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Consequences of inappropriate criteria for accepting age estimates from otoliths, with a case study for a long-lived tropical reef fish

Citation

Marriot, RJ and Mapstone, BD, Consequences of inappropriate criteria for accepting age estimates from otoliths, with a case study for a long-lived tropical reef fish, Canadian Journal of Fisheries and Aquatic Sciences, 63, (1) pp. 1-16. ISSN 0706-652X (2006) [Refereed Article]

DOI: doi:10.1139/F05-202

Abstract

In this study, we showed that selenium (Se) deposition from metal smelters in Sudbury, Ontario, greatly reduces the bioassimilation of mercury (Hg) by aquatic biota throughout the food web. Concentrations of total and methyl mercury in tissues of zooplankton, mayflies (Stenonema femoratum), amphipods (Hyalella azteca), and young-of-the-year perch (Perca flavescens) were positively correlated with increasing distance from Sudbury smelters and inversely correlated with Se concentrations in lake water. Although concentrations of total Hg and total Se in tissues showed weak or no correlation in most of the studied aquatic species, methyl mercury and total Se showed much clearer inverse trends. Similar to the results of our previous study of muscle tissue from adult perch and walleye (Sander vitreus), these findings suggest that Se plays an important role in limiting the whole-body assimilation of Hg at lower levels of the aquatic food chain. High Se concentrations may force a preferential assimilation of the element over Hg through a competitive adsorption on binding sites. They may also restrict the solubility and availability of Hg to aquatic organisms or reduce the methylation of this metal in lakes. © 2005 NRC.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Freshwater Ecology
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Land and Water Management of environments not elsewhere classified
Author:Mapstone, BD (Professor Bruce Mapstone)
ID Code:48328
Year Published:2006
Web of Science® Times Cited:72
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2007-10-05
Last Modified:2007-10-05
Downloads:0

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