Uptake from Sea Water and Clearance of 14 C- p , p ′-DDT by the Marine Copepod Calanus finmarchicus
It is impossible to measure the uptake rate of p,p′-DDT by copepods from sea water directly since uptake and depuration occur simultaneously. Copepods were found to lose p,p′-DDT exponentially in flowing sea water with a rate constant of k j = 0.048/day; [Formula: see text]. Five experiments were pe...
| Published in: | Journal of the Fisheries Research Board of Canada |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
1977
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/f77-027 http://www.nrcresearchpress.com/doi/pdf/10.1139/f77-027 |
| Summary: | It is impossible to measure the uptake rate of p,p′-DDT by copepods from sea water directly since uptake and depuration occur simultaneously. Copepods were found to lose p,p′-DDT exponentially in flowing sea water with a rate constant of k j = 0.048/day; [Formula: see text]. Five experiments were performed to obtain uptake rates with DDT concentrations ranging from 32.5 to 1337 pptr in sea water. Copepod uptake of p,p′-DDT from sea water is amply described by a single-compartment model, [Formula: see text], which accounts for influx and efflux of DDT. Calculated influx rate constants, k i , varied between 1.5 and 2.7 × 10 3 /day. These results enable prediction of DDT levels in nonfeeding copepods if the concentration of DDT in sea water is known. |
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