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Title

Assessing juvenile swordfish (Xiphias gladius) diet as an indicator of marine ecosystem changes in the northwestern Mediterranean Sea

AuthorsFernández Corredor, Elena CSIC ORCID; Francotte, Luca; Martino, Ilaria; Fernández-Álvarez, Fernando Ángel CSIC ORCID; García-Barcelona, Salvador; Macías, David; Coll, Marta CSIC ORCID ; Ramírez Benítez, Francisco CSIC ORCID CVN ; Navarro, Joan CSIC ORCID ; Giménez, Joan CSIC ORCID
KeywordsSwordfish
Cephalopods
Gelatinous organisms
Ecosystem change
Marine ecology
Large pelagic fish
Stable isotopes
Stomach content analysis
Trophic ecology
Mediterranean Sea
Issue DateNov-2023
PublisherElsevier
CitationMarine Environmental Research 192: 106190 (2023)
AbstractTo preserve marine biodiversity, we need reliable early warning indicators that inform changes in marine ecosystems. As reliable samplers of mid-trophic level communities, studying the trophodynamics of large pelagic fish can contribute to monitoring these changes. Here, we combined stomach content and stable isotope analyses to reconstruct the diet of juvenile swordfish (Xiphias gladius) in the northwestern Mediterranean Sea, in a time-lapse of almost a decade (2012 and 2020). Overall, our study showed that swordfish fed on a wide range of fish and cephalopod species from both pelagic and demersal habitats. A dietary shift towards increasing consumption of cephalopods and decreasing consumption of Gadiformes had been observed between 2012 and 2020. Stable isotope approaches revealed that gelatinous organisms were also important prey, particularly for smaller-sized swordfish. We underline the importance of combining multiple and complementary approaches to better reconstruct the diet of generalist species. Our findings highlight the generalist and opportunistic diet of Mediterranean swordfish, which makes them good candidates for monitoring changes in the ecosystem
DescriptionThis study is a contribution of the ICM-TEF (Trophic Ecology Facility of the Institut de Ciències del Mar, CSIC).-- 11 pages, 6 figures, 2 tables, supplementary data https://doi.org/10.1016/j.marenvres.2023.106190.-- Data availability: Data will be made available on request
Publisher version (URL)https://doi.org/10.1016/j.marenvres.2023.106190
URIhttp://hdl.handle.net/10261/338869
DOI10.1016/j.marenvres.2023.106190
ISSN0141-1136
E-ISSN1879-0291
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(IEO) Artículos




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