Results 151 to 160 of about 6,405 (190)

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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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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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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Sex Determination in Daphnia Magna

Ecology, 1990
The factors inducing male offspring and the mechanism of sex—ratio adjustment were investigated in Daphnia magna, a cyclically parthenogenetic cladoceran (Crustacea). Laboratory experiments were conducted on individual animals living in flow—through chambers, to separate the effects of various density—dependent factors.
Anders Hobaek, Peter Larsson
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The effects of nonylphenol on Daphnia magna

Water Research, 1993
Abstract The acute and chronic toxicity of nonylphenol to the freshwater invertebrate Daphnia magna has been determined. The acute 24 and 48 h EC 50 values, based on immobilization, were 0.30 and 0.19 mg/l, respectively, using mean measured concentrations.
M.H.I. Comber, T.D. Williams, K.M. Stewart   +2 more
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Transcriptome alterations in female Daphnia (Daphnia magna) exposed to 17β-estradiol

Environmental Pollution, 2020
The molecular mechanism of evaluating 17β-estradiol (E2)-induced toxicity in female Daphnia magna has not been determined. In this study, the transcriptome of D. magna was analyzed after exposure to three different concentrations (0, 10, and 100 ng L-1) of E2 at 3, 6, and 12 h.
Yao, Zheng, Julin, Yuan, Zhimin, Gu, Guang, Yang, Tian, Li, Jiazhang, Chen   +5 more
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Cadmium resistance in Daphnia magna

Aquatic Toxicology, 1990
Abstract The potential of the water-flea Daphnia magna to develop resistance to cadmium was investigated. Three successive generations of daphnids were exposed to sublethal cadmium concentrations, and thereafter the cadmium resistance was assessed in acute LC50-tests. Resistance to cadmium was found to be acquired during a single generation.
C.W.M. Bodar, I. van der Sluis, J.C.P. van Montfort, P.A. Voogt, D.I. Zandee   +4 more
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The development of Daphnia magna

1956
A general account is given of the development of Daphnia magna from the egg to the mature adult. A review of previous work reveals that authors have concentrated on the early development, neglecting the later development. An adequate technique has been developed.An account of the development based on living material gives a detailed series of stages. A
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Daphnia magna (Cladocera:Chydoroidea)

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

Journal of Pineal Research, 2009
Magdalena, Markowska, Piotr, Bentkowski, Malgorzata, Kloc, Joanna, Pijanowska   +3 more
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