Bioavailability of sediment-associated Cu and Zn to D. magna.
Exposures to mining-impacted, field-collected sediment (Clear Creek, CO, USA) contaminated with Cu (2.4 mg/g) and Zn (5.2 mg/g) were acutely toxic to juvenile Daphnia magna. Dissolved Cu and Zn in the overlying water (sediment + reference water) were at levels that could cause… Read More
Daphnia need to be gut cleared too: The effect of exposure to and ingestion of metal-contaminated sediment on the gut clearance patterns in D. magna
The presence of sediment particles in the gut indicated that Daphnia magna used in whole-sediment bioassays ingest sediment. If gut contents are not removed prior to whole-body tissue-burden analysis, then the bioavailability of any sediment-associated contaminants (e.g. metals)… Read More
Inhibitory effect of Anabaena sp. on in situ filtering rate of Daphnia
We found that in situ filtering rates of Daphnia spp. measured in a lake containing Anabaena were significantly lower than those measured in a filament-free lake. Even after accounting for the depressing effects of high nannoplankton biomass concentration, filtering rates in the… Read More
Factors regulating in situ filtering rates of Cladocera
Individual filtering rates of four species of Daphnia, as well as Holopedium, Diaphanosoma, Ceriodaphnia, and Bssmina, were measured in 10 lakes under various field conditions to identify important factors regulating in situ filter-feeding for these cladocerans. Linear regression… Read More