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Uptake and loss of Bacillus thuringiensis var. israelensis by Daphnia magna in laboratory exposure
Author(s) -
Vaishnav Dinesh D.,
Anderson Richard L.
Publication year - 1995
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620140504
Subject(s) - daphnia magna , bacillus thuringiensis , spore , daphnia , biology , cladocera , ingestion , bacillales , microbiology and biotechnology , toxicity , chemistry , bacteria , ecology , biochemistry , bacillus subtilis , zooplankton , organic chemistry , genetics
We determined the ingestion and loss of the spores of Bacillus thuringiensis var. israelensis (Bti) by a nontarget organism Daphnia magna. Daphnids were either not fed or fed during the exposure to the spores. The results showed that (a) the uptake rates with unfed and fed daphnids were approximately first‐order with respect to spore concentration, and the rate constants for unfed and fed daphnids were 5.5 × 10 −5 and 1.4 × 10 −7 L daphnid −1 h −1 , respectively, and (b) unfed and fed daphnids rapidly depurated the majority of the accumulated spores, and the depuration rate constants for unfed and fed daphnids were 0.13 and 0.15 h −1 , respectively.