Seasonal biodiversity and ecological studies on the epiphytic microalgae communities in polluted and unpolluted aquatic ecosystem at Assiut, Egypt

Adam, Mahmoud S.; Hifney, Awatief F.; Fawzy, Mustafa A.; Al-Badaani, Arwa A.

doi:10.1515/eje-2017-0017

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…This explanation is supported by the results of the present study which recorded water temperature of 29 and 21 Cº and Photic zone of 89 and 87cm in Summer and Spring, respectively. Other possible reasons can be related to day length and elevated levels of essential nutrient resulting from increase in the metabolism processes of the aquatic plants (30,31). These results agree with those of previous studies (32).…”

Section: Resultssupporting

confidence: 92%

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2019

Baghdad Sci.J

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The present research was performed to study the qualitative and quantitative composition of epiphytic algae on the aquatic host plant Ceratophyllum demersum L. Four sites in Tigris River, at Wassit Governorate were covered, during the seasons of Autumn 2017, winter 2018, Spring 2018, and Summer 2018. The study also included measuring the physiochemical parameters (temperature of air and water, pH , water level, EC, salinity, TDS, TSS, dissolved oxygen, BOD5, alkalinity, total hardness, calcium, magnesium, total nitrogen, total phosphourus). The total number of species of epiphytic algae was145 species, 98 species belonging to Bacillariophyceae, followed by 27species of class Cyanophyceae, 19 species of class Chlorophyceae, 4 species of class Euglenophyceae, and only 1 species for each of Chrycophyceae and Rhodophceae. The total number of epiphytic algae ranged from 1681×10 4 cell/gm in Winter to 2014.95×10 4 cell/gm in Spring. The range of biodiversity indices was (1-8.2) for Richness index, (1.5-3.2) for Shannon index and (0.3-0.65) for Evenness index.

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Section: Resultssupporting

confidence: 92%

Untitled

2019

Baghdad Sci.J

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“…The dbRDA analysis indicated that increasing Na, K, EC, phosphate, and sulphate had adverse effects on the diversity and species richness of the major phytoplankton groups. In general, the environmental disturbance in water nutrients may contribute additional impacts with numerous drivers that can adversely affect the phytoplankton over time [39]. The change in the EC level gives direct information on the total dissolved solids, electrolytes, and degree of pollution [40,41].…”

Section: Discussionmentioning

confidence: 99%

Environmental impacts of phenol pollution on phytoplankton biodiversity at Assiut region, Egypt

El-Naeb

Fawzy

Hifney

et al. 2022

Assiut University Journal of Multidisciplinary Scientific Resea

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Phenol is a common organic pollutant in the aquatic habitats. However, its adverse effects on the composition and diversity of phytoplankton are still poorly understood. Phenol can cause toxic effects to different living organisms even at low concentrations. The present study investigated the effect of phenol on phytoplankton diversity and community structure in samples collected from ten polluted sites. The concentration of phenol in the investigated sites were generally higher than 0.05 mg L −1 which is over the allowable limit. The spatial complexity of the microalgal community was investigated using different alpha (α) diversity measures for the largest microalgal groups (Cyanobacteria, Chlorophyta, Bacillariophyta). Distancebased redundancy analysis (dbRDA) indicated that phenol pollution had adverse effects on both phytoplankton diversity and taxonomic structure. Accordingly, the algal pollution index (API) was negatively correlated with richness and diversity of the main phytoplankton groups. The most tolerant species to phenol stress belong to Chlorophyta and Cyanobacteria. In addition, the total phytoplankton community was grouped into 19 functional groups (FGs) which associated with the preference of a certain environmental conditions. A laboratory toxicity experiment was also performed to identify the negative effects of short-term exposure to phenol on different microalgal species. Thus, the most sensitive taxa were disappeared in response to the phenol treatment. Overall, this study is valuable in indicating the adverse effects of phenol pollution to the natural phytoplankton community.Environmental impacts of phenol pollution on phytoplankton biodiversity at Assiut region, Egypt 334 Determination of sodium and potassiumSodium and potassium ion concentrations were determined using flame photometer (Flame Photometer M 71 D type Nr/ LPG075) [7]. Determination of calcium and magnesiumThe complexometric titration method [8] was employed for both calcium and magnesium determinations. For calcium determination, freshwater sample (1 mL) was diluted by 5 mL of distilled water and KOH solution (2 mL, 10% w/v). The mixture was titrated against Na 2 -EDTA (0.005 N) in the presence of muroxide as an indicator until a purple end point. The 0.005 N EDTA is equivalent to 0.1 mg of calcium. Similarly, for the determination of magnesium, freshwater sample (1 mL) was diluted by distilled water (5 mL) and titrated with Na 2 -EDTA (0.005 N) in the presence of Erichrome Black T as an indicator until a blue end point. The amount of EDTA consumed is equivalent to Ca 2+ plus Mg 2+ . The 0.005 N of EDTA is equivalent to 0.06 mg of magnesium. Determination of water chlorinityChlorinity was analyzed by the method of [9]. Water sample (1 mL) was mixed with 10 mL distilled water followed by adding 1 mL of K 2 Cr 2 O 7 (5% w/v) as indicator. The solution was titrated against AgNO 3 (0.05 N) until orange color appeared. Determination of nitrateNitrate was spectrophotometrically determined by chromotropic acid (1,8dihydroxynaphthal...

