Abstract
Octopus insularis is an active and opportunistic predator, its diet depends on the habitat in which it develops and the abundance and distribution of the species it preys on. Despite its importance for fisheries, little is known about the trophic relationships of this octopus. For this reason, the main objective of this study was to describe its diet in the southern Gulf of Mexico combining stable δ13C and δ15N isotopes and stomach content analysis. Stable δ13C and δ15N isotope analysis were performed in muscle tissue of octopuses and their prey. In addition, stomachs were analyzed to identify consumed prey and to obtain percentages of numerical and gravimetric importance, the frequency of occurrence and the index of relative importance. The diet did not show differences between year, sex, or size. Eight crustacean and three fish genera were identified as the main components in the diet. Crustaceans appeared as the main prey group, and the most important prey within this group was Mithraculus sp., and for the fish group it was Anchoa sp. The isotope analysis indicates a high contribution to predator´s muscle tissue from both crustaceans and fish. In one hand, results indicate that crustaceans as prey are important for the octopus population in the whole distribution area. On the other hand, isotope values positioned O. insularis as an intermediate trophic level predator, placing it as an efficient vehicle of energy transfer between lower to higher trophic levels in the ecosystem.
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Acknowledgements
The authors thank Tecnológico Nacional de México and the Consejo Nacional de Ciencia y Tecnología for the support through the Cátedras program. RRL thanks the fisherman from the Cooperativa Arrecifes de Antón Lizardo of the Veracruz Reef System National Park for their support in the collection of samples. RRL is an active member of the Laboratorio Nacional de Micro y Nanofluidica (LabMyN- Laboratorios Nacionales 2020-314907).
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Financial support was provided by Tecnológico Nacional de México through the scientific program, project number: u619w8(3376).
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AUO contributed to analyzed samples and data, wrote the manuscript. AGJG was involved in analyzed data, authored or reviewed drafts of the paper. CAVS contributed to acquired samples in the field, authored or reviewed drafts of the paper. DIAR was involved in analyzed data and authored or reviewed drafts of the paper. RRL contributed to acquired samples in the field, analyzed samples and data, wrote the manuscript, and approved the final draft for publication.
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Urrutia-Olvera, A., Jordán-Garza, A.G., Villegas-Sánchez, C.A. et al. Prey contribution to the diet of Octopus insularis (Leite and Haimovici, 2008) using stable isotopes and stomach content analysis in the Western Gulf of Mexico. Aquat Ecol 55, 765–777 (2021). https://doi.org/10.1007/s10452-021-09859-0
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DOI: https://doi.org/10.1007/s10452-021-09859-0