Preliminary toxicity tests using the green alga,Ankistrodesmus falcatus

1997 ◽  
Vol 12 (1) ◽  
pp. 11-14 ◽  
Author(s):  
A. Magdaleno ◽  
C. E. Gomez ◽  
C. G. Velez ◽  
J. Accorinti
Keyword(s):  
Green Alga ◽  
Toxicity Tests ◽  
Ankistrodesmus Falcatus

Increased fecundity of the cladoceran Moinodaphnia macleayi on a diet supplemented with a green alga, and its use in uranium toxicity tests

1993 ◽  
Vol 44 (3) ◽  
pp. 389 ◽  
Author(s):  
RV Hyne ◽  
A Padovan ◽  
DL Parry ◽  
SM Renaud
Keyword(s):  
Unsaturated Fatty Acids ◽  
Lipid Fraction ◽  
Algal Species ◽  
Cichlid Fish ◽  
Dry Weight ◽  
Scenedesmus Quadricauda ◽  
Toxicity Tests ◽  
Ankistrodesmus Falcatus ◽  
Algal Diets ◽  
Chlamydomonas Sp

The effects of two synthetic diets and four algal diets on the survival and fecundity of Moinodaphnia macleayi for use in life-cycle toxicity tests were determined. The synthetic foods were a suspension of blended cichlid fish pellets with powdered alfalfa, either prepared fresh or fermented in natural water for 3 days. The algae, isolated from the habitat of M. rnacleayi in the Alligator Rivers Region, were Selenastrum sp., Ankistrodesmus (falcatus?), Scenedesmus quadricauda and a Chlamydomonas sp. Each alga was tested alone or as a supplement to the fermented synthetic food. The diet that supported the greatest number of young and the highest survival rate over a 5-day period was a combination of the fermented synthetic food and Chlamydomonas sp. Analysis of the fatty acid composition of the lipid fraction of the four algal species showed that Chlamydomonas sp., Selenastrum sp. and Scenedesmus quadricauda had significant concentrations of the highly unsaturated fatty acids 18 : 2(n-6), 18 : 3(n-6) and 18: 3(n-3). In terms of size and dry weight, Chlamydomonas sp. was the smallest of the algal cells studied. The toxicity of uranium to M. macleayi survival, determined under standard conditions, was a lowest-observed-effect concentration (LOEC) of 200 �g L-1 after 48 h and 25 �g L-1 after 5 days.

Inhibition of Photosystem II in the Green Alga Ankistrodesmus falcatus by Copper

1978 ◽  
Vol 44 (4) ◽  
pp. 434-438 ◽  
Author(s):  
YUZO SHIOI ◽  
HIROKO TAMAI ◽  
TSUTOMU SASA
Keyword(s):  
Photosystem Ii ◽  
Green Alga ◽  
Ankistrodesmus Falcatus

Toxicity of the Herbicide Metolachlor, some Transformation Products and a Commercial Safener to an Alga (Selenastrum capricornutum), a Cyanophyte (Anabaena cylindrica) and a Macrophyte (Lemna gibba)

1996 ◽  
Vol 31 (1) ◽  
pp. 197-214 ◽  
Author(s):  
K.E. Day ◽  
V. Hodge
Keyword(s):  
Green Alga ◽  
Parent Compound ◽  
Dry Weight ◽  
Transformation Products ◽  
Selenastrum Capricornutum ◽  
Toxicity Tests ◽  
Cell Biomass ◽  
Inhibition Of Growth ◽  
Quality Guideline ◽  
Herbicide Metolachlor

Abstract The toxicity of the herbicide metolachlor, three photodegradation products (CGA-40172, CGA-40919, CGA-37735), two metabolic products (CGA-50720, CGA-51202) and a commercial safener (benoxacor) was determined in plant toxicity tests. The species tested were the green alga, S. capricornutum, the blue-green cyanophyte, A. cylindrica, and duckweed, L. gibba. The endpoint measured for all three species was inhibition of growth determined as a decrease in cell biomass for the algae or a decrease in frond production and dry weight in duckweed. S. capricornutum was the most sensitive species to the parent compound (72-h IC50’s ranged from 37.2-55.8 µg/L) followed by L. gibba (7-day IC50’S ranged from 304-788 µg/L for decreased frond production or 766 µg/L for a decrease in dry weight). The blue-green alga, A. cylindrica, was not affected by any of the compounds tested at concentrations as high as 4.0 mg/L. None of the transformation products was toxic at concentrations up to 10 mg/L. The safener decreased growth of S. capricornutum at concentrations ranging from 1,730-2,050 µg/L (72-h IC50’s). It is recommended that the interim Canadian water quality guideline of 8 µg/L be reexamined in light of these and other data.

Accumulation and Metabolism of Tri-n-butyltin Cation by a Green Alga, Ankistrodesmus falcatus

1984 ◽  
Vol 41 (3) ◽  
pp. 537-540 ◽  
Author(s):  
R. J. Maguire ◽  
P. T. S. Wong ◽  
J. S. Rhamey
Keyword(s):  
Green Alga ◽  
Bioconcentration Factor ◽  
Environmental Persistence ◽  
Ankistrodesmus Falcatus

Tributyltin pesticides are increasingly widespread, but their environmental persistence is poorly known. The accumulation and metabolism of tri-n-butyltin cation (Bu3Sn+) by a green alga, Ankistrodesmus falcatus, was determined at 20 °C over a 4-wk period; about 50% of the original Bu3Sn+ was converted to di-n-butyltin (Bu2Sn2+) and small quantities of butyltin (BuSn3+) and inorganic tin. An apparent algal bioconcentration factor of 3 × 104 was estimated for Bu3Sn+.

Bioaccumulation and Metabolism of Tri- and Dialkyllead Compounds by a Freshwater Alga

1987 ◽  
Vol 44 (6) ◽  
pp. 1257-1260 ◽  
Author(s):  
P. T. S. Wong ◽  
Y. K. Chau ◽  
J. L. Yaromich ◽  
O. Kramar
Keyword(s):  
Green Alga ◽  
Freshwater Alga ◽  
Metabolic Processes ◽  
Long Period ◽  
Inorganic Lead ◽  
Ankistrodesmus Falcatus ◽  
Concentration Factors

A freshwater green alga, Ankistrodesmus falcatus, exposed to solutions of trialkyllead, dialkyllead, and inorganic lead (II) compounds (1 mg/L) for 24 h accumulated these compounds with concentration factors of about 100, 2000, and 20 000, respectively. Incubation of this alga with trimethyllead and dimethyllead species over a long period (28 d) revealed the ability of the organism to metabolize these compounds. The metabolic processes for trimethyllead followed a dealkylation sequence with the formation of dimethyllead and lead (II) compounds. The alga not ony accumulated dimethyllead, but also contained significant amounts of trimethyllead and lead (II) compounds. Neither chemical disproportionation reactions nor photodecomposition could account for the quantities produced.

Lipids extraction from the green alga Ankistrodesmus falcatus using different methods

2016 ◽  
Vol 27 (3) ◽  
pp. 589-595 ◽  
Author(s):  
Mostafa M. El-Sheekh ◽  
Ragaa A. Hamouda
Keyword(s):  
Green Alga ◽  
Ankistrodesmus Falcatus
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