scholarly journals Potential impact of some abiotic parameters on a phytoplankton community in a confined bay of the Eastern Mediterranean Sea: Eastern Harbour of Alexandria, Egypt

2007 ◽  
Vol 8 (2) ◽  
pp. 49 ◽  
Author(s):  
A.M. ABDEL-HALIM ◽  
H.M. KHAIRY
Keyword(s):  
Phytoplankton Community ◽  
Eastern Mediterranean ◽  
Water Layer ◽  
Average Density ◽  
Stepwise Multiple Regression ◽  
Nutrient Concentrations ◽  
Regression Equations ◽  
Chemical Parameters ◽  
Open Sea ◽  
Physico Chemical

The Eastern Harbour (E.H.) is sheltered from the sea by a breakwater with two main entrances through which exchange with the netitic Mediterranean water takes place. Some physico-chemical parameters of the study area showed that dissolved oxygen ranged from 6.57 to 11.4 mg l-1 at the open sea station and 5.08 to 11.71 mg l-1 for the E.H. stations. Higher nutrient concentrations were recorded in the E.H. than that at the open sea station, except for ammonia and nitrate. The phytoplankton flora of the E. H. stations was much richer in species than the adjacent open sea station, attaining 96 and 74 species, respectively. As well as the average phytoplankton density, it was higher in the surface water than near the bottom water layer. With regard to the total phytoplankton community, Bacillariophyceae dominated at all sites, whereas Dinophyceae, Chlorophyceae, Cyanophyceae and Euglenophyceae were rarely recorded. The highest average density of phytoplankton abundance was recorded during March, both at the surface. Correlation coefficient of biological factors with some physico-chemical parameters and a series of stepwise multiple regression equations describing the dependence of phytoplankton density on the changes of most abiotic prevailing conditions are provided and discussed.

scholarly journals Diversity of Phytoplankton and Pollution Tolerant Species of Navule Pond, Shivamogga, Karnataka

2016 ◽  
Vol 15 (4) ◽  
pp. 35-47
Author(s):  
Nafeesa Begum ◽  
H M Ashashree ◽  
H A Sayeswara
Keyword(s):  
Phytoplankton Community ◽  
Winter Season ◽  
Summer Season ◽  
Major Group ◽  
Chemical Parameters ◽  
Phytoplankton Population ◽  
Tolerant Species ◽  
Physico Chemical ◽  
Anabaena Sp

The present study deals with phytoplankton population of Navule pond in Shivamogga during September 2014 to August 2015. Blue-greens constituted the major group (41.75%) followed by Chlorococcalas (36.68%), Diatoms (13.36%), euglenoids (7.35%) and Desmids (0.86%). The phytoplankton community was composed of 11 species of Blue-greens, 20 species of Chlorococcales, 18 species of Diatoms, 11 species of Euglenoids and 08 species of Desmids. Each group of phytoplankton showed different peak periods, the summer season produces relatively more phytoplankton than rainy and winter season. The variations in physico-chemical parameters are responsible for the fluctuation of quantity of phytoplankton.  The dominant genera recorded on the pond were Anabaenopsis sp., Ocillatoria sp., Euglena sp., and Phacus. Some of the pollution tolerant species identified during the present study are Scenedesmusquadricauda, Coelastrum sp., Tetraedonmuticum, Ocillatoria sp., Phormidium sp., Microcystis sp., Anabaena sp., Navicula sp., Synedra ulna, Cyclotella sp., and Pinnularia sp. In the present study Microcystisaeroginosa was recorded indicates the civic pollution.

scholarly journals The quality of water of the Mantovo reservoir, Republic of Macedonia

2009 ◽  
Vol 61 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Valentina Slavevska-Stamenkovic ◽  
T. Stafilov ◽  
S. Smiljkov ◽  
M. Paunovic ◽  
S. Hristovski
Keyword(s):  
Organic Pollution ◽  
Nutrient Concentrations ◽  
Chemical Parameters ◽  
Limnodrilus Hoffmeisteri ◽  
Quality Of Water ◽  
Environmental Status ◽  
Physico Chemical ◽  
High Concentrations ◽  
Very High

