scholarly journals Seasonal Variation of the Physico-chemical Composition of Ottawa River Waters in the St. Lawrence River

2018 ◽  
Author(s):  
Jean-Jacques Frenette ◽  
Ali A. Assani
Keyword(s):  
Seasonal Variation ◽  
Chemical Composition ◽  
River Waters ◽  
Ottawa River ◽  
Physico Chemical ◽  
St Lawrence River

Studies on the Effects of Pollution on the Diaton Communities of the St Lawrence River Near

1974 ◽  
Vol 9 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Alauddin Ahmad ◽  
Andrzej Chodorowski ◽  
Pierre Legendre
Keyword(s):  
Chemical Properties ◽  
Water Masses ◽  
Artificial Substrates ◽  
Total Hardness ◽  
Cladophora Glomerata ◽  
Algal Communities ◽  
Ottawa River ◽  
Glass Slides ◽  
Physico Chemical ◽  
St Lawrence River

Abstract A study was conducted to establish the physico-chemical and biological characteristics of two water masses (St. Lawrence and Ottawa) just before they meet near Montreal. The two water masses show marked differences in physico-chemical properties and in the composition of algal communities they support. As compared with that of St. Lawrence River, the water of Ottawa River shows lower values of alkalinity, conductivity, total hardness and chlorides. The value of pH is also slightly lower. But the quantity of Silica and Ammonia present in the Ottawa River is much higher. There is a marked difference in the composition of Algal communities supported by the two water masses. Over 100 species of Diatoms were found to colonize the artificial substrates (glass slides), of which only about 40 species were found to be common in both waters. Some 38 species were found only in St. Lawrence River and another 39 species only in Ottawa River. The two water masses also differed in supporting other groups of algae. Cladophora glomerata was very abundant in Ottawa River, whereas, it was absent or very rare in St. Lawrence River. On the other hand, some members of Zygnemaceae (like Sirogonium sticticum, Spirogyra sp., Mougeotia sp., and Zygnema sp.) were very abundant in St. Lawrence River and very rare in Ottawa River.

Phytoplankton assemblages in the St. Lawrence River, downstream of its confluence with the Ottawa River, Quebec, Canada

2000 ◽  
Vol 57 (S1) ◽  
pp. 16-30 ◽  
Author(s):  
Christiane Hudon
Keyword(s):  
Great Lakes ◽  
Water Clarity ◽  
Phytoplankton Assemblages ◽  
River Waters ◽  
Taxa Richness ◽  
Ottawa River ◽  
Water Characteristics ◽  
Biological Impacts ◽  
Lower Biomass ◽  
St Lawrence River

Consistent differences in physical, chemical, and biological characteristics were observed along a transversal river section located 2 km downstream of the confluence of the Ottawa and the St. Lawrence rivers. Phytoplankton sampled at stations subject to the influence of the St. Lawrence River had a lower biomass, smaller cell volume, lower chlorophyll a, and lower taxa richness than did phytoplankton at stations influenced by the Ottawa River. The stations influenced by St. Lawrence River waters showed regular seasonal changes in phytoplankton biomass and composition, reflecting the major impact of the stratification and mixing cycles observed in the Great Lakes. By comparison, at the stations influenced by Ottawa River waters, monthly variations were found in biomass and composition correlated with temperature and water clarity, suggesting the effects of the watershed's morphology. A discharge reduction of 12% in the St. Lawrence River and 46% in the Ottawa River between summer 1994 and summer 1995 coincided, for stations in both water masses, with lower biomass and greater species richness and an increase in taxa that generate noxious smells and odours. Phytoplankton is recommended for use in monitoring the biological impacts of changes in water characteristics resulting from human activities and climate change in the Great Lakes watershed.

Etude préliminaire du phytoplancton du lac Saint-Louis, élargissement du fleuve Saint-Laurent près de Montréal, Québec

1974 ◽  
Vol 52 (3) ◽  
pp. 489-501 ◽  
Author(s):  
Edith Alaerts-Smeesters ◽  
Etienne Magnin
Keyword(s):  
Seasonal Variation ◽  
Dominant Species ◽  
General View ◽  
Saint Louis ◽  
Ottawa River ◽  
Number Of Cells ◽  
St Lawrence River

Seventeen samples were collected at regular intervals from September 1970 to December 1971 from four sites on lake St. Louis; these stations received their water either from the St. Lawrence River, the Ottawa River, or both. For each species and sample of the 178 phytoplankton entities found, the number of cells per liter was estimated. A general view of the distribution of plankton organisms at each station is given as well as the seasonal variation of the major systematic groups and the dominant species.

