Sensitivities of Australian and New Zealand amphipods to copper and zinc in waters and metal-spiked sediments
The sensitivities of eight benthic amphipods, Chaetocorophium cf. lucasi, Corophium colo, Grandidierella japonica, Hyale crassicornis, Hyale longicornis, Melita awa, Melita matilda and Melita plumulosa, to copper and zinc in water-only and whole-sediment toxicity tests were compared. Whole-sediment...
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Veröffentlicht in: | Chemosphere (Oxford) 2006-06, Vol.63 (9), p.1466-1476 |
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Sprache: | eng |
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Zusammenfassung: | The sensitivities of eight benthic amphipods,
Chaetocorophium cf.
lucasi,
Corophium colo,
Grandidierella japonica,
Hyale crassicornis,
Hyale longicornis,
Melita awa,
Melita matilda and
Melita plumulosa, to copper and zinc in water-only and whole-sediment toxicity tests were compared. Whole-sediment tests used copper- (1300
mg/kg) and zinc- (4000
mg/kg) spiked sediments after equilibration for sufficient time to produce pore water and overlying water concentrations below the lowest observable effect concentrations of water-only exposures. Survival of adults (after 10
d) and juveniles (after 96
h), and the metal concentrations in the body tissues of adults, were determined at the end of the tests. Two epibenthic amphipods from the genus
Melita were the most sensitive species to aqueous copper and zinc, with a 96-h LC50 value of 120
μg
Cu/l for both
M. awa and
M. plumulosa juveniles, and a 96-h LC50 value of 640
μg
Zn/l for juveniles of
M. plumulosa. Juvenile amphipods (7-d old) were more sensitive than adult amphipods (>30-d old) in both water-only and whole-sediment tests, with adult-LC50/juvenile-LC50 ratios in water-only tests ranging from 1.2 to l.5 for copper and 1 to 1.4 for zinc. All species except
C. colo,
C. cf.
lucasi and
M. matilda were sensitive to the copper-spiked sediment, with survival between 14% and 74% of controls. Similarly, all species except
C. colo and
G. japonica, showed a response to the zinc-spiked sediment (26–81% of control survival). The epibenthic amphipods were more sensitive than the infaunal tube-dwelling amphipods and are recommended as test species. |
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ISSN: | 0045-6535 1879-1298 |
DOI: | 10.1016/j.chemosphere.2005.09.020 |