Seasonal patterns in phytoplankton growth, composition, and predominance in relation to water quality at Northwest El-Manzala Lake, Egypt

The physicochemical properties and phytoplankton community structure were investigated seasonally at four stations representing Northwest El-Manzala Lake, Egypt, during 2019. Results indicated wide local and seasonal variations in the concentrations of various physicochemical parameters. There was a...

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Veröffentlicht in:Water science & technology. Water supply 2020-12, Vol.20 (8), p.3341-3357
Hauptverfasser: Deyab, Mohamed, Abu Ahmed, Seham, Ward, Fatma
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Ward, Fatma
description The physicochemical properties and phytoplankton community structure were investigated seasonally at four stations representing Northwest El-Manzala Lake, Egypt, during 2019. Results indicated wide local and seasonal variations in the concentrations of various physicochemical parameters. There was a noticeable variation in levels of nitrogen and phosphorus forms; higher ammonia, nitrite, and nitrate contents of 11.6 (in autumn), 2.28 (in winter), and 2.32 mg L-1 (in autumn), respectively, were detected at Shatt Greba (site IV). Total-P and ortho-P exhibited higher levels of 7.14 and 0.96 mg L-1, respectively, at site IV in summer. The greatest amounts of sodium, potassium, calcium, barium, and lithium were 102.88 g L-1, 9.12 g L-1, 8.56 g L-1, 345.8 mg L-1, and 1.62 mg L-1, respectively, during summer. Two-way ANOVA presented a highly significant local and seasonal effect of physicochemical parameters on phytoplankton biomass. There were high levels of autumn algal biomass (65.96 mg L-1) and low levels of winter algal biomass (32.28 mg L-1). Cyanophyta, Chlorophyta, and Pyrrophyta dominated in the autumn, whereas Bacillariophyta dominated in the winter. Cyanophyta and Pyrrophyta biomass showed high local variations in contrast to Bacillariophyta and Chlorophyta. The species diversity index revealed that the study area was mildly to moderately polluted water.
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Water supply</title><addtitle>WATER SUPPLY</addtitle><description>The physicochemical properties and phytoplankton community structure were investigated seasonally at four stations representing Northwest El-Manzala Lake, Egypt, during 2019. Results indicated wide local and seasonal variations in the concentrations of various physicochemical parameters. There was a noticeable variation in levels of nitrogen and phosphorus forms; higher ammonia, nitrite, and nitrate contents of 11.6 (in autumn), 2.28 (in winter), and 2.32 mg L-1 (in autumn), respectively, were detected at Shatt Greba (site IV). Total-P and ortho-P exhibited higher levels of 7.14 and 0.96 mg L-1, respectively, at site IV in summer. The greatest amounts of sodium, potassium, calcium, barium, and lithium were 102.88 g L-1, 9.12 g L-1, 8.56 g L-1, 345.8 mg L-1, and 1.62 mg L-1, respectively, during summer. 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subjects Algae
Alkalinity
Ammonia
Aquatic ecosystems
Autumn
Bacillariophyta
Barium
Biodiversity
Biomass
Calcium
Chlorophyta
Community structure
Cyanobacteria
Cyanophyta
Engineering
Engineering, Environmental
Environmental Sciences
Environmental Sciences & Ecology
Lakes
Life Sciences & Biomedicine
Lithium
Parameters
Phosphorus
Physical Sciences
Physicochemical processes
Physicochemical properties
Phytoplankton
Plankton
Potassium
Pyrrophyta
Salinity
Science & Technology
Seasonal variation
Seasonal variations
Seasons
Sodium
Species diversity
Summer
Technology
Variance analysis
Water pollution
Water quality
Water Resources
Winter
title Seasonal patterns in phytoplankton growth, composition, and predominance in relation to water quality at Northwest El-Manzala Lake, Egypt
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