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dc.contributor.author
Aguirre, Marina Laura
dc.contributor.author
Richiano, Sebastián Miguel
dc.contributor.author
Voelker, Antje
dc.contributor.author
Dettman, David
dc.contributor.author
Schöne, Bernd R.
dc.contributor.author
Panarello, Hector Osvaldo
dc.contributor.author
Donato, Mariano Humberto
dc.contributor.author
Gómez Peral, Lucia
dc.contributor.author
Castro, L. E.
dc.contributor.author
Medina, Rubén
dc.date.available
2021-01-14T11:57:47Z
dc.date.issued
2019-10
dc.identifier.citation
Aguirre, Marina Laura; Richiano, Sebastián Miguel; Voelker, Antje; Dettman, David; Schöne, Bernd R.; et al.; Late Quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes?; Elsevier Science; Global and Planetary Change; 181; 10-2019; 1-60
dc.identifier.issn
0921-8181
dc.identifier.uri
http://hdl.handle.net/11336/122704
dc.description.abstract
Varied approaches (palaeobiodiversity, palaeobiogeography, bioerosion, geochemistry) to unique Patagonian late Quaternary molluscan assemblages in the southwestern Atlantic, with ages especially from interglacial Marine Isotope Stage (MIS) 5e and MIS 1, provide large-scale and long-temporal palaeoenvironmental data for the southern SWA. Together with new patterns of δ18O and δ13C variations in modern, mid-Holocene, and Late to Middle Pleistocene shells of Protothaca antiqua (Bivalvia) and the coeval Pleistocene Tegula atra (Gastropoda), the overall sources of evidence illustrate possible responses to recent palaeoclimate and sea-ice changes around the southernmost SWA-western Antarctica, leading to modern conditions. For the mid-Holocene, the influence of the Hypsithermal is confirmed. In the northern Golfo San Matías, the highest δ18O and δ13C values support higher salinity and sea surface temperatures (SST), and a Golfo San Matías Front stronger than today. Lower δ18O values in the northern Golfo San Jorge (GSJ) compared to the Late to Middle Pleistocene suggest warmer mid-Holocene waters, independently supported by thermally anomalous molluscan taxa, geographical shifts of areas of endemism and absence of T. atra (cold water proxy); overall higher δ13C values compared to present suggest higher productivity. For the Late to Middle Pleistocene (particularly MIS 5e), highest δ13C values (relative to modern and mid-Holocene trends) match with the location of tidal fronts and areas of maximum chlorophyll-a concentrations today. Accordingly, these fronts may have been already active and significantly intensified due to the prevailing climate conditions that included colder waters and stronger upwelling from the southern GSJ southwards. This is independently supported by palaeobiogeographical and bioerosion trends and the dominance of the cold water species T. atra during the Pleistocene, which is dispersed from the SE Pacific into the SWA by rafting on kelps and whose occurrence is controlled by SST, light, winds, and nutrient concentration/productivity. Repeated, abrupt climate oscillations during the last glacial cycle with significant impact on SST, ice melting and surface-ocean stratification in the western Antarctica-Weddell Sea-Antarctic Circumpolar Current realm are so far the only available plausible explanations to account for the different mid-Holocene and modern patterns, and for the regional disappearance of T. atra after MIS 5e. Further palaeoceanographic research in this key area is needed to understand how all these mechanisms operated in the past, potentially influencing the Patagonian shelf waters and coastal fronts.
dc.description.abstract
Varied approaches (palaeobiodiversity, palaeobiogeography, bioerosion, geochemistry) to unique Patagonian late Quaternary molluscan assemblages in the southwestern Atlantic, with ages especially from interglacial Marine Isotope Stage (MIS) 5e and MIS 1, provide large-scale and long-temporal palaeoenvironmental data for the southern SWA. Together with new patterns of δ18O and δ13C variations in modern, mid-Holocene, and Late to Middle Pleistocene shells of Protothaca antiqua (Bivalvia) and the coeval Pleistocene Tegula atra (Gastropoda), the overall sources of evidence illustrate possible responses to recent palaeoclimate and sea-ice changes around the southernmost SWA-western Antarctica, leading to modern conditions. For the mid-Holocene, the influence of the Hypsithermal is confirmed. In the northern Golfo San Matías, the highest δ18O and δ13C values support higher salinity and sea surface temperatures (SST), and a Golfo San Matías Front stronger than today. Lower δ18O values in the northern Golfo San Jorge (GSJ) compared to the Late to Middle Pleistocene suggest warmer mid-Holocene waters, independently supported by thermally anomalous molluscan taxa, geographical shifts of areas of endemism and absence of T. atra (cold water proxy); overall higher δ13C values compared to present suggest higher productivity. For the Late to Middle Pleistocene (particularly MIS 5e), highest δ13C values (relative to modern and mid-Holocene trends) match with the location of tidal fronts and areas of maximum chlorophyll-a concentrations today. Accordingly, these fronts may have been already active and significantly intensified due to the prevailing climate conditions that included colder waters and stronger upwelling from the southern GSJ southwards. This is independently supported by palaeobiogeographical and bioerosion trends and the dominance of the cold water species T. atra during the Pleistocene, which is dispersed from the SE Pacific into the SWA by rafting on kelps and whose occurrence is controlled by SST, light, winds, and nutrient concentration/productivity. Repeated, abrupt climate oscillations during the last glacial cycle with significant impact on SST, ice melting and surface-ocean stratification in the western Antarctica-Weddell Sea-Antarctic Circumpolar Current realm are so far the only available plausible explanations to account for the different midHolocene and modern patterns, and for the regional disappearance of T. atra after MIS 5e. Further palaeoceanographic research in this key area is needed to understand how all these mechanisms operated in the past, potentially influencing the Patagonian shelf waters and coastal fronts.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights
Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5 AR)
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HOLOCENE
dc.subject
MAR ARGENTINO
dc.subject
OCEAN FRONTS
dc.subject
P. ANTIQUA
dc.subject
PALAEOPRODUCTIVITY
dc.subject
PLEISTOCENE
dc.subject
T. ATRA
dc.subject.classification
Geociencias multidisciplinaria
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Late Quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes?
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-06T20:23:07Z
dc.journal.volume
181
dc.journal.pagination
1-60
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Aguirre, Marina Laura. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Richiano, Sebastián Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Voelker, Antje. Instituto Português do Mar e da Atmosfera; Portugal. Universidade do Algarve; Brasil
dc.description.fil
Fil: Dettman, David. University of Arizona; Estados Unidos
dc.description.fil
Fil: Schöne, Bernd R.. Johannes Gutenberg Universitat Mainz; Alemania
dc.description.fil
Fil: Panarello, Hector Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Geología Aplicada; Argentina
dc.description.fil
Fil: Donato, Mariano Humberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina
dc.description.fil
Fil: Gómez Peral, Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Castro, L. E.. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
dc.description.fil
Fil: Medina, Rubén. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina
dc.journal.title
Global and Planetary Change
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S092181811830729X
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.gloplacha.2019.102990
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