Use of performance indicators in evaluating chronic metal exposure in wild yellow perch (Perca flavescens)
| Autor: | Lisa N. Taylor, D. Gordon McDonald, Patrice Couture, Wendy J McFarlane, Greg G. Pyle |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Gills
Gill Health Toxicology and Mutagenesis Sodium chemistry.chemical_element Fresh Water Aquatic Science Acclimatization Lethal Dose 50 Animal science Animals Ecotoxicology Lactic Acid Swimming Ontario Analysis of Variance Perch biology Spectrophotometry Atomic biology.organism_classification Acute toxicity Fishery Percidae chemistry Perches Toxicity Energy Metabolism Copper Glycogen Water Pollutants Chemical |
| Zdroj: | Aquatic Toxicology. 67:371-385 |
| ISSN: | 0166-445X |
| DOI: | 10.1016/j.aquatox.2004.01.018 |
| Popis: | The objective of this study was to evaluate the effects of copper exposure on swimming performance and gill-binding characteristics of wild yellow perch (Perca flavescens), a species endemic to metal-contaminated lakes of the Sudbury region in northern Ontario. Yellow perch were collected from lakes varying in the degree of metal contamination (Cu = 1-21 microg/l), on two separate occasions for the investigation of swim performance and the analysis of gill-binding characteristics. Swim performance tests indicated that yellow perch from the contaminated lake had slightly greater endurance in a fixed velocity sprint test than fish from reference lakes, although the analysis of critical swimming speeds (U(crit)) did not reveal this same distinction between the groups. Differential sprint performance was in part due to differences in fish size within contaminated and reference lakes. Yellow perch from the contaminated lake also had higher resting levels of muscle glycogen and greater lactate production during high intensity exercise compared to yellow perch from the reference site. Acclimation occurred in the metal-contaminated yellow perch, as seen by the significantly elevated time to death (LT50) during an acutely lethal challenge to 600 microg Cu/l. However, gills from perch from the contaminated lake accumulated about three times more copper at death. In contrast, at a lower exposure range of water-copper (10-400 microg/l), the gills of fish from the contaminated lake tended to saturate with copper at lower concentrations than gills of fish from the reference lake (approximately 8 microg versus 23 microg Cu/g of gill tissue). In addition, perch from the contaminated lake exhibited a lower rate of sodium loss during the acute exposure to copper at approximately 10 to 600 microg Cu/l. This study suggests that the amount of copper bound to (or accumulated within) the gills may not be diagnostic of acute toxicity for wild yellow perch from metal-contaminated lakes. |
| Databáze: | OpenAIRE |
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