The aim of the paper is to evaluate the quality of water of the Mantovo Reservoir (Southeast Macedonia)based on physico-chemical parameters and the macrozoobenthos. Monthly sampling was performed during 2003 and 2004. Temperature and DO depth profile data indicate that the Mantovo Reservoir is a dimictic lake. Based on mean nutrient concentrations, the Mantovo Reservoir can be considered as being phosphorus-deficient. During the summer stratification, very high concentrations of Mn (2,819 ?g/l)and Cu (147.6?g/l)were detected in the lower profundal. Limnodrilus hoffmeisteri was the dominant species, which indicates the presence of organic pollution. Dominance of Chaoborus crystallinus and decline in abundance of L. hoffmeisteri in the lower profundal indicate a deterioration of environmental status in the deepest part of the lake.

Distribution of phytoplankton community in Kotor Bay (south-eastern Adriatic Sea)

2012 ◽  
Vol 7 (3) ◽  
pp. 470-486 ◽  
Author(s):  
Dragana Drakulović ◽  
Branka Pestorić ◽  
Mirko Cvijan ◽  
Slađana Krivokapić ◽  
Nenad Vuksanović
Keyword(s):  
Phytoplankton Community ◽  
Adriatic Sea ◽  
Sampling Period ◽  
Single Species ◽  
Chemical Parameters ◽  
The South ◽  
Phytoplankton Assemblages ◽  
South Eastern ◽  
Physico Chemical ◽  
Shallow Coastal Area

AbstractThe goal of this paper was to explain variability of phytoplankton in a shallow coastal area in relation to physico-chemical parameters. Temporal variability and composition of phytoplankton were investigated in the Kotor Bay, a small bay located in the south-eastern part of the Adriatic Sea. Samplings were performed weekly from February 2008 to January 2009 at one station in the inner part of the Kotor Bay, at five depths (0 m, 2 m, 5 m, 10 m, 15 m). Phosphates, nitrites and nitrates ranged from values under the level of detection to the maximum values of 1.54, 1.53 and 23.91 µmol l−1, respectively. The phytoplankton biomass — represented by chlorophyll a concentration — ranged from 0.12 to 6.78 mg m−3, reaching a maximum in summer. Diatoms were present throughout the whole sampling period, reaching the highest abundance in March (3.42×105 cells l−1at surface). The peak of dinoflagellates in July (2.2×106 cells l−1 at surface) was due to a single species, Prorocentrum micans. The toxic dinoflagellate Dinophysis fortii occurred at a concentration of 2140 cells l−1 in May. The present results of phytoplankton assemblages and distribution provide valuable information for this part of the south-eastern Adriatic Sea where data is currently absent.

Use of QSAR in design of antiinflammatory fluorinated arylalkanoic acids

1990 ◽  
Vol 55 (1) ◽  
pp. 296-306 ◽  
Author(s):  
Miroslav Kuchař ◽  
Jaroslava Grimová ◽  
Václav Rejholec ◽  
Hana Tomková ◽  
Magda Jelínková ◽  
...  
Keyword(s):  
Antiinflammatory Activity ◽  
Hydrophobic Interactions ◽  
Biological Activities ◽  
Regression Equations ◽  
Chemical Parameters ◽  
Pharmacological Profile ◽  
Physico Chemical ◽  
Layer Chromatography ◽  
Fibrinolytic Capacity ◽  
Good Coincidence

A series of 3-fluro-4-alkoxyphenylalkanoic acids III was synthetized and their antiinflammatory activity and fibrinolytic capacity was evaluated. The suitable fluorinated derivative with better pharmacological profile than 3-chloro-4-benzyloxyphenylacetic acid (benzofenac) was selected. Experimental, biological activities of acids III were compared with those calculated by introducing the physico-chemical parameters into the formerly derived regression equations. Good coincidence was found out, as well as similarity of the regression derived for the original series of acids extended by the acids III. Lipophilicity of the acids under study was evaluated by partition thin-layer chromatography; the values of log P of benzyloxy derivatives IIIc-IIIf were lower than tabulated values - probably due to the intramolecular hydrophobic interactions of aromatic nuclei.

