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A total of 12,019 individuals (TL ranging from 60 to 287\u00a0mm) were counted and measured on an eel ladder at Coimbra weir, 44\u00a0km upstream from the river mouth, during their upstream movements. Although eels were counted throughout the year, a clear seasonal peak was detected in spring and late summer, with 93% of total movements occurring between April and September. No differences were found in the total length of individuals moving upstream between years. Generalised additive models, with an explained deviance of 83% and an adjusted <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> of 0.88, identified minimum water temperature as the main environmental variable explaining these movements, with a threshold of 13\u00a0\u00b0C triggering the onset of movements, and a peak between 15 and 19\u00a0\u00b0C, which corresponds to the spring and summer periods. Other predictors such as photoperiod, precipitation and river flow also contributed as explanatory variables in the model but less importantly. The present results may contribute to the management of this endangered species in the southern region of its distribution range by defining adequate temporal windows to monitor and promote the movement of juvenile European eels through obstacles to migration.<\/jats:p>","DOI":"10.1007\/s10641-023-01417-x","type":"journal-article","created":{"date-parts":[[2023,5,8]],"date-time":"2023-05-08T12:02:45Z","timestamp":1683547365000},"page":"1313-1325","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Upstream movement of juvenile eels (Anguilla anguilla L.) in a southwestern European river"],"prefix":"10.1007","volume":"106","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6130-8063","authenticated-orcid":false,"given":"Rui M.","family":"Monteiro","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0795-5614","authenticated-orcid":false,"given":"Isabel","family":"Domingos","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2776-5420","authenticated-orcid":false,"given":"Pedro R.","family":"Almeida","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3843-4635","authenticated-orcid":false,"given":"Jos\u00e9 L.","family":"Costa","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2863-6575","authenticated-orcid":false,"given":"Esmeralda","family":"Pereira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4878-7768","authenticated-orcid":false,"given":"Ana F.","family":"Belo","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5223-6355","authenticated-orcid":false,"given":"Teresa","family":"Portela","sequence":"additional","affiliation":[]},{"given":"Ana","family":"Telhado","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0509-4515","authenticated-orcid":false,"given":"Bernardo R.","family":"Quintella","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,5,8]]},"reference":[{"key":"1417_CR1","doi-asserted-by":"publisher","first-page":"1985","DOI":"10.1111\/j.1095-8649.2009.02288.x","volume":"74","author":"A Acou","year":"2009","unstructured":"Acou A, Legault A, Laffaille P, Feunteun E (2009) Environmental determinism of year-to-year recruitment variability of European eel Anguilla anguilla in a small coastal catchment, the Fr\u00e9mur River, north-west France. 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Chapman and Hall\/CRC, New York","DOI":"10.1201\/9781315370279"}],"container-title":["Environmental Biology of Fishes"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1007\/s10641-023-01417-x.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1007\/s10641-023-01417-x\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1007\/s10641-023-01417-x.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,6,1]],"date-time":"2023-06-01T00:02:45Z","timestamp":1685577765000},"score":1,"resource":{"primary":{"URL":"https:\/\/link.springer.com\/10.1007\/s10641-023-01417-x"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,5,8]]},"references-count":48,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2023,6]]}},"alternative-id":["1417"],"URL":"https:\/\/doi.org\/10.1007\/s10641-023-01417-x","relation":{},"ISSN":["0378-1909","1573-5133"],"issn-type":[{"value":"0378-1909","type":"print"},{"value":"1573-5133","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,5,8]]},"assertion":[{"value":"1 August 2022","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"14 April 2023","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"8 May 2023","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study was carried out in strict accordance with the recommendations present in the Guide for the Care and Use of Laboratory Animals of the European Union 62\/2010\u2014in Portugal under DL no. 129\/92, Portaria no. 1005\/92 and DL 113\/2013. Individual permissions to collect specimens were provided by the Institute for Nature Conservation and Forestry, I.P. (ICNF, IP).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}