Abstract
Feeding habits and habitat use inform ecosystem-based management strategies for commercial fish species. A consumer’s diet can be assessed through stomach content analysis (SCA), bulk stable isotope analysis (BSIA) and compound-specific stable isotope analysis of amino acids (CSIA-AA). Our research establishes the first approach combining these traditional and novel techniques to provide insight on the movements and trophic ecology of dolphinfish (Coryphaena hippurus) in the Mexican Central Pacific (MCP) during 2013. Dolphinfish SCA (n = 311), muscle δ15N and δ13C BSIA (n = 148), and δ15N CSIA-AA (n = 9) were performed to assess trophic and movement patterns. Diet was composed of 59 prey items. According to the Prey-Specific Index of Relative Importance, the main prey were Argonauta spp. (24%), Portunus xantusii (11%), Dosidicus gigas (7%), and Selar crumenophthalmus (7%). Diet differed between seasons and age class but not by sex. Trophic position did not change with body size based on SCA or SIA with average estimates of 3.5, 4.1, and 4.3 based on BSIA, CSIA, and SCA, respectively. Adult dolphinfish showed a shift in their isotopic niche; bulk δ15N values varied widely in adults (⁓ 10‰) suggesting movements through different isoscapes while juveniles had more constrained values consistent with residency within the regional isoscapes. These results were supported by differences in source amino acid δ15N mean values between juveniles (4.6‰) and adults (0.8‰). Our findings suggest that the MCP is a migration corridor for dolphinfish between foraging areas across the Eastern Tropical Pacific.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are grateful to the sampling team at the Universidad de Guadalajara who collected the samples in the Mexican Central Pacific. We would like to thank Instituto Politecnico Nacional for fellowships (COFAA, EDI). We thank the institutions providing grants that made possible this research (CONACYT, BEIFI, COFAA, SAI, Universidad de Guadalajara). Thanks to the institutions and their personal analyzing our samples at IPN and CSIC. Special thanks to NIWA for providing a space and materials to develop this research, to their laboratory staff, Andrew Kingston, and Julie Brown for the assistance in analyzing samples, and to Malcolm Francis for advice.
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Our research was funding by CONACYT with the Grant 253700 and IPN-SIP with the Grants 20160084 and 20170563.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SAB-H, AVB-C, VHG-P, and BA-P. The first draft of the manuscript was written by SAB-H and all authors (SAB-H, VHG-P, BA-P, FRE-V, AVB-C, AD-H, BSG, JML, and FG-M, commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Briones-Hernández, S.A., Galván-Piña, V.H., Aguilar-Palomino, B. et al. Movements and trophic ecology of dolphinfish (Coryphaena hippurus) in the Mexican Central Pacific inferred from stomach content, bulk, and compound-specific stable isotope analyses. Mar Biol 170, 88 (2023). https://doi.org/10.1007/s00227-023-04217-0
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DOI: https://doi.org/10.1007/s00227-023-04217-0