Results 191 to 200 of about 32,854 (216)

Evolution of cadmium resistance in Daphnia magna

Environmental Toxicology and Chemistry, 2005
Abstract A diverse laboratory population of Daphnia magna Straus was established by combining individuals from eight sources. Artificial selection for increased resistance to the acute toxic effects of cadmium was performed, and after eight generations, the average median effective concentration increased from 61 to 180 μg/L.
Timothy J, Ward, William E, Robinson
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Sub-lethal effects of acetone on Daphnia magna

Ecotoxicology, 2007
There is increasing concern about the sub-lethal effect of hydrophobic chemicals in the water medium. Even though acetone is a commonly used solvent in toxicity testing, few studies have focussed on its chronic toxicity to Daphnia magna and the available results are often contradictory. In this study, acetone was tested on D. magna in a 21-day exposure
LEONI, BARBARA, Bettinetti, R, Galassi, S.   +2 more
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DAPHNIA MAGNA FOOD STUDY TEST

1986
The macroinvertebrate, Daphna magna, extensively in environmental toxicity testing. The Environmental Protection Agency is used Therefore, (EPA) has been commissioned to develop standard testing procedures. Most variables have been standardized, but the current trout chow and Selenastrum capricorntum (TC/S) food combination recommended by the EPA is ...
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Ekotoksikološki testovi: Daphnia magna

2017
Očuvanje bioraznolikosti primarna je zadaća planova upravljanja i mjera zaštite vlažnih staništa, no industrijski razvoj civilizacije omogućio je zadiranje čovjeka i u nasitnije pore ovih krhkih ekosustava. Smanjenje bioraznolikosti primani je pokazatelj u kojoj mjeri čovjek svojim djelatnostima zadire u određeni slatkovodni ekosustav.
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Daphnia magna ecotoxicity test with parathion

Chemosphere, 1998
Abstract The toxicity test with organophosphate insecticide - parathion - was determined on neonates (0–6h old) and juveniles (up 96h old) of Daphnia magna , Straus 1820, Clone A. Organisms (10 per test chamber) were exposed to 7 toxicant concentrations plus control in the flow-through system, containing ASTM hard water.
Bożena Śosak-Swiderska, Danuta Tyrawska, Danuta Dzido   +2 more
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Toxicity of uranium to Daphnia magna

Water, Air, and Soil Pollution, 1984
The toxicity of U to Daphnia magna was determined in acute and chronic tests. The 48-hr LC50 of U (VI) in Columbia River water was 6 mg L−1. Acute toxicity diminished by a factor of 7.5 as mean water hardness and alkalinity values increased from 70 mg L−1. and 57 mg L−1. to 195 mg L−1. and 130 mg L−1. respectively.
T. M. Poston, R. W. Hanf, M. A. Simmons
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Intersex and male development in Daphnia magna

Hydrobiologia, 2001
Sex induction is environmentally stimulated in Daphnia and involves a cue-dependent response for sex determination. Somatic growth was shown to be similar in males and females during juvenile instars, but divergent due to a reduction in male somatic growth, at about the time that females produce ovaries.
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Thermal avoidance and preference in Daphnia magna

Journal of Thermal Biology, 2000
Abstract 1. Water fleas (Daphnia magna) bred at 23°C were non-responsive to temperatures between 13 and 25°C. 2. At the lower (11°C) and upper limits (30°C) their klinokinetic avoidance behaviour showed a larger intraindividual than interindividual variation. 3. Thermal sensitivity for avoidance responses in D. magna was about 1.5°C. 4.
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Daphnia magna (Cladocera:Chydoroidea)

Journal of Invertebrate Pathology, 1978
R.M. Sayre, T.B. Clark
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Daphnia magna

Why would somebody write a voluminous monograph on a single species of Cladocera? Eventually one might contact a student or an ecotoxicologist confronted with a question concerned with population biology, population genetics, aquatic ecology, aquatic physiology or ecotoxicology.
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