scholarly journals Impacts of the Physico-chemical Properties of Al-Chibayish Water Marshes on The Biodiversity of Phytoplankton

2021 ◽  
pp. 402-414
Author(s):  
Firas AbdulHassan Jaafar ◽  
Ahmed Saad Abdulwahhab
Keyword(s):  
Aquatic Ecosystems ◽  
Phytoplankton Community ◽  
Chemical Properties ◽  
P Value ◽  
Total Density ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Physical And Chemical ◽  
Clear Increase ◽  
And Chemical Properties

Phytoplankton, as one of the most important primary producers in aquatic ecosystems, has been widely used to indicate the health of ecosystems. Nine physico-chemical parameters of water, as well as the phytoplankton community, of Al-Chibayish marsh were studied. Samples were collected from four sites and analyzed every two months from January to October 2019.     Seasonal variations in physical and chemical properties were observed at all sites during the study period. The results indicated that 154 species of phytoplankton were recorded. The highest percentage of species was recorded to be 64.28% for Bacillariophyceae (diatoms) (Centrales 3.24% and Pennales 61.03%), followed by Chlorophyceae (16.23%), Cyanophyceae (11.68%), and Charophyceae and Euglenophyceae (3.24%), while Pyrrophyceae recorded the lowest value (1.29%) The numbers of phytoplankton species were 102, 94, 102, 99 in sites 1, 2, 3 and 4 ,respectively, during the study period.  The total density of phytoplankton ranged from 223.769 cells x103 during January to 2784.693 cells x103 during September in site 2, with a clear increase during March and September, while the lowest number was 223.796 - 237.248 cells x103 in January and May, respectively. The dominance of diatoms was observed in all sites by 49.07% of the total density of phytoplankton, while the lowest abundance was 0.04% for the Pyrrophyceae. The results of the statistical analysis showed significant differences among sites and months, concerning the physical, chemical, and biological factors measured during the study period, at p-value <0.05.

Spatial variations of phytoplankton community structure in a highly eutrophicated coast of the Western Mediterranean Sea

1995 ◽  
Vol 32 (9-10) ◽  
pp. 313-322 ◽  
Author(s):  
E. Soler Torres ◽  
J. G. del Río
Keyword(s):  
Phytoplankton Community ◽  
Sea Water ◽  
Western Mediterranean ◽  
Nutrient Concentrations ◽  
Western Mediterranean Sea ◽  
Open Sea ◽  
Southern Side ◽  
Well Differentiated ◽  
Abundance And Diversity ◽  
Physical And Chemical

Pinedo is a small beach placed at the southern side of Valencia (Eastern Spain). This coastal area has became highly eutrophicated because of the discharge of a large flow of urban wastewaters at the shore line. In order to assess the environmental impact of a new sea outfall and to study the phytoplankton and nutrients dynamics of this eutrophicated system a broad survey was conducted between May 1989 and April 1990. Physical and chemical parameters were measured through a transect laying between the wastewater discharge point and the open sea. In this paper we report preliminary results about the variations observed in the phytoplankton community along this sharp environmental gradient. Three main zones with particular phytoplankton structure appear well differentiated. The first is an inshore zone very influenced by continental loadings where brackish and polluted waters were found. Phytoplankton shows relatively low numbers being dominated by Chlorophyceae and a few other eurihaline species. An intermediate zone has salinities close to sea water but nutrient concentrations are high enough to allow maximum development of phytoplankton, which reaches its highest abundance and diversity values. Diatoms, dinoflagellates and some flagellates (Prymnesiophyceae and Cryptophyceae) dominate the eukaryotic community of this zone. Gradual impoverishment of sea water is accompanied by a rapid decrease of phytoplankton biomass, which is reduced to scarce flagellates populations at the open sea stations.

