Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient
Here we report high-latitude stable isotope compositions of Maastrichtian fossil fish and marine reptiles (mainly mosasaurs) from Antarctica (64°S paleolatitude) and compare them with mid-paleolatitude samples from Argentine Patagonia (45°S). Disparities between the δ13C values of bony fish and mari...
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The Paleontological Society
2023
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Online Access: | https://doi.org/10.1017/pab.2022.38 |
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ftbioone:10.1017/pab.2022.38 2024-06-02T07:58:31+00:00 Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández world 2023-05-22 text/HTML https://doi.org/10.1017/pab.2022.38 en eng The Paleontological Society doi:10.1017/pab.2022.38 All rights reserved. https://doi.org/10.1017/pab.2022.38 Text 2023 ftbioone https://doi.org/10.1017/pab.2022.38 2024-05-07T00:48:07Z Here we report high-latitude stable isotope compositions of Maastrichtian fossil fish and marine reptiles (mainly mosasaurs) from Antarctica (64°S paleolatitude) and compare them with mid-paleolatitude samples from Argentine Patagonia (45°S). Disparities between the δ13C values of bony fish and marine reptiles correspond to differences in the foraging ground (distance from the shore and depth), while dramatically higher δ13C values (by 18‰) in shark enameloid cannot be explained through ecology and are here imputed to biomineralization. Comparison with extant vertebrates suggests that the diet alone can explain the offset observed between bony fish and mosasaurs; however, breath holding due to a diving behavior in mosasaurs may have had some impact on their δ13C values, as previously suggested. The δ18OPO4 values of the remains confirm a relatively stable, elevated body temperature for marine reptiles, meaning that they were thermoregulators. We calculated a water temperature of ∼8°C for Antarctica from the fish δ18OPO4 values, warmer than present-day temperatures and consistent with the absence of polar ice sheets during the latest Maastrichtian. Our fish data greatly extend the latitudinal range of Late Cretaceous fish δ18OPO4 values and result in a thermal gradient of 0.4°C/1° of latitude when combined with literature data. Text Antarc* Antarctica BioOne Online Journals Argentine Patagonia Paleobiology 49 2 353 373 |
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BioOne Online Journals |
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ftbioone |
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English |
description |
Here we report high-latitude stable isotope compositions of Maastrichtian fossil fish and marine reptiles (mainly mosasaurs) from Antarctica (64°S paleolatitude) and compare them with mid-paleolatitude samples from Argentine Patagonia (45°S). Disparities between the δ13C values of bony fish and marine reptiles correspond to differences in the foraging ground (distance from the shore and depth), while dramatically higher δ13C values (by 18‰) in shark enameloid cannot be explained through ecology and are here imputed to biomineralization. Comparison with extant vertebrates suggests that the diet alone can explain the offset observed between bony fish and mosasaurs; however, breath holding due to a diving behavior in mosasaurs may have had some impact on their δ13C values, as previously suggested. The δ18OPO4 values of the remains confirm a relatively stable, elevated body temperature for marine reptiles, meaning that they were thermoregulators. We calculated a water temperature of ∼8°C for Antarctica from the fish δ18OPO4 values, warmer than present-day temperatures and consistent with the absence of polar ice sheets during the latest Maastrichtian. Our fish data greatly extend the latitudinal range of Late Cretaceous fish δ18OPO4 values and result in a thermal gradient of 0.4°C/1° of latitude when combined with literature data. |
author2 |
Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández |
format |
Text |
author |
Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández |
spellingShingle |
Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
author_facet |
Léa Leuzinger László Kocsis Zoneibe Luz Torsten Vennemann Alexey Ulyanov Marta Fernández |
author_sort |
Léa Leuzinger |
title |
Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
title_short |
Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
title_full |
Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
title_fullStr |
Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
title_full_unstemmed |
Latest Maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
title_sort |
latest maastrichtian middle- and high-latitude mosasaurs and fish isotopic composition: carbon source, thermoregulation strategy, and thermal latitudinal gradient |
publisher |
The Paleontological Society |
publishDate |
2023 |
url |
https://doi.org/10.1017/pab.2022.38 |
op_coverage |
world |
geographic |
Argentine Patagonia |
geographic_facet |
Argentine Patagonia |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
https://doi.org/10.1017/pab.2022.38 |
op_relation |
doi:10.1017/pab.2022.38 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1017/pab.2022.38 |
container_title |
Paleobiology |
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49 |
container_issue |
2 |
container_start_page |
353 |
op_container_end_page |
373 |
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1800741885800611840 |