Origin, trophic transfer and recycling of particulate organic matter in two upwelling bays of Humboldt Current System: Insights from compound-specific isotopic compositions of amino acids

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dc.contributor.authorSrain, Benjamin
dc.contributor.authorFlores, Edgart
dc.contributor.authorValdes, Jorge
dc.contributor.authorCamano, Andres
dc.date.accessioned2026-08-28T01:51:13Z
dc.date.available2026-08-28T01:51:13Z
dc.date.issued2025
dc.description.abstractThe Chilean upwelling bays are highly productive ecosystems shaped by their inter-actions with the open ocean. Although significant knowledge exists regarding their hydrodynamic and ecological processes, the spatial dynamics of trophic transfer and heterotrophic resynthesis of organic matter remain insufficiently understood. To address these knowledge gaps, we conducted a compound-specific isotope analysis of amino acids (CSIAA) on suspended and sinking particulate organic matter from Mejillones and Antofagasta bays, two oceanographic environments characterized by contrasting hydrodynamic conditions and topographic orientations. In Mejillones Bay, the CSIAA trophic positions for metazoan (1.7 ± 0.5) and protozoan (2.3 ± 0.3) were significantly higher compared to those in Antofagasta Bay (metazoans: 1.3 ± 0.6; protozoans: 1.5 ± 0.3), highlighting protozoans as primary trophic vectors. MixSIAR analysis indicated that phytoplankton is a key source of particulate organic matter in both bays; however, Mejillones Bay exhibited a greater proportion of microbially degraded organic matter. Enhanced heterotrophic resynthesis in Mejillones Bay (ΣV: 1.9–2.5) was associated with lower oxygen levels, increased concentrations of NO₂⁻ , and heightened stratification of the water column. Additionally, depth-dependent variations in δ15N for phenylalanine and threonine indicated a greater solubilization of particles, which contributed to a reduction in the export of particulate organic matter (averaging 9 ± 2 mg C/m²/d). These findings underscore the critical role of the intricate interactions between the bay’s topographic features and the physical and biological processes that ultimately influence the cycling trajectories of particulate organic mat-ter in upwelling bays
dc.description.sponsorshipAsociacion de Industriales de Mejillones [CR 4800]
dc.identifier.doi10.1371/journal.pone.0306674
dc.identifier.issn1932-6203
dc.identifier.urihttps://repositorioabierto.uantof.cl/handle/uantof/738
dc.language.isoen
dc.publisherPublic Library of Science (PLOS)
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourcePLOS ONE
dc.titleOrigin, trophic transfer and recycling of particulate organic matter in two upwelling bays of Humboldt Current System: Insights from compound-specific isotopic compositions of amino acids
dc.typeArticle
oaire.citation.volume20
oaire.citationIssue5
organization.identifier.rorhttps://ror.org/04eyc6d95
organization.legalNameUniversidad de Antofagasta
uantof.identificator.facultyFacultad de Ciencias del Mar y Recursos Biológicos
uantof.identificator.instituteInstituto de Ciencias Naturales Alexander von Humboldt
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Instituto de Ciencias Naturales Alexander von Humboldt