Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes?
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 palaeoen...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/10400.1/14516 https://doi.org/10.1016/j.gloplacha.2019.102990 |
id |
ftunivalgarve:oai:sapientia.ualg.pt:10400.1/14516 |
---|---|
record_format |
openpolar |
spelling |
ftunivalgarve:oai:sapientia.ualg.pt:10400.1/14516 2023-05-15T14:03:09+02:00 Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? Aguirre, M. L. Richiano, S. Voelker, A Dettman, D. L. Schöne, B. R. Panarello, H. O. Donato, M. Peral, L. Gómez Castro, L. E. Medina, R. 2020-07-23T21:23:33Z http://hdl.handle.net/10400.1/14516 https://doi.org/10.1016/j.gloplacha.2019.102990 eng eng Elsevier info:eu-repo/grantAgreement/FCT/5876/147257/PT 0921-8181 http://hdl.handle.net/10400.1/14516 cv-prod-674491 doi:10.1016/j.gloplacha.2019.102990 openAccess South America Molluscs Stable isotopes Interglacial article 2020 ftunivalgarve https://doi.org/10.1016/j.gloplacha.2019.102990 2022-05-30T08:49:10Z 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, ... Article in Journal/Newspaper Antarc* Antarctica Sea ice Southern Ocean Universidade do Algarve: Sapienta Pacific Patagonia Southern Ocean Global and Planetary Change 181 102990 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
South America Molluscs Stable isotopes Interglacial |
spellingShingle |
South America Molluscs Stable isotopes Interglacial Aguirre, M. L. Richiano, S. Voelker, A Dettman, D. L. Schöne, B. R. Panarello, H. O. Donato, M. Peral, L. Gómez Castro, L. E. Medina, R. Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
topic_facet |
South America Molluscs Stable isotopes Interglacial |
description |
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, ... |
format |
Article in Journal/Newspaper |
author |
Aguirre, M. L. Richiano, S. Voelker, A Dettman, D. L. Schöne, B. R. Panarello, H. O. Donato, M. Peral, L. Gómez Castro, L. E. Medina, R. |
author_facet |
Aguirre, M. L. Richiano, S. Voelker, A Dettman, D. L. Schöne, B. R. Panarello, H. O. Donato, M. Peral, L. Gómez Castro, L. E. Medina, R. |
author_sort |
Aguirre, M. L. |
title |
Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
title_short |
Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
title_full |
Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
title_fullStr |
Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
title_full_unstemmed |
Late quaternary nearshore molluscan patterns from Patagonia: Windows to southern southwestern Atlantic-Southern Ocean palaeoclimate and biodiversity changes? |
title_sort |
late quaternary nearshore molluscan patterns from patagonia: windows to southern southwestern atlantic-southern ocean palaeoclimate and biodiversity changes? |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10400.1/14516 https://doi.org/10.1016/j.gloplacha.2019.102990 |
geographic |
Pacific Patagonia Southern Ocean |
geographic_facet |
Pacific Patagonia Southern Ocean |
genre |
Antarc* Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica Sea ice Southern Ocean |
op_relation |
info:eu-repo/grantAgreement/FCT/5876/147257/PT 0921-8181 http://hdl.handle.net/10400.1/14516 cv-prod-674491 doi:10.1016/j.gloplacha.2019.102990 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2019.102990 |
container_title |
Global and Planetary Change |
container_volume |
181 |
container_start_page |
102990 |
_version_ |
1766273691903066112 |