Toxicity of a Mixture of Metals on Freshwater Algae

1978 ◽  
Vol 35 (4) ◽  
pp. 479-481 ◽  
Author(s):  
P. T. S. Wong ◽  
Y. K. Chau ◽  
P. L. Luxon
Keyword(s):  
Water Quality ◽  
Great Lakes ◽  
Key Words ◽  
Green Algae ◽  
Primary Productivity ◽  
Lake Water ◽  
Metal Toxicity ◽  
Culture Medium ◽  
Freshwater Algae ◽  
Water Quality Objectives

Recommended levels of a number of metals for Great Lakes Water Quality Objectives were found to be very toxic to freshwater algae when these metals were present simultaneously in lake water and culture medium. The diatom tested was more sensitive to metal toxicity than the blue-green and green algae. Key words: metals, Water Quality Objectives, toxicity, algae, diatom, primary productivity

scholarly journals SATELLITE OBSERVED WATER QUALITY CHANGES IN THE LAURENTIAN GREAT LAKES DUE TO INVASIVE SPECIES, ANTHROPOGENIC FORCING, AND CLIMATE CHANGE

2017 ◽  
Vol XLII-3/W2 ◽  
pp. 189-195 ◽  
Author(s):  
R. A. Shuchman ◽  
K. R. Bosse ◽  
M. J. Sayers ◽  
G. L. Fahnenstiel ◽  
G. Leshkevich
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Time Series ◽  
Great Lakes ◽  
Primary Productivity ◽  
Lake Superior ◽  
Water Clarity ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Laurentian Great Lakes

Long time series of ocean and land color satellite data can be used to measure Laurentian Great Lakes water quality parameters including chlorophyll, suspended minerals, harmful algal blooms (HABs), photic zone and primary productivity on weekly, monthly and annual observational intervals. The observed changes in these water quality parameters over time are a direct result of the introduction of invasive species such as the <i>Dreissena</i> mussels as well as anthropogenic forcing and climate change. Time series of the above mentioned water quality parameters have been generated based on a range of satellite sensors, starting with Landsat in the 1970s and continuing to the present with MODIS and VIIRS. These time series have documented the effect the mussels have had on increased water clarity by decreasing the chlorophyll concentrations. Primary productivity has declined in the lakes due to the decrease in algae. The increased water clarity due to the mussels has also led to an increase in submerged aquatic vegetation. Comparing water quality metrics in Lake Superior to the lower lakes is insightful because Lake Superior is the largest and most northern of the five Great Lakes and to date has not been affected by the invasive mussels and can thus be considered a control. In contrast, Lake Erie, the most southern and shallow of the Laurentian Great Lakes, is heavily influenced by agricultural practices (i.e., nutrient runoff) and climate change, which directly influence the annual extent of HABs in the Western Basin of that lake.

scholarly journals Planktivores and Plankton Dynamics: Effects of Fish Biomass and Planktivore Type

1992 ◽  
Vol 49 (7) ◽  
pp. 1466-1473 ◽  
Author(s):  
Xavier Lazzaro ◽  
Ray W. Drenner ◽  
Roy A. Stein ◽  
J. Durward Smith
Keyword(s):  
Water Quality ◽  
Green Algae ◽  
Primary Productivity ◽  
Trophic Cascade ◽  
Gizzard Shad ◽  
Particulate Phosphorus ◽  
Fish Biomass ◽  
Dorosoma Cepedianum ◽  
Pennate Diatoms ◽  
Plankton Communities

We quantified the effects of planktivore biomass and planktivore type in an experimental mesocosm study of factorial design in which five levels of fish biomass (0–75 g/m3) were cross-classified with two plantivore types: filter-feeding gizzard shad (Dorosoma cepedianum) and visual-feeding bluegill (Lepomis macrochims). As fish biomass increased, cladocerans, cyclopoids, particulate phosphorus (PP) > 200 μm, and chironomids declined; conversely, rotifers, primary productivity, chlorophyll a, turbidity, unicellular flagellates, colonial and unicellular green algae, pennate diatoms, total phosphorus, and 20–200 and 12–20 μm PP were enhanced. In the presence of gizzard shad, as compared with bluegill, cyclopoids, turbidity, unicellular green algae, pennate diatoms, > 200 μm PP, and chironomid tubes were higher whereas colonial green algae and < 0.2 μm PP were lower. Fish biomass operated independently of planktivore type for most variables, except copepods, colonial green algae, turbidity, and 20–200 μm PP. Although gizzard shad and bluegill have different trophic cascade pathways, fish biomass was more important than planktivore type as a regulator of plankton communities and water quality.

Improvement of Lake Water Quality by using Moving Rapid Water Treatment System

2018 ◽  
Vol 18 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Kwang-Hee Lee ◽  
◽  
Min-Ho Kim ◽  
Nam-Woo An ◽  
Chul-hwi Park
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Lake Water ◽  
Treatment System ◽  
Lake Water Quality ◽  
Water Treatment System

Detection of Metal Toxicity Using Natural Phytoplankton as Test Organisms in the Great Lakes

1993 ◽  
Vol 28 (1) ◽  
pp. 155-176
Author(s):  
Mohiddin Munawari ◽  
Milos Legner
Keyword(s):  
Great Lakes ◽  
Metal Toxicity ◽  
Structural Changes ◽  
System Response ◽  
Turnover Rates ◽  
High Turnover ◽  
Spectra Analysis ◽  
Test Organisms ◽  
Future Potential ◽  
Natural Phytoplankton

Abstract This paper presents an overview of techniques utilizing natural phytoplankton for the detection of metal-Induced stress in the Great Lakes. Both field and laboratory procedures are designed to evaluate either structural changes or functional response of test organisms. This up-to-date compendium provides a choice of techniques, which permits a holistic assessment of the stress caused by toxic metals. Recently introduced techniques, such as normalized size spectra analysis, flow cytometry, and the evaluation of a continuous-flow system response to metal toxicity, are discussed in more detail to explore their future potential. Owing to their key position in the food web, high turnover rates, abundance, and sensitivity to environmental perturbation, phytoplankton serve as reliable early warning indicators of ecosystem deterioration and its restoration.

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