Quantifying fish otolith mineralogy for trace-element chemistry studies

Otoliths are frequently used to infer environmental conditions or fish life history events based on trace-element concentrations. However, otoliths can be comprised of any one or combination of the three most common polymorphs of calcium carbonate—aragonite, calcite, and vaterite—which can affect th...

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Published in:Scientific reports 2022-02, Vol.12 (1), p.2727-2727, Article 2727
Main Authors: Wood, R. Seth, Chakoumakos, Bryan C., Fortner, Allison M., Gillies-Rector, Kat, Frontzek, Matthias D., Ivanov, Ilia N., Kah, Linda C., Kennedy, Brian, Pracheil, Brenda M.
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Language:English
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60 APPLIED LIFE SCIENCES
631/1647
631/535
704/158/2039
704/158/2466
704/158/672
animal migration
biological techniques
Calcite
Calcium carbonate
conservation biology
Environmental conditions
Humanities and Social Sciences
Life history
Mineralogy
multidisciplinary
Neutron diffraction
Oncorhynchus tshawytscha
Otoliths
Raman spectroscopy
Salmon
Science
Science (multidisciplinary)
stable isotope analysis
structural biology
Trace elements
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description Otoliths are frequently used to infer environmental conditions or fish life history events based on trace-element concentrations. However, otoliths can be comprised of any one or combination of the three most common polymorphs of calcium carbonate—aragonite, calcite, and vaterite—which can affect the ecological interpretation of otolith trace-element results. Previous studies have reported heterogeneous calcium carbonate compositions between left and right otoliths but did not provide quantitative assessments of polymorph abundances. In this study, neutron diffraction and Raman spectroscopy were used to identify and quantify mineralogical compositions of Chinook salmon Oncorhynchus tshawytscha otolith pairs. We found mineralogical compositions frequently differed between otoliths in a pair and accurate calcium carbonate polymorph identification was rarely possible by visual inspection alone. The prevalence of multiple polymorphs in otoliths is not well-understood, and future research should focus on identifying otolith compositions and investigate how variations in mineralogy affect trace-element incorporation and potentially bias environmental interpretations.
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subjects 60 APPLIED LIFE SCIENCES
631/1647
631/535
704/158/2039
704/158/2466
704/158/672
animal migration
biological techniques
Calcite
Calcium carbonate
conservation biology
Environmental conditions
Humanities and Social Sciences
Life history
Mineralogy
multidisciplinary
Neutron diffraction
Oncorhynchus tshawytscha
Otoliths
Raman spectroscopy
Salmon
Science
Science (multidisciplinary)
stable isotope analysis
structural biology
Trace elements
title Quantifying fish otolith mineralogy for trace-element chemistry studies
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