scholarly journals Analysis of Dissolved Oxygen and Nutrients in Zhanjiang Bay and the Adjacent Sea Area in Spring

2020 ◽  
Vol 12 (3) ◽  
pp. 889
Author(s):  
Dongyang Fu ◽  
Yafeng Zhong ◽  
Fajin Chen ◽  
Guo Yu ◽  
Xiaolong Zhang
Keyword(s):  
Dissolved Oxygen ◽  
Phytoplankton Bloom ◽  
Inorganic Nitrogen ◽  
Guangdong Province ◽  
Nutrient Concentrations ◽  
Western Coast ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Sea Area ◽  
The Impact

As a semi-closed bay with narrow bay mouths, the distribution of nutrients in Zhanjiang Bay was different from bays with open bay mouths and rivers with large flows. It is important to study the water quality of Zhanjiang Bay to determine the impact of human activities on this semi-closed bay. Based on field survey data in spring, the spatial distribution of nutrients and other physico-chemical parameters was investigated, in order to study the geochemical characteristics of nutrients in semi-closed bays. Higher nutrient concentrations were observed in the inner and outer bays, but lower concentrations were observed at the bay mouth. With other analyses of physico-chemical parameters, the higher nutrient concentrations in the inner bay originated mainly from the diluted freshwater input from local developments and rivers. With the strong flow that exists along the western coast of Guangdong Province, the higher dissolved inorganic nitrogen (DIN) and SiO3–Si concentrations along the outer bay may be influenced by discharge from local cities in western Guangdong Province. There was stronger phytoplankton assimilation at the bay mouth, which resulted in reduced nutrient concentrations in this area. Although the hydrographic characteristics between the inner bay and outer bay were significantly different, the distribution of chlorophyll-a (Chla) levels was similar. However, we found significantly low dissolved oxygen (DO) and high apparent oxygen utilisation (AOU) consumption levels in the inner bay, and high DO and low AOU levels in the outer bay, which suggested that decomposition was more important than photosynthesis in the closed bay, even in spring during the phytoplankton bloom.

Coupling of phytoplankton community structure to nutrients, ciliates and copepods in the Gulf of Gabès (south Ionian Sea, Tunisia)

2009 ◽  
Vol 90 (6) ◽  
pp. 1203-1215 ◽  
Author(s):  
Zaher Drira ◽  
Asma Hamza ◽  
Malika Bel Hassen ◽  
Habib Ayadi ◽  
Abderrahmen Bouain ◽  
...  
Keyword(s):  
Potential Role ◽  
Phytoplankton Community ◽  
Eastern Mediterranean ◽  
Ionian Sea ◽  
Phytoplankton Community Structure ◽  
Gulf Of Gabes ◽  
Gulf Of Gabès ◽  
Open Sea ◽  
High Nutrient ◽  
Preliminary Study

The summer spatial distribution of the phytoplankton community in the Gulf of Gabès (Tunisia, eastern Mediterranean Sea), together with environmental factors, were studied during a preliminary study conducted in July 2005 aboard the RV ‘Hannibal’. The phytoplankton community, which showed a decrease in concentration along a coastal–open sea gradient, was dominated by Dictyochophyceae (41%) followed by Dinophyceae (25%), Bacillariophyceae (16%), Cyanobacteriae (17%) and Euglenophyceae (1%). The phytoplankton found along the coast was dominated by opportunistic species (e.g. Dictyocha fibula) associated with high nutrient availability. In the open sea, phytoplankton development seemed influenced by Atlantic hydrodynamics. In addition, the Gulf of Gabès is characterized by an oligotrophic status with a summer stratification that impacted on species composition especially in off-shore areas. The coupling of phytoplankton dynamics to nutrients, ciliates and copepods showed the potential role played by ciliates not only as predators of phytoplankton but also as prey for filter-feeding copepods accounting for the increased fisheries productivity of the Gulf of Gabès.

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