Vertically distinct sources modulate stable isotope signatures and distribution of Mesozooplankton in central Patagonia: The Golfo de Penas- Baker Channel connection and analogies with the Beagle Channel

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dc.contributor.authorCastro, Leonardo R.
dc.contributor.authorSoto-Mendoza, Samuel
dc.contributor.authorRiccialdelli, Luciana
dc.contributor.authorPresta, Maria L.
dc.contributor.authorBarrientos, Pamela
dc.contributor.authorGonzalez, Humberto E.
dc.contributor.authorDaneri, Giovanni
dc.contributor.authorGutierrez, Marcelo
dc.contributor.authorMontero, Paulina
dc.contributor.authorMasotti, Italo
dc.contributor.authorDiez, Beatriz
dc.date.accessioned2025-01-20T17:12:02Z
dc.date.available2025-01-20T17:12:02Z
dc.date.issued2024
dc.description.abstractUsing hydrographic and zooplankton sampling along with stable isotope analyses, we determined the influence of freshwater input and of oceanic water ingress at the Golfo de Penas to the Baker Channel (47 degrees S), central Patagonia, on the zooplankton community during mid-spring. Our results show that different taxonomic and functional groups occurred within the mesozooplankton community along an offshore-inshore-oriented transect. Some groups occurred mostly offshore (i.e. euphausiids, fish larvae, stomatopods, amphipods), while others occurred in higher abundance inshore (i.e. medusae, chaetognaths, siphonophores, ostracods). Early life stages of ecologically key species, such as Euphausia vallentini and pelagic stages of Munida gregaria, occurred mostly at the Golfo de Penas. Higher trophic positions estimated from delta 15N occurred in mesozooplankton groups inshore (Baker Channel) and lower at the Golfo de Penas, coinciding with the decrease in C:N ratio in zooplankton and with an increase in chlorophyll-a values in the seawater seawards. The delta 13C distribution in the zooplankton groups along the offshore-inshore transect showed a positive gradient from the inshore most stations towards the Baker Channel mouth, suggesting a negative relationship with freshwater carrying terrestrial organic carbon and a positive relationship with seawater. However, from the channel mouth seawards, a decrease in delta 13C in most zooplankton groups occurred. Within the Baker Channel, low delta 13C values occurred in particulate organic matter (POM) at the surface layer, higher values at intermediate depths, and low values at the deepest zones. This uneven distribution of delta 13C values in POM and zooplankton, along with the presence of different water masses at different depths suggest an along-basin transport of organic carbon of different sources at different layers: of terrestrial origin at surface, marine origin at mid depth, and from degraded organic matter from offshore entering at higher depths. Thus, a complex scenario of lateral transport of water of different characteristics modulates the presence of zooplankton in different locations and their food sources along the area. These findings resemble others observed in further south in the Beagle Channel (57 degrees S) also in spring but the relative contribution of different carbon sources may differ between Patagonian systems.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jmarsys.2023.103892
dc.identifier.eissn1879-1573
dc.identifier.issn0924-7963
dc.identifier.urihttps://doi.org/10.1016/j.jmarsys.2023.103892
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91226
dc.identifier.wosidWOS:000990934100001
dc.language.isoen
dc.revistaJournal of marine systems
dc.rightsacceso restringido
dc.subjectPatagonia
dc.subjectFjords
dc.subjectGolfo de Penas
dc.subjectBaker Channel
dc.subjectBeagle Channel
dc.subjectZooplankton
dc.subjectMunida
dc.subjectStable isotopes
dc.titleVertically distinct sources modulate stable isotope signatures and distribution of Mesozooplankton in central Patagonia: The Golfo de Penas- Baker Channel connection and analogies with the Beagle Channel
dc.typeartículo
dc.volumen241
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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