Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean
This study compares the δ15N values and the trophic position of two seabird species throughout the late Holocene in three regions in the southwestern Atlantic Ocean to assess the hypothesis that the decimation of megafauna led to changes in the trophic position of mesopredators. Modern and ancient m...
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ftconicet:oai:ri.conicet.gov.ar:11336/194064 2023-10-09T21:52:54+02:00 Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean Bas, Maria Tivoli, Angelica Montserrat Briz Godino, Ivan Salemme, Monica Cira Santiago, Fernando Carlos Belardi, Juan Bautista Borella, Florencia Vales, Damián Gustavo Crespo, Enrique Alberto Cardona, Luis application/pdf http://hdl.handle.net/11336/194064 eng eng Paleontological Society info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/paleobiology/article/changing-diets-over-time-knockon-effects-of-marine-megafauna-overexploitation-on-their-competitors-in-the-southwestern-atlantic-ocean/D32BEF1826029FAD6008853D0E44CB4A info:eu-repo/semantics/altIdentifier/doi/10.1017/pab.2022.19 http://hdl.handle.net/11336/194064 Bas, Maria; Tivoli, Angelica Montserrat; Briz Godino, Ivan; Salemme, Monica Cira; Santiago, Fernando Carlos; et al.; Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean; Paleontological Society; Paleobiology; 49; 1; 6-2022; 176-190 0094-8373 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ IMPERIAL SHAG MAGELLANIC PENGUIN MARINE ECOSYSTEM STABLE ISOTOPES ZOOARCHAEOLOGY https://purl.org/becyt/ford/6.1 https://purl.org/becyt/ford/6 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1017/pab.2022.19 2023-09-24T20:29:46Z This study compares the δ15N values and the trophic position of two seabird species throughout the late Holocene in three regions in the southwestern Atlantic Ocean to assess the hypothesis that the decimation of megafauna led to changes in the trophic position of mesopredators. Modern and ancient mollusk shells were also analyzed to account for changes in the isotopic baseline through time. Results revealed that modern Magellanic penguins have higher δ15N values than their ancient conspecifics in the three regions, after controlling for changes in the isotopic baseline. This was also true for modern Imperial shags compared with ancient unidentified cormorants/shags from the two areas where ancient specimens were recovered (southern Patagonia and the Beagle Channel). Such temporal variability might be caused by three non-mutually exclusive processes: decreased availability of pelagic squat lobster resulting from decreasing primary productivity through the late Holocene, increased availability of small fishes resulting from the sequential depletion of other piscivores (South American fur seal and sea lion and Argentine hake) since the late eighteenth century, and modification of the migratory patterns of Magellanic penguins. Although disentangling the relative contribution of all those processes is impossible at this time, the results reported here demonstrate that the ecology of Magellanic penguins and Imperial shags has undergone major changes since the late Holocene. Fil: Bas, Maria. Universidad de Barcelona; España Fil: Tivoli, Angelica Montserrat. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Briz Godino, Ivan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. University of York; Reino Unido Fil: Salemme, Monica Cira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Santiago, Fernando ... Article in Journal/Newspaper Imperial Shag CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Patagonia Argentina Argentine Hake ENVELOPE(15.612,15.612,66.797,66.797) Paleobiology 49 1 176 190 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
IMPERIAL SHAG MAGELLANIC PENGUIN MARINE ECOSYSTEM STABLE ISOTOPES ZOOARCHAEOLOGY https://purl.org/becyt/ford/6.1 https://purl.org/becyt/ford/6 |
spellingShingle |
IMPERIAL SHAG MAGELLANIC PENGUIN MARINE ECOSYSTEM STABLE ISOTOPES ZOOARCHAEOLOGY https://purl.org/becyt/ford/6.1 https://purl.org/becyt/ford/6 Bas, Maria Tivoli, Angelica Montserrat Briz Godino, Ivan Salemme, Monica Cira Santiago, Fernando Carlos Belardi, Juan Bautista Borella, Florencia Vales, Damián Gustavo Crespo, Enrique Alberto Cardona, Luis Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
topic_facet |
IMPERIAL SHAG MAGELLANIC PENGUIN MARINE ECOSYSTEM STABLE ISOTOPES ZOOARCHAEOLOGY https://purl.org/becyt/ford/6.1 https://purl.org/becyt/ford/6 |
description |
This study compares the δ15N values and the trophic position of two seabird species throughout the late Holocene in three regions in the southwestern Atlantic Ocean to assess the hypothesis that the decimation of megafauna led to changes in the trophic position of mesopredators. Modern and ancient mollusk shells were also analyzed to account for changes in the isotopic baseline through time. Results revealed that modern Magellanic penguins have higher δ15N values than their ancient conspecifics in the three regions, after controlling for changes in the isotopic baseline. This was also true for modern Imperial shags compared with ancient unidentified cormorants/shags from the two areas where ancient specimens were recovered (southern Patagonia and the Beagle Channel). Such temporal variability might be caused by three non-mutually exclusive processes: decreased availability of pelagic squat lobster resulting from decreasing primary productivity through the late Holocene, increased availability of small fishes resulting from the sequential depletion of other piscivores (South American fur seal and sea lion and Argentine hake) since the late eighteenth century, and modification of the migratory patterns of Magellanic penguins. Although disentangling the relative contribution of all those processes is impossible at this time, the results reported here demonstrate that the ecology of Magellanic penguins and Imperial shags has undergone major changes since the late Holocene. Fil: Bas, Maria. Universidad de Barcelona; España Fil: Tivoli, Angelica Montserrat. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Briz Godino, Ivan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. University of York; Reino Unido Fil: Salemme, Monica Cira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Santiago, Fernando ... |
format |
Article in Journal/Newspaper |
author |
Bas, Maria Tivoli, Angelica Montserrat Briz Godino, Ivan Salemme, Monica Cira Santiago, Fernando Carlos Belardi, Juan Bautista Borella, Florencia Vales, Damián Gustavo Crespo, Enrique Alberto Cardona, Luis |
author_facet |
Bas, Maria Tivoli, Angelica Montserrat Briz Godino, Ivan Salemme, Monica Cira Santiago, Fernando Carlos Belardi, Juan Bautista Borella, Florencia Vales, Damián Gustavo Crespo, Enrique Alberto Cardona, Luis |
author_sort |
Bas, Maria |
title |
Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
title_short |
Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
title_full |
Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
title_fullStr |
Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
title_full_unstemmed |
Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
title_sort |
changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the south-western atlantic ocean |
publisher |
Paleontological Society |
url |
http://hdl.handle.net/11336/194064 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Austral Patagonia Argentina Argentine Hake |
geographic_facet |
Austral Patagonia Argentina Argentine Hake |
genre |
Imperial Shag |
genre_facet |
Imperial Shag |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/paleobiology/article/changing-diets-over-time-knockon-effects-of-marine-megafauna-overexploitation-on-their-competitors-in-the-southwestern-atlantic-ocean/D32BEF1826029FAD6008853D0E44CB4A info:eu-repo/semantics/altIdentifier/doi/10.1017/pab.2022.19 http://hdl.handle.net/11336/194064 Bas, Maria; Tivoli, Angelica Montserrat; Briz Godino, Ivan; Salemme, Monica Cira; Santiago, Fernando Carlos; et al.; Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean; Paleontological Society; Paleobiology; 49; 1; 6-2022; 176-190 0094-8373 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1017/pab.2022.19 |
container_title |
Paleobiology |
container_volume |
49 |
container_issue |
1 |
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176 |
op_container_end_page |
190 |
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1779316104678604800 |