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MEPS
Marine Ecology Progress Series

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MEPS 657:161-172 (2021)  -  DOI: https://doi.org/10.3354/meps13525

Isotopic characterization of lifetime movement by two demersal fishes from the northeastern Gulf of Mexico

Julie L. Vecchio1,2,*, Jenny L. Ostroff1,3, Ernst B. Peebles1

1College of Marine Science, University of South Florida, 830 1st St South, St. Petersburg, FL 33701, USA
2Present address: Florida Fish and Wildlife Research Institute, 100 8th Avenue SE, St. Petersburg, FL 33701, USA
3Present address: NOAA Fisheries, 263 13th Ave S, St. Petersburg, FL 33701, USA
*Corresponding author:

ABSTRACT: An understanding of lifetime trophic changes and ontogenetic habitat shifts is essential to the preservation of marine fish species. We used carbon and nitrogen stable isotope values (δ13C and δ15N) recorded within the laminar structure of fish eye lenses, reflecting both diet and location over time, to compare the lifetime trends of 2 demersal mesopredators. Tilefish Lopholatilus chamaeleonticeps inhabit burrows on the outer continental shelf, which results in exceptional site fidelity. Red grouper Epinephelus morio are spawned on the middle to outer continental shelf, move to the inner shelf for the juvenile period, and return offshore upon sexual maturity. Both species inhabit the eastern Gulf of Mexico, a region with a distinctive offshore-inshore gradient in background δ13C values. Within individual tilefish (n = 36), sequences of δ13C values and δ15N values had strong, positive correlations with eye-lens diameter, and strong correlations between the 2 isotopes (mean Spearman r = 0.86), reflecting an increase in trophic position with growth and little lifetime movement. In red grouper (n = 30), δ15N values positively correlated with eye-lens diameter, but correlations between δ15N and δ13C were weak (mean Spearman r = 0.29), suggesting cross-shelf ontogenetic movements. Linear mixed model results indicated strong relationships between δ15N and δ13C values in tilefish eye lenses but no convergence in the red grouper model. Collectively, these results are consistent with previously established differences in the life histories of the 2 species, demonstrating the potential utility of eye-lens isotope records, particularly for investigating the life histories of lesser-known species.


KEY WORDS: Stable isotopes · Fish eye lenses · Fish movement · δ13C · δ15N · Trophic growth


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Cite this article as: Vecchio JL, Ostroff JL, Peebles EB (2021) Isotopic characterization of lifetime movement by two demersal fishes from the northeastern Gulf of Mexico. Mar Ecol Prog Ser 657:161-172. https://doi.org/10.3354/meps13525

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