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Uptake and effects of copper and cadmium in the gonad of the scallop Placopecten magellanicus : concurrent metal exposure

Uptake and effects of copper and cadmium in the gonad of the scallop Placopecten magellanicus :... 227 97 97 2 2 E. Gould R. J. Thompson L. J. Buckley D. Rusanowsky G. R. Sennefelder Northeast Fisheries Center, Milford Laboratory NOAA National Marine Fisheries Service 06460 Milford Connecticut USA Marine Sciences Research Laboratory Memorial University A1C 5S7 St. John's Newfoundland Canada Northeast Fisheries Center Narragansett Laboratory NOAA National Marine Fisheries Service 02882 Narragansett Rhode Island USA Abstract Sea scallops Placopecten magellanicus in early gametogenesis from the southern shelf of Hudson Canyon, New Jersey, USA, were exposed in late winter 1984 to sublethal levels of Cu and Cd in a flowing seawater system at the NMFS Milford Laboratory. Exposure was to copper (10 and 20 μgl -1 : low-Cu and high-Cu groups) or to a combination of copper and equimolar cadmium (10μg Cu+17.7 μg Cdl -1 : low-Cu/Cd group) for eight weeks, with sampling at 2-wk intervals. Copper had a strongly inhibitory effect on gamete production and maturation, which in some respects was partially moderated in the presence of cadmium in the female gonad only. Total gamete weight per scallop doubled in control individuals but dropped by 60% in both high-metal exposure groups over the 8-wk exposure period, with a smaller, temporary decrease in the low-Cu group. Cadmium did not add to the inhibition by copper of gamete development in the low-Cu/Cd group, but there was no partial recovery at 8 wk, as was seen in female scallops exposed to low-Cu alone. Gonadal RNA, higher in the females, decreased proportionately more in that sex than in the males of the metal exposure groups. Conversely, DNA levels were higher in the male than in the female gonad, and decreased sharply in all metal-exposed males. Gonadal protein concentration also dropped in all metal-exposed scallops with time and degree of metal exposure. Copper uptake in the gonad increased with time and metal exposure concentration, and cadmium increased in the low-Cu/Cd group with time. In contrast, manganese decreased significantly in the gonads of Cu-exposed scallops, especially in the high-Cu group. In the low-Cu/Cd group, manganese concentrations stabilized after an initial sharp drop at 2 wk in the low-Cu/Cd group, then rose at 6 and 8 wk. We ascribe this phenomenon to the induction by cadmium of metal-binding proteins (Fowler and Megginson 1986). In both sexes, gonadal magnesium concentrations did not change with increasing tissue burdens of copper and cadmium, but instead rose initially in proportion to the degree of metal exposure, homeostasis being maintained thereafter. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Uptake and effects of copper and cadmium in the gonad of the scallop Placopecten magellanicus : concurrent metal exposure

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References (22)

Publisher
Springer Journals
Copyright
Copyright © 1988 by Springer-Verlag
Subject
Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/BF00391305
Publisher site
See Article on Publisher Site

Abstract

227 97 97 2 2 E. Gould R. J. Thompson L. J. Buckley D. Rusanowsky G. R. Sennefelder Northeast Fisheries Center, Milford Laboratory NOAA National Marine Fisheries Service 06460 Milford Connecticut USA Marine Sciences Research Laboratory Memorial University A1C 5S7 St. John's Newfoundland Canada Northeast Fisheries Center Narragansett Laboratory NOAA National Marine Fisheries Service 02882 Narragansett Rhode Island USA Abstract Sea scallops Placopecten magellanicus in early gametogenesis from the southern shelf of Hudson Canyon, New Jersey, USA, were exposed in late winter 1984 to sublethal levels of Cu and Cd in a flowing seawater system at the NMFS Milford Laboratory. Exposure was to copper (10 and 20 μgl -1 : low-Cu and high-Cu groups) or to a combination of copper and equimolar cadmium (10μg Cu+17.7 μg Cdl -1 : low-Cu/Cd group) for eight weeks, with sampling at 2-wk intervals. Copper had a strongly inhibitory effect on gamete production and maturation, which in some respects was partially moderated in the presence of cadmium in the female gonad only. Total gamete weight per scallop doubled in control individuals but dropped by 60% in both high-metal exposure groups over the 8-wk exposure period, with a smaller, temporary decrease in the low-Cu group. Cadmium did not add to the inhibition by copper of gamete development in the low-Cu/Cd group, but there was no partial recovery at 8 wk, as was seen in female scallops exposed to low-Cu alone. Gonadal RNA, higher in the females, decreased proportionately more in that sex than in the males of the metal exposure groups. Conversely, DNA levels were higher in the male than in the female gonad, and decreased sharply in all metal-exposed males. Gonadal protein concentration also dropped in all metal-exposed scallops with time and degree of metal exposure. Copper uptake in the gonad increased with time and metal exposure concentration, and cadmium increased in the low-Cu/Cd group with time. In contrast, manganese decreased significantly in the gonads of Cu-exposed scallops, especially in the high-Cu group. In the low-Cu/Cd group, manganese concentrations stabilized after an initial sharp drop at 2 wk in the low-Cu/Cd group, then rose at 6 and 8 wk. We ascribe this phenomenon to the induction by cadmium of metal-binding proteins (Fowler and Megginson 1986). In both sexes, gonadal magnesium concentrations did not change with increasing tissue burdens of copper and cadmium, but instead rose initially in proportion to the degree of metal exposure, homeostasis being maintained thereafter.

Journal

Marine Biology – Springer Journals

Published: Feb 1, 1988

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