Seasonal Variation of Physico-Chemical Parameters in Kedilam River, Tamil Nadu, India

2012 ◽  
Vol 2 (10) ◽  
pp. 1-3
Author(s):  
Gyaneswar Bhuyan ◽  
◽  
Dr. R. Anandhan Dr. R. Anandhan ◽  
V. kavitha V. kavitha
Keyword(s):  
Seasonal Variation ◽  
Tamil Nadu ◽  
Chemical Parameters ◽  
Physico Chemical

scholarly journals Physico-chemical attributes of water of Hakaluki Haor, Sylhet, Bangladesh

2016 ◽  
Vol 3 (2) ◽  
pp. 67-72
Author(s):  
Md Tajul Islam ◽  
M Mahfuzur Rahman ◽  
Hassan Mahmud
Keyword(s):  
Water Quality ◽  
Seasonal Variation ◽  
Water Samples ◽  
Water Quality Assessment ◽  
Inorganic Pollutants ◽  
Chemical Parameters ◽  
Ph Values ◽  
Physico Chemical ◽  
Significant Seasonal Variation ◽  
Chemical Attributes

Water quality assessment has been carried out in the Hakaluki Haor of greater Sylhet district during May, 2013 to February, 2014. Water samples were collected from 5 spots during 4 seasons and a total of 15 physico-chemical parameters were studied. Significant seasonal variation was observed in all seasons among physico-chemical parameters. pH values varied from 5.9 - 7.1, water temperature varied from 23.7 – 26.7OC, transference varied from 23-53 cm, TSS varied from 18.1-192 mg/l, TDS varied 25-193.5 mg/l, EC varied from 30-680 ?s/cm , DO content of water varied from 4.6 - 5.6mg/l, BOD varied from 0.2-2.614 mg/l, COD varied from 38-312 mg/l, NO3-N varied from 0.1-30.4 mg/l, NH3 varied from 0.9-2.18 mg/l, alkalinity varied from 12-42 mg/l and PO4 varied from 0.9 -13.4 (mg/l). Agricultural and inorganic pollutants have been observed as the main causes of the Haor water pollution.Jahangirnagar University J. Biol. Sci. 3(2): 67-72, 2014 (December)

Seasonal variation in the chemical composition of horse-mackerel ( Trachurus trachurus )

2001 ◽  
Vol 212 (5) ◽  
pp. 535-539 ◽  
Author(s):  
Narcisa Bandarra ◽  
Irineu Batista ◽  
Maria Nunes ◽  
José Empis
Keyword(s):  
Seasonal Variation ◽  
Chemical Composition ◽  
Horse Mackerel ◽  
Trachurus Trachurus

scholarly journals Sorption Characteristics of Bulgarian Penny Buns (Boletus Edulis)

2020 ◽  
Vol 180 ◽  
pp. 03008
Author(s):  
Albena Durakova
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Model Assessment ◽  
Physico Chemical ◽  
Bet Model ◽  
Monolayer Moisture Content ◽  
Desorption Isotherms ◽  
Monolayer Moisture ◽  
Model Linearization ◽  
Sorption Characteristics

The present study determined the sorption characteristics of Bulgarian penny buns (Boletus) for eight water activities in the 10 % 90 % range and at three temperatures, of 10 °С, 25 °С and 40 °С. The coefficients of the modified Oswin, Chung-Pfost, Halsey and Henderson models were obtained statistically. The modified Halsey model is recommended as a description of adsorption and desorption isotherms since it corresponds to the criteria for model assessment and suitability. Via BET model linearization, the values of the monolayer moisture content for water activity of aw > 0.5 and temperatures of 10 °С, 25 °С and 40 °С were established. The approximate physico-chemical composition of Bulgarian penny buns (Boletus) – moisture content – 10.80 %, protein – 32.23 %, carbohydrate 0.99 %, fat – 6.62 %, ashes – 6.20 % - was also determined.

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