Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ...
The first size reduction (FSR) in the Reticulofenestra-Gephyrocapsa-Emiliania (RGE) lineage (Order Isochrysidales) which occurred in the early Oligocene (~ 32 Ma), is of great significance for understanding the lilliput effect that has affected the coccolithophore communities from late Eocene to thi...
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ftdatacite:10.5061/dryad.cjsxksnbm 2024-02-04T10:04:32+01:00 Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... Ma, Ruigang Aubry, Marie-Pierre Bord, David Jin, Xiaobo Liu, Chuanlian 2023 https://dx.doi.org/10.5061/dryad.cjsxksnbm https://datadryad.org/stash/dataset/doi:10.5061/dryad.cjsxksnbm en eng Dryad https://dx.doi.org/10.1017/pab.2023.20 https://dx.doi.org/10.5281/zenodo.7988282 Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 FOS Earth and related environmental sciences Coccolith Isochrysidales Adaptive morphology Eocene-Oligocene mixotrophy Paleontology General Agricultural and Biological Sciences Ecology FOS Biological sciences Ecology, Evolution, Behavior and Systematics Dataset dataset 2023 ftdatacite https://doi.org/10.5061/dryad.cjsxksnbm10.1017/pab.2023.2010.5281/zenodo.7988282 2024-01-05T04:39:59Z The first size reduction (FSR) in the Reticulofenestra-Gephyrocapsa-Emiliania (RGE) lineage (Order Isochrysidales) which occurred in the early Oligocene (~ 32 Ma), is of great significance for understanding the lilliput effect that has affected the coccolithophore communities from late Eocene to this day. We conducted a morphologic analysis on the coccoliths of Reticulofenestra species that lived during the late middle Eocene to early Oligocene (~40-31 Ma), using marine sediments from the South Atlantic Ocean. Our data show increasing size and decreasing abundance of the large species during the late Eocene, leading to their disappearance at the FSR, and a concurrent decrease in the size variability of the small-medium-sized coccoliths whose diameter of the central opening had become very reduced. Although the cosmopolitan late Paleogene through Neogene size decrease in coccolithophores has been linked to the concomitant long-term decline in global pCO2, we suggest here that the FSR was the result of ... : Morphometric measurements were performed by randomly taking photographs in bright field of 10 to 15 fields of view per smear slide at 1000x magnification. A field of view typically contained 5 to 10 Reticulofenestra placoliths. For each sample, one hundred (100) specimens were measured. To avoid distortion caused by different orientations of the coccoliths as seen in light microscopy, only specimens horizontally oriented with the microscope stage were measured.Measurements were conducted manually using the biometric analysis software Fiji version 1.52 P by dragging ellipses over the contours of each placolith in order to measure its length and width. The long and short diameters of the central opening were likewise measured. Our procedure has resulted in a database of 6400 measurements for the whole study.We undertook a morphometric analysis with the double objective of quantifying the morphological features of the placoliths at any stratigraphic level and analyzing their change through time. Three ... Dataset South Atlantic Ocean DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
FOS Earth and related environmental sciences Coccolith Isochrysidales Adaptive morphology Eocene-Oligocene mixotrophy Paleontology General Agricultural and Biological Sciences Ecology FOS Biological sciences Ecology, Evolution, Behavior and Systematics |
spellingShingle |
FOS Earth and related environmental sciences Coccolith Isochrysidales Adaptive morphology Eocene-Oligocene mixotrophy Paleontology General Agricultural and Biological Sciences Ecology FOS Biological sciences Ecology, Evolution, Behavior and Systematics Ma, Ruigang Aubry, Marie-Pierre Bord, David Jin, Xiaobo Liu, Chuanlian Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
topic_facet |
FOS Earth and related environmental sciences Coccolith Isochrysidales Adaptive morphology Eocene-Oligocene mixotrophy Paleontology General Agricultural and Biological Sciences Ecology FOS Biological sciences Ecology, Evolution, Behavior and Systematics |
description |
The first size reduction (FSR) in the Reticulofenestra-Gephyrocapsa-Emiliania (RGE) lineage (Order Isochrysidales) which occurred in the early Oligocene (~ 32 Ma), is of great significance for understanding the lilliput effect that has affected the coccolithophore communities from late Eocene to this day. We conducted a morphologic analysis on the coccoliths of Reticulofenestra species that lived during the late middle Eocene to early Oligocene (~40-31 Ma), using marine sediments from the South Atlantic Ocean. Our data show increasing size and decreasing abundance of the large species during the late Eocene, leading to their disappearance at the FSR, and a concurrent decrease in the size variability of the small-medium-sized coccoliths whose diameter of the central opening had become very reduced. Although the cosmopolitan late Paleogene through Neogene size decrease in coccolithophores has been linked to the concomitant long-term decline in global pCO2, we suggest here that the FSR was the result of ... : Morphometric measurements were performed by randomly taking photographs in bright field of 10 to 15 fields of view per smear slide at 1000x magnification. A field of view typically contained 5 to 10 Reticulofenestra placoliths. For each sample, one hundred (100) specimens were measured. To avoid distortion caused by different orientations of the coccoliths as seen in light microscopy, only specimens horizontally oriented with the microscope stage were measured.Measurements were conducted manually using the biometric analysis software Fiji version 1.52 P by dragging ellipses over the contours of each placolith in order to measure its length and width. The long and short diameters of the central opening were likewise measured. Our procedure has resulted in a database of 6400 measurements for the whole study.We undertook a morphometric analysis with the double objective of quantifying the morphological features of the placoliths at any stratigraphic level and analyzing their change through time. Three ... |
format |
Dataset |
author |
Ma, Ruigang Aubry, Marie-Pierre Bord, David Jin, Xiaobo Liu, Chuanlian |
author_facet |
Ma, Ruigang Aubry, Marie-Pierre Bord, David Jin, Xiaobo Liu, Chuanlian |
author_sort |
Ma, Ruigang |
title |
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
title_short |
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
title_full |
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
title_fullStr |
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
title_full_unstemmed |
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales) ... |
title_sort |
morphometric data of the late middle eocene to early oligocene (~40 - 31 ma) coccolithophore reticulofenestra (order isochrysidales) ... |
publisher |
Dryad |
publishDate |
2023 |
url |
https://dx.doi.org/10.5061/dryad.cjsxksnbm https://datadryad.org/stash/dataset/doi:10.5061/dryad.cjsxksnbm |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://dx.doi.org/10.1017/pab.2023.20 https://dx.doi.org/10.5281/zenodo.7988282 |
op_rights |
Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 |
op_doi |
https://doi.org/10.5061/dryad.cjsxksnbm10.1017/pab.2023.2010.5281/zenodo.7988282 |
_version_ |
1789973089850753024 |