Comparison of secondary ion mass spectrometry and micromilling/continuous flow isotope ratio mass spectrometry techniques used to acquire intra-otolith δ18O values of wild Atlantic salmon (Salmo salar)

Hanson, N.N., Wurster, C.M., EIMF, , and Todd, C.D. (2010) Comparison of secondary ion mass spectrometry and micromilling/continuous flow isotope ratio mass spectrometry techniques used to acquire intra-otolith δ18O values of wild Atlantic salmon (Salmo salar). Rapid Communications in Mass Spectrometry, 24 (17). pp. 2491-2498.

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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 δ18O 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 δ18O values and analytical precisions (∼0.2‰) of the two methods were comparable. In addition, SIMS δ18O results were used to compare otolith aragonite values with predicted values calculated using various isotope fractionation equations.

Item ID: 15658
Item Type: Article (Research - C1)
ISSN: 1097-0231
Additional Information:

EIMF (Edinburgh Ion Microprobe Facility)

Date Deposited: 15 Mar 2011 05:59
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830201 Fisheries Recreational @ 100%
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