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“…In lake ecosystems, epiphytic communities constitute one of the basic elements in the food networks, and the productivity of epiphytic organisms may be equal to or even exceed the phytoplankton and macrophyte productivity ( [59] and the references therein). Interactions between benthic algae, phytoplankton and macrophytes can determine the nature of the entire ecosystem as well as the ecosystem responses to the changes in environmental conditions [60].…”

Section: Discussionmentioning

confidence: 99%

“…The main mechanisms in epiphyte-macrophyte interactions include the shading and reducing the nutrient diffusion from water to macrophytes and releasing allelopathic compounds by macrophytes to reduce the number of epiphytes [62]. However, the abundance of aquatic flora (including epiphytic algae and macrophytes) is influenced by many abiotic and biotic factors such as temperature, light, pH, nutrients, water level, seasonality, macrophyte morphology ( [59] and the references therein). Concerning the Egyptian water bodies, the information on epiphytic algal communities is very scarce [58,[63][64][65].…”

Section: Discussionmentioning

confidence: 99%

Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam

Goher

Napiórkowska‐Krzebietke

Aly

et al. 2021

Water

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This study focused on the monitoring and assessment of aquatic ecosystem functioning based on the abiotic and biotic features of Lake Nasser in the post-flood and pre-flood periods as the last ones before water storing behind the Grand Ethiopian Renaissance Dam. The physicochemical parameters, distribution and structure of biotic communities, including bacteria, phytoplankton, zooplankton, macrophytes, epiphytes and fish were analyzed at 15 sites. The values of most parameters (primarily temperature, total suspended solids, pH, orthophosphates, carbonates, sulphates and some cations) were higher in the pre-flood period, whereas higher values of conductivity, total dissolved solids, total solids, nitrites, nitrates, chemical oxygen demand, bicarbonates and chlorophyll a were recorded in the post-flood period. Cyanobacteria-dominated phytoplankton and total coliform bacteria were more abundant in the pre-flood period, and especially at sites 10–15, whereas higher abundances of zooplankton were recorded in the post-flood period. All these changes in parameters were significantly differentiated, and only the concentrations of dissolved oxygen, biochemical oxygen demand, ammonium and silicates were at similar level in both periods. The study also indicated that environmental factors had affected the macrophyte distribution and the adaptation of the invasive species Myriophyllum spicatum to thrive under different environmental factors in the lake. Besides, macrophytes provided the habitat to other aquatic organisms, especially epiphytes, and also helped maintaining the good water quality, nutrient cycling and stabilizing rivers’ and lakes’ banks. Generally, these conditions were rather favorable for biological processes and fish production.

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Seasonal biodiversity and ecological studies on the epiphytic microalgae communities in polluted and unpolluted aquatic ecosystem at Assiut, Egypt

Cited by 16 publications

References 28 publications

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Environmental impacts of phenol pollution on phytoplankton biodiversity at Assiut region, Egypt

Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam

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