Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean
Paleoceanographic studies often rely on abundance changes in microfossil species, with little consideration for characteristics such as organism size, which may also be related to environmental changes. Using a tropical Indian Ocean (TIO) core-top data set, we test the Optimum size-hypothesis (OSH),...
Published in: | Geochemistry, Geophysics, Geosystems |
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Language: | English |
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American Geophysical Union (AGU)
2023
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Online Access: | https://archimer.ifremer.fr/doc/00831/94307/101698.pdf https://archimer.ifremer.fr/doc/00831/94307/101699.pdf https://doi.org/10.1029/2022GC010586 https://archimer.ifremer.fr/doc/00831/94307/ |
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ftarchimer:oai:archimer.ifremer.fr:94307 2023-12-24T10:24:17+01:00 Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean Adebayo, Michael B. Bolton, Clara T. Marchant, Ross Bassinot, Franck Conrod, Sandrine De Garidel‐thoron, Thibault 2023-04 application/pdf https://archimer.ifremer.fr/doc/00831/94307/101698.pdf https://archimer.ifremer.fr/doc/00831/94307/101699.pdf https://doi.org/10.1029/2022GC010586 https://archimer.ifremer.fr/doc/00831/94307/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00831/94307/101698.pdf https://archimer.ifremer.fr/doc/00831/94307/101699.pdf doi:10.1029/2022GC010586 https://archimer.ifremer.fr/doc/00831/94307/ info:eu-repo/semantics/openAccess restricted use Geochemistry Geophysics Geosystems (1525-2027) (American Geophysical Union (AGU)), 2023-04 , Vol. 24 , N. 4 , P. e2022GC010586 (28p.) planktonic foraminifera size automated analysis optimum size-hypothesis environmental controls sea surface temperature carbonate ion concentration text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1029/2022GC010586 2023-11-28T23:51:10Z Paleoceanographic studies often rely on abundance changes in microfossil species, with little consideration for characteristics such as organism size, which may also be related to environmental changes. Using a tropical Indian Ocean (TIO) core-top data set, we test the Optimum size-hypothesis (OSH), investigating whether relative abundance or environmental variables are better descriptors of planktonic foraminifera species' optimum conditions. We also investigate the environmental drivers of whole-assemblage planktonic foraminiferal test size variation in the TIO. We use an automated imaging and sorting system (MiSo) to identify planktonic foraminiferal species, analyze their morphology, and quantify fragmentation rate using machine learning techniques. Machine model accuracy is confirmed by comparison with human classifiers (97% accuracy). Data for 33 environmental parameters were extracted from modern databases and, through exploratory factor analysis and regression models, we explore relationships between planktonic foraminiferal size and oceanographic parameters in the TIO. Results show that the size frequency distribution of most planktonic foraminifera species is unimodal, with some larger species showing multimodal distributions. Assemblage size95/5 (95th percentile size) increases with increasing species diversity, and this is attributed to vertical niche separation induced by thermal stratification. Our test for the OSH reveals that relative abundance is not a good predictor of species' optima and within-species size95/5 response to environmental parameters is species-specific, with parameters related to carbonate ion concentration, temperature, and salinity being primary drivers. At the species and assemblage levels, our analyses indicate that carbonate ion concentration and temperature play important roles in determining size trends in TIO planktonic foraminifera. Key Points Optimum size-hypothesis holds true in planktonic foraminifera if one considers the main parameters driving each species' size ... Article in Journal/Newspaper Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Geochemistry, Geophysics, Geosystems 24 4 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
planktonic foraminifera size automated analysis optimum size-hypothesis environmental controls sea surface temperature carbonate ion concentration |
spellingShingle |
planktonic foraminifera size automated analysis optimum size-hypothesis environmental controls sea surface temperature carbonate ion concentration Adebayo, Michael B. Bolton, Clara T. Marchant, Ross Bassinot, Franck Conrod, Sandrine De Garidel‐thoron, Thibault Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
topic_facet |
planktonic foraminifera size automated analysis optimum size-hypothesis environmental controls sea surface temperature carbonate ion concentration |
description |
Paleoceanographic studies often rely on abundance changes in microfossil species, with little consideration for characteristics such as organism size, which may also be related to environmental changes. Using a tropical Indian Ocean (TIO) core-top data set, we test the Optimum size-hypothesis (OSH), investigating whether relative abundance or environmental variables are better descriptors of planktonic foraminifera species' optimum conditions. We also investigate the environmental drivers of whole-assemblage planktonic foraminiferal test size variation in the TIO. We use an automated imaging and sorting system (MiSo) to identify planktonic foraminiferal species, analyze their morphology, and quantify fragmentation rate using machine learning techniques. Machine model accuracy is confirmed by comparison with human classifiers (97% accuracy). Data for 33 environmental parameters were extracted from modern databases and, through exploratory factor analysis and regression models, we explore relationships between planktonic foraminiferal size and oceanographic parameters in the TIO. Results show that the size frequency distribution of most planktonic foraminifera species is unimodal, with some larger species showing multimodal distributions. Assemblage size95/5 (95th percentile size) increases with increasing species diversity, and this is attributed to vertical niche separation induced by thermal stratification. Our test for the OSH reveals that relative abundance is not a good predictor of species' optima and within-species size95/5 response to environmental parameters is species-specific, with parameters related to carbonate ion concentration, temperature, and salinity being primary drivers. At the species and assemblage levels, our analyses indicate that carbonate ion concentration and temperature play important roles in determining size trends in TIO planktonic foraminifera. Key Points Optimum size-hypothesis holds true in planktonic foraminifera if one considers the main parameters driving each species' size ... |
format |
Article in Journal/Newspaper |
author |
Adebayo, Michael B. Bolton, Clara T. Marchant, Ross Bassinot, Franck Conrod, Sandrine De Garidel‐thoron, Thibault |
author_facet |
Adebayo, Michael B. Bolton, Clara T. Marchant, Ross Bassinot, Franck Conrod, Sandrine De Garidel‐thoron, Thibault |
author_sort |
Adebayo, Michael B. |
title |
Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
title_short |
Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
title_full |
Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
title_fullStr |
Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
title_full_unstemmed |
Environmental Controls of Size Distribution of Modern Planktonic Foraminifera in the Tropical Indian Ocean |
title_sort |
environmental controls of size distribution of modern planktonic foraminifera in the tropical indian ocean |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00831/94307/101698.pdf https://archimer.ifremer.fr/doc/00831/94307/101699.pdf https://doi.org/10.1029/2022GC010586 https://archimer.ifremer.fr/doc/00831/94307/ |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Geochemistry Geophysics Geosystems (1525-2027) (American Geophysical Union (AGU)), 2023-04 , Vol. 24 , N. 4 , P. e2022GC010586 (28p.) |
op_relation |
https://archimer.ifremer.fr/doc/00831/94307/101698.pdf https://archimer.ifremer.fr/doc/00831/94307/101699.pdf doi:10.1029/2022GC010586 https://archimer.ifremer.fr/doc/00831/94307/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2022GC010586 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
24 |
container_issue |
4 |
_version_ |
1786198906338541568 |