{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T13:00:02Z","timestamp":1774011602979,"version":"3.50.1"},"reference-count":54,"publisher":"Copernicus GmbH","issue":"5","license":[{"start":{"date-parts":[[2017,3,13]],"date-time":"2017-03-13T00:00:00Z","timestamp":1489363200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biogeosciences"],"abstract":"<jats:p>Abstract. The objective of the current work is to improve our understanding of how water column diatom's abundance and assemblage composition is seasonally transferred from the photic zone to seafloor sediments. To address this, we used a dataset derived from water column, sediment trap and surface sediment samples recovered in the NW Iberian coastal upwelling system.  Diatom fluxes (2.2 (\u00b15.6) 106\u202fvalves\u202fm\u22122\u202fd\u22121) represented the majority of the siliceous microorganisms sinking out from the photic zone during all studied years and showed seasonal variability. Contrasting results between water column and sediment trap diatom abundances were found during downwelling periods, as shown by the unexpectedly high diatom export signals when diatom-derived primary production achieved their minimum levels. They were principally related to surface sediment remobilization and intense Minho and Douro river discharge that constitute an additional source of particulate matter to the inner continental shelf. In fact, contributions of allochthonous particles to the sinking material were confirmed by the significant increase of both benthic and freshwater diatoms in the sediment trap assemblage.  In contrast, we found that most of the living diatom species blooming during highly productive upwelling periods were dissolved during sinking, and only those resistant to dissolution and the Chaetoceros and Leptocylindrus\u00a0spp. resting spores were susceptible to being exported and buried. Furthermore, Chaetoceros\u00a0spp. dominate during spring\u2013early summer, when persistent northerly winds lead to the upwelling of nutrient-rich waters on the shelf, while Leptocylindrus\u00a0spp. appear associated with late-summer upwelling relaxation, characterized by water column stratification and nutrient depletion. These findings evidence that the contributions of these diatom genera to the sediment's total marine diatom assemblage should allow for the reconstruction of different past upwelling regimes.<\/jats:p>","DOI":"10.5194\/bg-14-1165-2017","type":"journal-article","created":{"date-parts":[[2017,3,13]],"date-time":"2017-03-13T05:27:44Z","timestamp":1489382864000},"page":"1165-1179","source":"Crossref","is-referenced-by-count":12,"title":["Diatoms as a paleoproductivity proxy in the NW Iberian coastal upwelling system (NE Atlantic)"],"prefix":"10.5194","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3597-8394","authenticated-orcid":false,"given":"Diana","family":"Z\u00fa\u00f1iga","sequence":"first","affiliation":[]},{"given":"Celia","family":"Santos","sequence":"additional","affiliation":[]},{"given":"Mar\u00eda","family":"Froj\u00e1n","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1000-2977","authenticated-orcid":false,"given":"Emilia","family":"Salgueiro","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0734-7491","authenticated-orcid":false,"given":"Marta M.","family":"Rufino","sequence":"additional","affiliation":[]},{"given":"Francisco","family":"De la Granda","sequence":"additional","affiliation":[]},{"given":"Francisco G.","family":"Figueiras","sequence":"additional","affiliation":[]},{"given":"Carmen G.","family":"Castro","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9110-0212","authenticated-orcid":false,"given":"F\u00e1tima","family":"Abrantes","sequence":"additional","affiliation":[]}],"member":"3145","published-online":{"date-parts":[[2017,3,13]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Abrantes, F.: Diatoms assemblages as upwelling indicators in surface sediments in Portugal, Mar. 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