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Copper tolerance in fathead minnows: II. Maternal transfer
Elizabeth B Peake1, Jessica C Locke, Laura L Tierney
1Department of Biology, University of Nebraska at Omaha, Omaha, Nebraska 68182-0040, USA.
Environmental Toxicology and Chemistry
|February 11, 2004
Summary
Female fathead minnows maternally transfer copper tolerance to offspring. Larvae from copper-exposed mothers showed improved survival in toxic copper solutions compared to unexposed groups.
Area of Science:
- Environmental toxicology
- Aquatic toxicology
- Developmental toxicology
Background:
- Copper (Cu) is an essential micronutrient but toxic at elevated concentrations.
- Maternal transfer of tolerance can be a mechanism for offspring to cope with environmental stressors.
- Fathead minnows (Pimephales promelas) are a model organism for aquatic toxicology studies.
Purpose of the Study:
- To investigate whether maternal exposure to copper influences copper tolerance in fathead minnow offspring.
- To determine if copper tolerance is a transgenerational effect in Pimephales promelas.
Main Methods:
- Adult female fathead minnows were exposed to a sublethal concentration of copper (100 microg/L) for 5 days.
- Offspring (larvae) were produced by both exposed and unexposed (control) female groups.
- Larval survivorship was assessed in potentially lethal copper solutions.
Main Results:
- Larvae produced by copper-exposed mothers exhibited significantly greater survivorship in toxic copper solutions.
- This enhanced survival was observed when compared to larvae produced by control (unexposed) mothers.
- The findings indicate a maternal effect on offspring's tolerance to copper.
Conclusions:
- Maternal exposure to sublethal copper induces tolerance in fathead minnow offspring.
- This suggests a transgenerational adaptive response to copper contamination in aquatic environments.
- Understanding such mechanisms is crucial for assessing the ecological risk of heavy metals.