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Acclimation to Cu in fathead minnows: does age influence the response?
Marlo K Sellin1, Erik Tate-Boldt, Alan S Kolok
1Dodge Street 6001, Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182-0040, USA.
Aquatic Toxicology (Amsterdam, Netherlands)
|June 16, 2005
Summary
Larval fathead minnows acclimate to copper (Cu) faster than juveniles. Age affects copper acclimation time and mechanisms, with larvae showing a survival-to-whole-body sodium link, unlike juveniles.
Area of Science:
- Environmental toxicology
- Aquatic toxicology
- Fish physiology
Background:
- Copper (Cu) is a common aquatic contaminant.
- Organisms can acclimate to environmental stressors.
- Age-related differences in toxicant acclimation are not fully understood.
Purpose of the Study:
- To compare copper acclimation time in larval versus juvenile fathead minnows (Pimephales promelas).
- To investigate if survival-based acclimation aligns with whole-body sodium (Na+) levels.
- To explore age-dependent mechanisms of copper acclimation.
Main Methods:
- Conducted six experiments using larval and juvenile fathead minnows.
- Exposed fish to sublethal copper concentrations for varying durations.
- Assessed acclimation through survival tests at lethal copper doses.
- Measured whole-body sodium concentrations in exposed and control groups.
Main Results:
- Larval fathead minnows acclimated to copper after 4 days of sublethal exposure.
- Juveniles required 16 days of exposure to acclimate.
- Larval acclimation correlated with maintained whole-body sodium levels.
- Juvenile acclimation did not show a similar correlation with whole-body sodium.
Conclusions:
- Fathead minnow age significantly influences the duration required for copper acclimation.
- Age appears to affect the physiological mechanisms underlying copper acclimation.
- Survival and whole-body sodium may indicate different aspects of copper acclimation depending on life stage.