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- Title
WHOLE-BODY SODIUM CONCENTRATION IN LARVAL FATHEAD MINNOWS (PIMEPHALES PROMELAS) DURING AND FOLLOWING COPPER EXPOSURE.
- Authors
Zahner, Holly M.; Vangenderen, Eric J.; Tomasso, Joseph R.; Klaine, Stephen J.
- Abstract
This research used whole-body sodium concentration to characterize exposure and recovery of larval fathead minnows (Pimephales promelas) from acute pulsed copper exposures. Whole-body sodium was chosen because the acute mechanism of copper toxicity to fishes is putative disruption of ion regulation, resulting in a loss of sodium and eventually leading to mortality. Whole-body sodium response in larval fathead minnows exposed to copper was both concentration and duration dependent. The loss of sodium to approximately 70% of control levels occurred within 12 h of exposure. Organisms demonstrated an ability to recover whole-body sodium within 48 h after exposure to concentrations below 0.47 µM Cu2+ for 3, 6, or 9 h. However, at higher concentrations, organisms required more than 48 h to recover. Whole-body sodium concentrations and mortality for all continuous exposures were strongly correlated. These results may facilitate development of a physiologically based model to predict the response of organisms to copper in receiving streams.
- Subjects
SODIUM; FATHEAD minnow; COPPER; IONS; TOXICITY testing; ORGANISMS; PIMEPHALES
- Publication
Environmental Toxicology & Chemistry, 2006, Vol 25, Issue 6, p1635
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1897/05-543R.1