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Individuals of GS can regularly disperse towards southern areas (ca. 38\u00b0N\u201339\u00b0N) but occurrence at lower latitudes is exceptional. On 18 February 2022, a 217-cm-long male of GS was detected in waters off the SW Atlantic coast of Spain (37\u00b0N), then entered the western Mediterranean Sea and wandered for 15 days until he died. Here, we use gastrointestinal parasites to investigate the geographical origin of the GS and the length of the journey towards Mediterranean waters. Seven helminth taxa were found, namely, the digeneans\n                    <jats:italic>Ascocotyle septentrionalis<\/jats:italic>\n                    and\n                    <jats:italic>Cryptocoyle lingua<\/jats:italic>\n                    , the nematodes\n                    <jats:italic>Contracaecum osculatum<\/jats:italic>\n                    s.s.,\n                    <jats:italic>Anisakis simplex<\/jats:italic>\n                    s.s., and\n                    <jats:italic>A. pegreffii<\/jats:italic>\n                    , and the acanthocephalans\n                    <jats:italic>Corynosoma<\/jats:italic>\n                    sp.1 and\n                    <jats:italic>C. magdaleni<\/jats:italic>\n                    (=\n                    <jats:italic>strumosum<\/jats:italic>\n                    ) or\n                    <jats:italic>C. nortmeri.<\/jats:italic>\n                    The parasite composition closely resembles that reported in native harbour seals (\n                    <jats:italic>Phoca vitulina<\/jats:italic>\n                    ) of the Wadden Sea (ca. 51\u00b0\u201355\u00b0N), from where\n                    <jats:italic>A. septentrionalis<\/jats:italic>\n                    is apparently endemic. Considering that (i)\n                    <jats:italic>A. septentrionalis<\/jats:italic>\n                    cannot be acquired out of the Wadden Sea, and (ii) the lifespan and population structure of the parasites found, we infer that the GS came from waters near the Wadden Sea, and the length of the journey was ca. 1 month, with presumably little ingestion of (parasitized) food. To our knowledge, this is the first study using parasites to unveil the geographical mobility of pinnipeds.\n                  <\/jats:p>","DOI":"10.1017\/s0022149x26101345","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T06:16:30Z","timestamp":1776060990000},"source":"Crossref","is-referenced-by-count":1,"title":["Far away from home: gastrointestinal parasites trace the journey of a grey seal (\n                    <i>Halichoerus grypus<\/i>\n                    ) from the Wadden Sea to the Mediterranean Sea"],"prefix":"10.1017","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9101-3063","authenticated-orcid":false,"given":"C.","family":"Pons-Bordas","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/043nxc105","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Valencia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5139-3885","authenticated-orcid":false,"given":"A.","family":"Garc\u00eda-Gallego","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/043nxc105","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Valencia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.d.M.","family":"Palacios Otero","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/043nxc105","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Valencia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.J.","family":"Aznar","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/043nxc105","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Valencia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2026,4,13]]},"reference":[{"key":"S0022149X26101345_r122","first-page":"1","article-title":"Fortsetzung der Beobachtungen \u00fcber die Eingeweidew\u00fcrmer","volume":"2","author":"Rudolphi","year":"1802","journal-title":"Archivio Zoologico Italiano e di Zootecnia"},{"key":"S0022149X26101345_r38","first-page":"1","article-title":"Contribution to the knowledge of echinorhynchs of fishes in Finland","volume":"27","author":"Forssell","year":"1905","journal-title":"Acta Societatis pro Fauna et Flora Fennica"},{"key":"S0022149X26101345_r93","doi-asserted-by":"publisher","DOI":"10.1016\/bs.apar.2017.12.001"},{"key":"S0022149X26101345_r35","first-page":"1","article-title":"Systematic position and delimitation of ascaridoid nematode parasites of the genus Contracaecum with a note on the superfamily Ascaridoidea","volume":"50","author":"Fagerholm","year":"1990","journal-title":"Acta Academiae Aborensis"},{"key":"S0022149X26101345_r58","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182001008423"},{"key":"S0022149X26101345_r75","unstructured":"Leidenberger, S , B\u00e4cklin, BM (2008) Species Determination and Distribution of Parasites of Grey Seals (Halichoerus grypus) with Intestinal Ulcers in Sweden. 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