Cathodoluminescence Microscopy: A Useful Tool for Assessing Incremental Chemical Variation in Otoliths |
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| Authors: | Norman M Halden Karen Mathers John A Babaluk Sergio R Mejia |
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| Institution: | (1) Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada;(2) TetrES Environmental Consultants Inc., 603-386 Broadway Avenue, Winnipeg, MB, R3C 3R6, Canada;(3) Fisheries and Ocean Canada, 501 University Crescent, Winnipeg, MB, R3T 2N6, Canada |
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| Abstract: | Otoliths taken from fish from Eden Lake, Manitoba show yellow–green and red cathodoluminescence of varying intensity that corresponds to their annular structure. Proton-induced X-ray emission analysis shows manganese (Mn) concentrations of between 2 and 205 ppm, zinc (Zn) concentrations between 2 and 290ppm and strontium (Sr) concentrations up to 1500ppm in the otoliths. The distribution of luminescence correlates with the distribution of Mn. The Mn, Zn and Sr are likely derived from the monzonitic rocks surrounding the lake. Variations in the distribution of cathodoluminescence may be a useful tool for evaluating changes in environmental chemistry and fish life histories. |
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| Keywords: | otolith life history trace elements PIXE environmental chemistry |
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