Romare and Bergman (1999) reported that average densities of 0.3 ind [m.sup.-3] of the YOY fish can affect the recovery of Daphnia
, and the latter will be totally suppressed at YOY fish densities of 0.7 ind [m.sup.-3].
A comparison of the response of Simocephalus mixtus (Cladocera) and Daphnia
magna to contaminated freshwater sediments.
The canonical correspondence analysis including only the six best fitting phytoplankton species, showed that only Daphnia
was most related with C.
The scope of the research included conducting of the following single-species bioassays with representatives of different trophic levels on wastewater containing phenol: algal growth inhibition test with Desmodesmus quadricauda, immobilization toxicity test with crustacean Daphnia
magna Straus, fish Lebistes reticulatus Peters and Danio rerio, enzymatic tests with Daphnia
magna Straus and bacteria Vibrio fischeri.
magna (1 day young) used in the experiment was cultured according to the standard rearing procedure .
The present study confirmed that diazinon poses significant risk to aquatic organisms, namely, nontarget Daphnia
El resultado del analisis para la prueba con Daphnia
magna por el modelo Probit para mortandad, se estima valores letales de 1.28 g BaS[O.sub.4]/l a las 48 horas.
However, given the sensitivity of these organisms, many other factors possibly led to this result, such as concentration of toxic substances to Daphnia
, including chlorpyrifos degradation products, organic acids and even pathogenic microorganisms.
That research produced five populations of Daphnia
adapted to salt concentrations ranging from the current concentration of 15 milligrams per liter of chloride in Lake George, to concentrations of 1,000 milligrams per liter as found in highly contaminated lakes in North America.
In this work it was studied the microscopic structure of the filter apparatus of three different sized species of cladoceran daphnids typical of tropical and subtropical environments (Ceriodaphnia silvestrii Daday, 1902; Ceriodaphnia cornuta Sars, 1885 and Daphnia
gessneri Herbst, 1967).
Os efeitos agudos foram avaliados de acordo com a norma NBR 12713 de ecotoxicologia aquatica com o organismo Daphnia
magna, sendo estimados pelo fator de toxicidade (FT) (ABNT, 2009).
Dicranophorus epicharis (32.14%), Keratella quadrata (16.96%), and Anuraeopsis fissa (9.77%) from Rotifera and Chydorus sphaericus (7.25%) and Daphnia
longispina (1.20%) from Cladocera were the dominant species, while the only species of Copepoda was represented by Arctodiaptomus acutilobatus.