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 South-Western Atlantic Ocean to assess the hypothesis that the decimation of megafauna lead to changes in the trophic position of mesopredators. Modern and ancient...
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ftzenodo:oai:zenodo.org:6519860 2023-05-15T16:53:41+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, Angélica M. Briz i Godino, Ivan Salemme, Mónica Santiago, Fernando Belardi, Juan Bautista Borella, Florencia Vales, Damián G. Crespo, Enrique A. Cardona, Luis 2022-05-05 https://zenodo.org/record/6519860 https://doi.org/10.5281/zenodo.6519860 unknown doi:10.5061/dryad.dbrv15f3k doi:10.5281/zenodo.6519859 https://zenodo.org/communities/dryad https://zenodo.org/record/6519860 https://doi.org/10.5281/zenodo.6519860 oai:zenodo.org:6519860 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Magellanic penguin Imperial shag marine ecosystem Stable isotopes zooarchaeology info:eu-repo/semantics/other other 2022 ftzenodo https://doi.org/10.5281/zenodo.651986010.5061/dryad.dbrv15f3k10.5281/zenodo.6519859 2023-03-11T00:08:40Z This study compares the δ15N values and the trophic position of two seabird species throughout the Late Holocene in three regions in the South-Western Atlantic Ocean to assess the hypothesis that the decimation of megafauna lead to changes in the trophic position of mesopredators. Modern and ancient mollusc shells were also analysed 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 to 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 18th 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. Funding provided by: Fundació Bosch i GimperaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100008394Award Number: 309765 Other/Unknown Material Imperial Shag Zenodo Argentine Hake ENVELOPE(15.612,15.612,66.797,66.797) Patagonia |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Magellanic penguin Imperial shag marine ecosystem Stable isotopes zooarchaeology |
spellingShingle |
Magellanic penguin Imperial shag marine ecosystem Stable isotopes zooarchaeology Bas, Maria Tivoli, Angélica M. Briz i Godino, Ivan Salemme, Mónica Santiago, Fernando Belardi, Juan Bautista Borella, Florencia Vales, Damián G. Crespo, Enrique A. Cardona, Luis Changing diets over time: knock-on effects of marine megafauna overexploitation on their competitors in the South-Western Atlantic Ocean |
topic_facet |
Magellanic penguin Imperial shag marine ecosystem Stable isotopes zooarchaeology |
description |
This study compares the δ15N values and the trophic position of two seabird species throughout the Late Holocene in three regions in the South-Western Atlantic Ocean to assess the hypothesis that the decimation of megafauna lead to changes in the trophic position of mesopredators. Modern and ancient mollusc shells were also analysed 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 to 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 18th 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. Funding provided by: Fundació Bosch i GimperaCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100008394Award Number: 309765 |
format |
Other/Unknown Material |
author |
Bas, Maria Tivoli, Angélica M. Briz i Godino, Ivan Salemme, Mónica Santiago, Fernando Belardi, Juan Bautista Borella, Florencia Vales, Damián G. Crespo, Enrique A. Cardona, Luis |
author_facet |
Bas, Maria Tivoli, Angélica M. Briz i Godino, Ivan Salemme, Mónica Santiago, Fernando Belardi, Juan Bautista Borella, Florencia Vales, Damián G. Crespo, Enrique A. 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 |
publishDate |
2022 |
url |
https://zenodo.org/record/6519860 https://doi.org/10.5281/zenodo.6519860 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Argentine Hake Patagonia |
geographic_facet |
Argentine Hake Patagonia |
genre |
Imperial Shag |
genre_facet |
Imperial Shag |
op_relation |
doi:10.5061/dryad.dbrv15f3k doi:10.5281/zenodo.6519859 https://zenodo.org/communities/dryad https://zenodo.org/record/6519860 https://doi.org/10.5281/zenodo.6519860 oai:zenodo.org:6519860 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.651986010.5061/dryad.dbrv15f3k10.5281/zenodo.6519859 |
_version_ |
1766044262038765568 |