Hydrobiological Study of Algae of an Urban Freshwater River

Jafari, N. G.; Gunale, VR

doi:10.4314/jasem.v10i2.43697

Cited by 24 publications

(16 citation statements)

References 4 publications

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“…However, Palmer (1969) has shown that Stigeoclonium and other genera, which are recorded during this study like Oscillatoria, Euglena, Scenedesmus, Chlamydomonas, Navicula, Nitzschia and Ankistrodesmus are the species found in organically polluted waters. These results are supported by Jafari and Gunale (2006). In the present study, Chroccoccus sp.…”

Section: Discussionsupporting

confidence: 90%

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: Discussionsupporting

confidence: 90%

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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“…A similar algae-sediment mat was observed on boulders and cobbles in a forested river in Borneo that was polluted by sediment and Mn from mining activities (Yule et al 2010). Cyanobacteria can be indicators of N pollution, and some species produce neurotoxins and hepatotoxins that have negative effects on stream organisms, and particularly on small macroinvertebrates (Jafari andGunale 2006, Sen et al 2013). In temperate streams, urbanization can have varied effects on algae.…”

Section: Discussionmentioning

confidence: 91%

Urbanization affects food webs and leaf-litter decomposition in a tropical stream in Malaysia

et al. 2015

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Urbanization is occurring rapidly in southeastern Asia where streams are increasingly pressured. We assessed the ecological integrity of Ampang River in Kuala Lumpur by comparing structural and functional measures between forested and urban sites. We assessed 4 forested, 1 intermediate (deforested, not channelized), and 5 urban, channelized sites. Urbanization altered substrate (concrete at urban sites), riparian vegetation, light, temperature, O 2 , conductivity, nutrients, and major ion levels, and simplified food webs. Invertebrate composition shifted from pollution-intolerant taxa at forested sites to tolerant taxa at urban sites. Richness in Surber samples was 56 species at forested sites and 27 taxa at urban sites. Basal food sources at forested sites were leaf litter and biofilm, whereas at urban sites they were a sediment mat comprising organic matter, cyanobacteria, iron bacteria, and algae. Organic matter biomass on ceramic tiles was greater at urban than forested sites, but chlorophyll a was not. Faunal abundance was greater in litter bags at urban (mean = 72.6 animals/bag, 68% chironomids) than at forested sites (27.9 animals/bag; 33% chironomids), but species richness was higher in forested sites. Food webs at forested sites were more complex and differed from those at urban sites, which lacked shredders, and grazers differed in taxonomic composition and diet between urban and forested sites. At forested sites, insect larvae grazed biofilm, whereas at urban sites, snails consumed the organic mat. Leaf decomposition was fastest at the most disturbed site indicating rapid microbial decomposition caused by increased temperatures (+4.5°C) and nutrients, and possibly increased physical breakdown caused by rapid flow carrying abrasive sediment and garbage. Urbanization has had severe impacts on ecosystem function in Ampang River that could be alleviated by preventing pollution, restoring riparian vegetation, and providing natural substrate.

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“…In agreement with Li et al (2009), unicellular algae are suitable bioindicators of water toxicity due to their short life cycle, sensitivity, and simple genetic materials in comparison to higher plants. In addition, algae are the primary producers in the food web and any change at its level will result in effects at the higher trophic levels (Joubert 1980;Jafari and Gunale 2006). Lanciotti et al (2004) found that, in comparison to crustaceans (Daphnia magna) and bioluminescent bacteria (Vibrio fischeri), the green alga Pseudokirchneriella subcapitata was the most sensitive organism toward wastewaters effluents from a textile plant.…”

Section: Discussionmentioning

confidence: 98%

Monitoring of Waste Water Samples Using the ECOTOX Biosystem and the Flagellate Alga Euglena gracilis

Ahmed

Häder²

2010

Water Air Soil Pollut

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In this study, a fast bioassay using the ECOTOX system to evaluate biological safety of waste water samples from different sources was performed. This biological system works full automatically to test water quality. The system uses the image analysis of movement behavior of the flagellate Euglena gracilis as a model organism. The measured parameters are cell motility, velocity, orientation (r-value, upward swimming and alignment) as well as cell form (compactness). In most tested waste samples, precision of orientation (r-value) is inhibited at concentrations which showed less effect on the other parameters. Motility and compactness were noticed to be the least inhibited parameters in response to waste water samples. The results of waste treatment plants revealed the efficiency of the used purification system. Movement as well as orientation parameters in E. gracilis showed high sensitivity toward chlorine. The order of sensitivity was motility>velocity> r-value>upward swimming with EC 50 values of 0.69, 0.81, 0.85, and 1.78 mgL −1 , respectively. ECOTOX with its test organism (E. gracilis) provides an automatic, fast and sensitive system to monitor water samples.

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Hydrobiological Study of Algae of an Urban Freshwater River

Cited by 24 publications

References 4 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

Urbanization affects food webs and leaf-litter decomposition in a tropical stream in Malaysia

Monitoring of Waste Water Samples Using the ECOTOX Biosystem and the Flagellate Alga Euglena gracilis

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