Comparison of secondary ion mass spectrometry and micromilling/continuous flow isotope ratio mass spectrometry techniques used to acquire intra-otolith delta O-18 values of wild Atlantic salmon (Salmo salar)

EIMF, N. N. Hanson*, C. M. Wurster, C. D. Todd

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The chemical signals in the sequential layers of fish otoliths have the potential to provide fisheries biologists with temporal and spatial details of migration which are difficult to obtain without expensive tracking methods. Signal resolution depends, however, on the extraction technique used. We compared the use of mechanical micromilling and continuous flow isotope ratio mass spectrometry (CF-IRMS) methods with secondary ion mass spectrometry (SIMS) to obtain delta O-18 profiles from otoliths of wild Atlantic salmon (Salmo salar) and used these to corroborate the time of freshwater emigration of the juvenile with macroscopic patterns within the otolith. Both techniques showed the transition occurring at the same visible feature on the otolith, allowing future analyses to easily identify the juvenile (freshwater) versus adult (marine) life-stages. However, SIMS showed a rapid and abrupt transition whereas micromilling provided a less distinct signal. The number of samples that could be obtained per unit area sampled using SIMS was 2 to 3 times greater than that when using micromilling/CF-IRMS although the delta O-18 values and analytical precisions (similar to 0.2 parts per thousand) of the two methods were comparable. In addition, SIMS delta O-18 results were used to compare otolith aragonite values with predicted values calculated using various isotope fractionation equations. Copyright (C) 2010 John Wiley & Sons, Ltd.

Original languageEnglish
Pages (from-to)2491-2498
Number of pages8
JournalRapid communications in mass spectrometry
Volume24
Issue number17
DOIs
Publication statusPublished - Sep 2010

Keywords

  • COD GADUS-MORHUA
  • FISH OTOLITHS
  • ONCORHYNCHUS-NERKA
  • LIFE-HISTORY
  • OXYGEN
  • FRACTIONATION
  • TEMPERATURE
  • RESOLUTION
  • RECONSTRUCTION
  • DELTA-C-13

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