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Multi-generation cadmium acclimation and tolerance in Daphnia magna Straus [An article from: Environmental Pollution]
Book Details
Author(s)B.T. Muyssen, C.R. Janssen
PublisherElsevier
ISBN / ASINB000RR0F8S
ISBN-13978B000RR0F88
AvailabilityAvailable for download now
Sales Rank12,820,369
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Environmental Pollution, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The cladoceran Daphnia magna was acclimated for seven generations to cadmium concentrations ranging from 0 (control) to 250 @mg/l Cd (corresponding to a free ion activity of 4.60 nM Cd^2^+). Acute and chronic cadmium tolerance as well as cadmium accumulation were monitored as a function of acclimation time. After two to three generations of acclimation to concentrations ranging from 0.23 to 1.11 nM Cd^2^+ increases in acute tolerance were maximal (factor 7.2) and significant. Acclimation for seven generations to the same acclimation concentrations did result in an increased chronic cadmium tolerance (21 days EC"5"0 values increased). Organisms acclimated to 1.93 nM Cd^2^+ were equally or more sensitive than non-acclimated daphnids in acute and chronic toxicity tests. Cadmium contents in D. magna increased significantly as a function of the acclimation concentration. Maximum body burdens of 236+/-30 @mg Cd/g dry weight were measured in organisms exposed to 4.60 nM Cd^2^+, but detoxification mechanisms were only successful up to 82+/-20 @mg Cd/g dry weight as this concentration did not cause major decreases in survival and reproduction in chronic toxicity tests. As the potential positive effect of acclimation on cadmium tolerance disappeared with successive acclimation generations and increasing acclimation concentrations, it is concluded that multi-generation acclimation studies are important for the evaluation of the long-term effects of environmental toxicants.
Description:
The cladoceran Daphnia magna was acclimated for seven generations to cadmium concentrations ranging from 0 (control) to 250 @mg/l Cd (corresponding to a free ion activity of 4.60 nM Cd^2^+). Acute and chronic cadmium tolerance as well as cadmium accumulation were monitored as a function of acclimation time. After two to three generations of acclimation to concentrations ranging from 0.23 to 1.11 nM Cd^2^+ increases in acute tolerance were maximal (factor 7.2) and significant. Acclimation for seven generations to the same acclimation concentrations did result in an increased chronic cadmium tolerance (21 days EC"5"0 values increased). Organisms acclimated to 1.93 nM Cd^2^+ were equally or more sensitive than non-acclimated daphnids in acute and chronic toxicity tests. Cadmium contents in D. magna increased significantly as a function of the acclimation concentration. Maximum body burdens of 236+/-30 @mg Cd/g dry weight were measured in organisms exposed to 4.60 nM Cd^2^+, but detoxification mechanisms were only successful up to 82+/-20 @mg Cd/g dry weight as this concentration did not cause major decreases in survival and reproduction in chronic toxicity tests. As the potential positive effect of acclimation on cadmium tolerance disappeared with successive acclimation generations and increasing acclimation concentrations, it is concluded that multi-generation acclimation studies are important for the evaluation of the long-term effects of environmental toxicants.
