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Oceanic phytoplankton structure off western Patagonia during the austral summer: implications for harmful algal blooms

dc.contributor.authorCorredor-Acosta, Andrea
dc.contributor.authorGalán, Alexander
dc.contributor.authorSaldías, Gonzalo S.
dc.contributor.authorMardones, Jorge I.
dc.contributor.authorMedellín-Mora, Johanna
dc.contributor.authorFrangopulos, Máximo
dc.contributor.authorShiozaki, Takuhei
dc.contributor.authorHarada, Naomi
dc.contributor.authorGonzález, Humberto E.
dc.contributor.authorIriarte, José L.
dc.date.accessioned2025-04-23T19:35:57Z
dc.date.available2025-04-23T19:35:57Z
dc.date.issued2025
dc.identifier.urihttp://repositorio.ucm.cl/handle/ucm/5977
dc.description.abstractChanges in phytoplankton composition and abundance are controlled by multiple factors, including physical forcing and nutrient stoichiometry. This study seeks to assess the interplay between the environmental and biogeochemical conditions in shaping the phytoplankton community structure in open ocean waters off western Patagonia. For this purpose, we used biological, hydrographic, and chemical data measured aboard the R/V Mirai during the austral summer of 2017, combined with remote sensing and reanalysis products. Although no first-order predictive relationships were found between the environmental and biological data, the results showed a latitudinal gradient of the phytoplankton structure, favoring maximum abundances of diatoms (∼10x104 cells L-1) in the northern area (∼43-48°S) characterized by high stratification and freshwater content. The high diatom abundances of Thalassiosira spp., Chaetoceros spp., Pseudo-nitzschia cf. australis and Pseudo-nitzschia cf. pseudodelicatissima taxa in this area results in a nutrient content decreases (nitrate < 9 μmol kg−1, phosphate < 0.9 μmol kg−1, silicic acid < 1.5 μmol kg−1), and low N:Si (<8) and N:P (<10) ratios. Nonetheless, the total dinoflagellates abundance was equal to or higher than those of diatoms (∼10.2x104 cells L-1) throughout most of the sampling region. Specifically, maximum abundances (∼6.3x104 cells L-1) of Karenia spp. were found in the north under the freshwater influence from the Gulf of Penas, where the highest ammonium:nitrate ratio (∼4 to 11.5) was recorded. In contrast, high dinoflagellate abundances of Azadinium spp. were found in the south (∼48-55°S), where an increase of nutrient content (nitrate ∼12μmol kg-1, phosphate ∼1 μmol kg-1, ammonium ∼0.4 μmol kg-1), and high N:Si and N:P ratios (∼35 and ∼12) were observed. This study highlights a major presence of potentially toxic phytoplankton species in the oceanic zone off northern Patagonia under conditions of strong latitudinal and cross-shore gradients in nutrient content and salinity, related to the interplay between oceanic water masses and freshwater input.es_CL
dc.language.isoenes_CL
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
dc.sourceProgress in Oceanography, 231, 103409es_CL
dc.subjectCabo de Hornos Currentes_CL
dc.subjectWestern Patagoniaes_CL
dc.subjectPhytoplankton community structurees_CL
dc.subjectNutrient contenes_CL
dc.subjectNutrient stoichiometryes_CL
dc.subjectFreshwater dischargees_CL
dc.subjectInshore-offshorees_CL
dc.subjectParticulate Organic Carbones_CL
dc.titleOceanic phytoplankton structure off western Patagonia during the austral summer: implications for harmful algal bloomses_CL
dc.typeArticlees_CL
dc.ucm.facultadFacultad de Ciencias de la Ingenieríaes_CL
dc.ucm.indexacionScopuses_CL
dc.ucm.indexacionIsies_CL
dc.ucm.urisciencedirect.ucm.elogim.com/science/article/pii/S0079661124002155?via%3Dihubes_CL
dc.ucm.doidoi.org/10.1016/j.pocean.2024.103409es_CL


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Atribución-NoComercial-SinDerivadas 3.0 Chile
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