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Helminthol."],"published-print":{"date-parts":[[2025]]},"abstract":"<jats:title>Abstract<\/jats:title>\n\t  <jats:p>Biological invasions are among the main threats to global biodiversity and present the potential to disrupt host-parasite dynamics. In Brazil, the scientific reports of the occurrence of the Amazonian fish \u2018pirarucu\u2019 (<jats:italic>Arapaima gigas<\/jats:italic>) in the upper Paran\u00e1 River basin, S\u00e3o Paulo state, were made in 2015. However, the effects of its introduction are still unknown, including those associated to its host-parasite relationships. As part of our studies on the possible effects of <jats:italic>A. gigas<\/jats:italic> introduction into this basin, the parasites from the eyes of 60 specimens of <jats:italic>A. gigas<\/jats:italic> were evaluated. We reported the occurrence of <jats:italic>Austrodiplostomum compactum<\/jats:italic> metacercariae (Trematoda, Diplostomidae) parasitizing the eyes of <jats:italic>A. gigas<\/jats:italic> supported by morphological and molecular data (COI mtDNA). The new partial sequences had a similarity of 100% to other sequences of <jats:italic>Au. compactum<\/jats:italic> previously deposited in Genbank. Five hosts (Prevalence = 8.33%) with a standard length between 69 and 116 cm were infected, with a mean intensity of infection of 31.8 \u00b1 17.2 (1\u201393). Large infected hosts are unlikely to be a significant prey item for the definitive hosts (medium-sized piscivorous birds), and could act as an \u2018ecological sink\u2019, disrupting the transmission of this metacercariae. Hosts with high infection rates by these metacercariae may present cataracts, exophthalmos, and blindness, resulting in loss of visual acuity. Considering that <jats:italic>A. gigas<\/jats:italic> is a carnivorous and visual predator, the low infection observed possibly does not act as a biological filter to hinder or contain the invasion, probably presenting a low negative effect on the visual acuity of hosts.<\/jats:p>","DOI":"10.1017\/s0022149x25000045","type":"journal-article","created":{"date-parts":[[2025,2,17]],"date-time":"2025-02-17T08:02:07Z","timestamp":1739779327000},"source":"Crossref","is-referenced-by-count":1,"title":["Eye metacercariae in invasive pirarucu <i>Arapaima gigas<\/i> (Pisces: Arapaimidae): A potential ecological sink interaction?"],"prefix":"10.1017","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4733-4820","authenticated-orcid":false,"given":"L.","family":"Franceschini","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-9173-3163","authenticated-orcid":false,"given":"F.G.C.","family":"Dias","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2370-7549","authenticated-orcid":false,"given":"B.S.","family":"Miguel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6208-0286","authenticated-orcid":false,"given":"A.C.","family":"Zago","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9545-4985","authenticated-orcid":false,"given":"M.L.","family":"Orsi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6543-7439","authenticated-orcid":false,"given":"J.R.S.","family":"Vitule","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0130-5047","authenticated-orcid":false,"given":"F.S.","family":"de Almeida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8845-3845","authenticated-orcid":false,"given":"F.","family":"Porto-Foresti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4006-1353","authenticated-orcid":false,"given":"J.A.","family":"Balbuena","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4525-6491","authenticated-orcid":false,"given":"I.P.","family":"Ramos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2966-0905","authenticated-orcid":false,"given":"L.","family":"Casatti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2025,2,17]]},"reference":[{"key":"S0022149X25000045_r56","doi-asserted-by":"publisher","DOI":"10.1007\/s00436-011-2311-x"},{"key":"S0022149X25000045_r29","first-page":"222","article-title":"Neglected wildlife: Parasitic biodiversity as a conservation target","volume":"2","author":"G\u00f3mez","year":"2013","journal-title":"International Journal for Parasitology: Parasites and Wildlife"},{"key":"S0022149X25000045_r32","doi-asserted-by":"publisher","DOI":"10.1093\/sysbio\/syq010"},{"key":"S0022149X25000045_r68","doi-asserted-by":"publisher","DOI":"10.1093\/molbev\/msn083"},{"key":"S0022149X25000045_r86","first-page":"475","article-title":"Metacerc\u00e1rias de Diplostomum (Austrodiplostomum) compactum Lutz, 1928 (Digenea, Diplostomidae) em peixes do rio Paran\u00e1, Brasil. 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