oscillatoria limosa, Ocillatoria tenuis and Planktothrix aghardhii, their occurrence as epiphytic or even planctonic forms threatened the Eastern Harbor and may have a drastic effects on biota.…”

Section: Discussionmentioning

confidence: 99%

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

El-Din¹,

Shaltout²,

Nassar³

et al. 2015

American Journal of Environmental Sciences

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Abstract:A qualitative and quantitative study on the epiphytic microalgae and epiphytic zooplankton were conducted in order to follow up their community structures on seaweeds in relation to some physicochemical variables in the coastal waters of the Eastern Harbor of Alexandria. Water and macroalgal samples were collected seasonally during two years successively: Winter, summer, autumn (2012) and spring (2013). The collected seaweeds were Ulva fasciata (green alga), Corallina mediterranea, Corallina officinalis, Gelidium sp., Pterocladiella capillacea, Hypnea musciformis and Grateloupia doryphora (red algae). The studied water quality parameters were pH, salinity, dissolved oxygen, oxidizable organic matter and nutrient salts. The abundance of epiphytes were significantly different between morphotypes (two-way ANOVA), p≤0.05; ranking the branched thalli as the first preference for microalgal epihytes, sheet-like thalli with a smooth surface as the second one, while the lowest rank was for the mucilaginous species. The same result was found for epiphytic zooplankton. The results of the statistics revealed insignificant seasonal variations in the epiphytic microalgae and very weak correlations between the abundance of microalgae and the physico-chemical parameters. In contrast, there were significant differences for epiphytic zooplanktonic seasonal variations. Whereas, the zooplankton count was correlated preferably with environmental water salinity, followed by nutrients.

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Section: Discussionmentioning

confidence: 99%

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

El-Din¹,

Shaltout²,

Nassar³

et al. 2015

American Journal of Environmental Sciences

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“…Several toxic species of cyanobacteria (Anabaena subcylindrica, A. variabiles, Calothrix parietina, Nostoc spongiaeforme, Plectonema boryanum, Phormidium corium and P. tenue) were isolated from mats in the Nile River and in irrigation canals, producing MCs [37]. Sediments in Nile River and irrigation canals were also found to be contaminated by M. aeruginosa and MCs, suggesting a risk for the benthic fauna [38].…”

Section: Benthic Cyanobacteriamentioning

confidence: 99%

Emerging health issues of cyanobacterial blooms

Manganelli

Scardala

Stefanelli

et al. 2012

Annali Dell'Istituto Superiore Di Sanità

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Abstract. This paper describes emerging issue related to cyanobacterial dynamics and toxicity and human health risks. Data show an increasing cyanobacteria expansion and dominance in many environments. However there are still few information on the toxic species fitness, or on the effects of specific drivers on toxin production. Open research fields are related to new exposure scenario (cyanotoxins in water used for haemodialysis and in food supplements); to new patterns of co-exposure between cyanotoxins and algal toxins and/or anthropogenic chemicals; to dynamics affecting toxicity and production of different cyanotoxin variants under environmental stress; to the accumulation of cyanotoxins in the food web. In addition, many data gaps exist in the characterization of the toxicological profiles, especially about long term effects.

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“…The aqueous supernatant (Lincoln et al, 1996) as well as the methanol extract (Hrouzek et al, 2005) of another cyanobacterium, Calothrix parietina, also did not cause any mortality in Artemia nauplii. In contrast, Mohamed et al (2006) reported toxic effects of Calothrix parietina, which was isolated from benthic mats, on Artemia salina. Therefore, to reduce the risk of developing harmful organisms in naturally developing periphyton, mats can be developed with selected species of cyanobacteria.…”

Section: Discussionmentioning

confidence: 97%

Immobilized periphytic cyanobacteria for removal of nitrogenouscompounds and phosphorus from shrimp farm wastewater

Banerjee¹,

Khatoon²,

Shariff³

et al. 2015

Turk J Biol

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IntroductionAquaculture has grown rapidly over the last couple of decades due to significant increases in the demand for fish and seafood throughout the world. This intense development has resulted in the generation of large quantities of wastewater, which includes dissolved inorganic nitrogen and phosphorus (Kamilya et al., 2006). Nitrogenous compounds and phosphorus are major contaminants in aquaculture wastewater and their release into surrounding water bodies can cause eutrophication (Kamilya et al., 2006). It is imperative that this wastewater be treated by employing environmentally friendly and cost-effective methods.A number of techniques have been developed to control nitrogenous substances in aquaculture systems (Yusoff et al., 2011;Devaraja et al., 2013). Some of these processes tend to be either highly sophisticated or extremely complicated and expensive (Hoffmann, 1998). Several authors have demonstrated the use of cyanobacteria in treating wastewater from dairy (Boominathan and Manoharan, 2008), dye (Vijayakumar et al., 2005), and sewage (Manoharan and Subramanian, 1992), indicating that it may be a feasible option. This may be due to the fact that cyanobacteria have simple growth requirements and do not need energy-rich compounds like other nonphotosynthetic microorganisms. In addition, many cyanobacteria combine photosynthesis and nitrogen fixation, which is an advantage over other eukaryotic photosynthetic organisms (Vijayakumar, 2012).Most wastewater treatments describe microalgae growing in suspension, and there are reports of planktonic microalgae being used for removal of nitrogenous compounds from wastewater (Shelknanloymilan et al., 2012;Sriram and Seenivasan, 2012). However, one of the major limitations of this technology is the difficulty encountered in separating suspended biomass from the treated water discharge. As such, there has been an increased interest in using immobilized cyanobacteria to Abstract: Cyanobacteria can be used to remove nitrogenous compounds from wastewater, but a major bottleneck in the process is the separation of cyanobacterial biomass from the treated water discharge, which may cause eutrophication. The current study assessed the suitability of three periphytic cyanobacteria (Geitlerinema sp., Gloeotrichia sp., and Lyngbya sp.) isolated from shrimp ponds. These cyanobacteria were immobilized by self-adhesion to polyvinyl chloride sheets, forming mats, and were screened for their efficacy to reduce nitrogenous compounds and phosphorus. Among the three isolates, Geitlerinema sp. showed the highest reduction rate (98%) and was further tested using shrimp pond wastewater. The results showed that initial wastewater concentrations (mg L -1 ) of total ammonia nitrogen (5.0), nitrite nitrogen (2.9), and soluble reactive phosphorus (2.5) were significantly (P < 0.05) reduced within 7 days in tanks containing wastewater + Geitlerinema sp. mats (0.1, 0.2, and 0.8) compared to wastewater + substrate only (4.3, 2.7, and 2.3) or wastewater only (4.4, 2.8, and 2.4). In addition...

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Microcystin production in benthic mats of cyanobacteria in the Nile River and irrigation canals, Egypt

Cited by 109 publications

References 36 publications

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

Emerging health issues of cyanobacterial blooms

Immobilized periphytic cyanobacteria for removal of nitrogenouscompounds and phosphorus from shrimp farm wastewater

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