daphnia

Glyphosate is toxic at environmentally relevant concentrations to a variety of species such as frogs, fish, daphnia, earthworms, bees, etc and indeed a UK study documents glyphosate poisoning, including deaths of cats and dogs from 1999 to 2013 (Bates, 2013).

In the 1990s (August-October), zooplankton biomass was dominated by Daphnia cucullata Sars, D.

In contrast, model species such as Daphnia magna and Cyprinus carpio have been frequently used (Fig.

These wastewaters contained organic micropollutants that affected signaling pathways, consistent with xenobiotic metabolism; in addition, they caused toxicity to aquatic organisms such as Daphnia magna.

Jennifer said that Colin used to go to ponds and scoop up the small Daphnia crustaceans and sell them on to Mr Wortley to use as feed for his goldfish who apparently found them very tasty.

In one study, for example, newly hatched Atlantic salmon were fed colored Daphnia in tanks with different background colors, which changed the ability of salmon to catch and eat prey, indicating feeding would be better if tank color contrasted with food color.

The most abundant group were the Copepods of the genus Thermocyclops sp., followed by the cladoceran Daphnia sp., Two species of Daphnia were observed: Daphnia laevis, which was the most abundant and Daphnia gessneri, with much lower density.

In their researches median lethal concentration [LC.sub.50] and median effective concentration [EC.sub.50] values were obtained for algae Selenastrum capricornutum in the range from 224 mg/l to 150 mg/l, Chlorella vulgaris--from 370 mg/l to 63 mg/l, rotifer Brachionus calyciflorus--from 1200 mg/l to 42 mg/l, crustacean Daphnia magna--from 78 mg/l to 10 mg/l, crustacean Thamnocephalus platyurus--from 75.5 mg/l to 33 mg/l, crustacean Artemia salina--from 260 mg/l to 175 mg/l, bacteria Vibrio fischeri--from 42 mg/l to 21.1 mg/l (Zaleska-Radziwill 1997; Sheedy et al.

The zooplankton, Daphnia magna, is a fresh or brackish water organism widely used as a standard indicator species in a variety of ecological studies.

Briefly, Daphnia neonates (<24h old) were maintained in 50 mL beakers containing 30 mL COMBO medium spiked with diazinon at a concentration range of0, 0.5,1,2, 5, and 10 [micro]g x [L.sup.-1].