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Often stemming from the overlap between food resources and fishery target species, dietary analysis is key to understanding bycatch patterns. In the Bay of Biscay, common dolphin (\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Delphinus delphis<\/jats:italic>\n                    <\/jats:styled-content>\n                    ) bycatch has strongly increased since 2016. Addressing the potential trophic relationship between dolphins and fisheries is essential for developing effective conservation strategies to ensure the sustainability of both dolphin populations and fisheries. Using stomach content analysis, we investigated temporal changes in the occurrence, abundance, and importance by mass of prey between 1999 and 2019. We found no difference in overall diet over time, still composed of pelagic energy\u2010rich prey (pilchards\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Sardina pilchardus<\/jats:italic>\n                    <\/jats:styled-content>\n                    ; horse mackerel\n                    <jats:italic>Trachurus<\/jats:italic>\n                    spp. and anchovy\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Engraulis encrasicolus<\/jats:italic>\n                    <\/jats:styled-content>\n                    ). However, we observed a significant decrease in the importance by mass of horse mackerel (\n                    <jats:italic>t<\/jats:italic>\n                    \u2009=\u20092.8365,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.01) and an increase in anchovy (\n                    <jats:italic>t<\/jats:italic>\n                    \u2009=\u2009\u22124.2636,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.01), as well as a decrease in the average size of major species, mainly related to environmental variations in abundance and size distribution of the small pelagic fish. We also identified a shift in minor species from upper slope habitats (e.g., blue whiting\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Micromesistius poutassou<\/jats:italic>\n                    <\/jats:styled-content>\n                    ) to species inhabiting coastal waters (e.g., sprat\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Sprattus sprattus<\/jats:italic>\n                    <\/jats:styled-content>\n                    ), reflecting changes in the distribution of common dolphins within the Bay of Biscay. Finally, we highlighted the consistency over time in the prevalence of fresh pilchards and anchovies in the dolphin stomachs, suggesting they are more likely to feed specifically on these species when bycatch occurs. The risk of bycatch may therefore be increased by dolphins targeting pilchards and anchovies in more coastal waters.\n                  <\/jats:p>","DOI":"10.1002\/ece3.71815","type":"journal-article","created":{"date-parts":[[2025,7,18]],"date-time":"2025-07-18T08:10:20Z","timestamp":1752826220000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Long\u2010Term Changes in the Winter Diet of Common Dolphins Reflects Ecological Shifts and Bycatch Dynamics in the Bay of Biscay"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8735-5987","authenticated-orcid":false,"given":"Johanna","family":"Faure","sequence":"first","affiliation":[{"name":"Observatoire Pelagis UAR 3462 CNRS \u2013 La Rochelle Universit\u00e9  La Rochelle France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jasmin","family":"Niol","sequence":"additional","affiliation":[{"name":"Observatoire Pelagis UAR 3462 CNRS \u2013 La Rochelle Universit\u00e9  La Rochelle France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"El\u00e9onore","family":"Meheust","sequence":"additional","affiliation":[{"name":"Observatoire Pelagis UAR 3462 CNRS \u2013 La Rochelle Universit\u00e9  La Rochelle France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00e9r\u00f4me","family":"Spitz","sequence":"additional","affiliation":[{"name":"Observatoire Pelagis UAR 3462 CNRS \u2013 La Rochelle Universit\u00e9  La Rochelle France"},{"name":"Centre D'etudes Biologiques de Chiz\u00e9 (CEBC) UMR 7372 CNRS \u2013 La Rochelle Universit\u00e9  Villiers\u2010en\u2010Bois France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,7,18]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365\u20102419.2001.00164.x"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/jfb.14151"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.biocon.2018.02.021"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.biocon.2021.108975"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0060353"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-12-805068-2.00006-1"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365\u20102419.2008.00494.x"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1748\u20107692.2012.00604.x"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10641\u2010011\u20109959\u2010z"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fishres.2017.08.003"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/icesjms\/fsad197"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.3354\/cr00914"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2021.149622"},{"key":"e_1_2_10_15_1","volume-title":"A Handbook for the Identification of Cephalopod Beaks","author":"Clarke M. 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