Preservation Effects on Stable Isotope Values of Archived Elasmobranch Fin Tissue

Published online on 21. October 2014

Preservation Effects on Stable Isotope Values of Archived Elasmobranch Fin Tissue: Comparisons between Frozen and Ethanol-Stored Samples

Jill A. Olin, Gregg R. Poulakis, Philip W. Stevens, Jacquelyn A. DeAngelo, Aaron T. Fisk

ABSTRACT:

Elasmobranch fin tissue has been sampled and archived for decades to support genetics research. However, these collections have the potential to provide additional information on the trophic ecology of and habitat use by elasmobranch species. The use of fin tissue is especially attractive considering the threatened status of many elasmobranchs and the call for limiting mortalities. Yet, the use of fin samples for stable isotope analysis requires either that (1) storage methods do not alter tissue isotope values or (2) any alterations in isotope composition that occur during storage are predictable. In this study, paired fin tissues sampled from Smalltooth Sawfish Pristis pectinata and cownose rays Rhinoptera spp. were stored frozen and in ethanol and were subsequently analyzed for carbon (δ¹³C) and nitrogen (δ¹⁵N) isotope ratios. Fin δ¹³C and δ¹⁵N values were highly correlated between treatments for both taxa (r² ≥ 0.80). For Smalltooth Sawfish, ethanol storage significantly increased fin δ¹³C values by 0.5 ± 0.1‰ (mean ± SE) and decreased fin δ¹⁵N values by 0.1 ± 0.1‰ relative to frozen samples; differences were similar for cownose rays (δ¹³C: 0.2 ± 0.2‰; δ¹⁵N: 0.2 ± 0.1‰) but were not significant. A range of approximately 3‰ for δ¹³C between treatments could have effects on data interpretation, suggesting the use of regressions for ethanol correction of δ¹³C values, although trends were comparable between frozen and ethanol-preserved samples without correction. Given the low variability in δ¹⁵N values, a correction is not warranted. For endangered species such as the Smalltooth Sawfish, stable isotope analysis of ethanol-archived fin samples can provide important information regarding habitat use and trophic ecology, with potential significance for conservation and management strategies. The general uniformity in isotope ratio shifts observed for archived samples between the two taxa suggests that these findings can be generalized across elasmobranch species.

Transactions of the American Fisheries Society, Volume 143, Issue 6, 2014
DOI: 10.1080/00028487.2014.954055

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