Tomographic data of Trilobatus trilobus shells from central Atlantic core-top sediment samples
Data files
Nov 01, 2024 version files 31.80 GB
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1.VM27-261_Trilobatus-_trilobus_15shells_300-355μm_783files.rar
1.09 GB
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10.RC24-16_Trilobatus-trilobus_15shells_300-355μm_888files.rar.rar
1.30 GB
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11.RC24-17_Trilobatus-trilobus_15shells_300-355μm_876files.rar.rar
1.19 GB
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12.VM22-175_Trilobatus-trilobus_15shells_300-355μm_855files.rar.rar
1.23 GB
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13.RC16-77_Trilobatus-trilobus_15shells_300-355μm_913files.rar.rar
1.43 GB
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14.VM16-36_Trilobatus-trilobus_15shells_300-355μm_877files.rar.rar
1.25 GB
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15.RC08-19_Trilobatus-trilobus_15shells_300-355μm_704files.rar.rar
981.76 MB
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16.RC08-23_Trilobatus-trilobus_15shells_300-355μm_1000files.rar.rar
1.33 GB
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2.VM19-308_Trilobatus-trilobus_15shells_300-355μm_883files.rar
960.02 MB
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3.VM16-206_Trilobatus-trilobus_15shells_300-355μm_886files.rar
1.21 GB
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4.VM23-112_Trilobatus-trilobus_15shells_300-355μm_969files.rar.rar
1.27 GB
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5.VM22-26_Trilobatus-trilobus_15shells_300-355μm_939files.rar.rar
1.34 GB
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6.RC13-189_Trilobatus-trilobus_15shells_300-355μm_889files.rar.rar
1.19 GB
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7.RC13-188_Trilobatus-trilobus_15shells_300-355μm_899files.rar.rar
1.34 GB
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8.RC24-11_Trilobatus-trilobus_15shells_300-355μm_852files.rar.rar
1.17 GB
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9.RC24-10_Trilobatus-trilobus_15shells_300-355μm_887files.rar.rar
1.27 GB
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README.md
1.82 KB
Abstract
Understanding the controls behind the calcification and distribution of planktonic foraminifera in the modern ocean is important when using these organisms for paleoceanographic reconstructions. This study combines shell geochemistry, light microscopy, and X-ray micro-computed tomography to dissect various parameters of Trilobatus trilobus shells from surface sediments and explore the factors influencing their biometry. The goal is to understand which aspects of the marine environment are critical for the calcification and vertical distribution of this species. T. trilobus is found to produce larger, thinner and overall lighter shells in the equatorial regions compared to the subtropical gyre regions where the shells were up to 4% smaller, more than 60% thicker and approximately 45% heavier. The skeletal mass percentage together with other calcification metrics (shell weight, thickness) are found to depend primarily on ambient seawater salinity rather than carbonate chemistry. In line with their degree of calcification, based on geochemically reconstructed apparent calcification depths, this group of organisms is found shallower into the water column at the equator and the subtropical gyres, while its habitat deepens in between these regions at the extra-equatorial sites. Furthermore, it is demonstrated that T. trilobus, in the (central) Atlantic, occupies a density layer slightly below the salinity maximum isopycnal at various depths, presumably by adjusting its shell properties.
https://doi.org/10.5061/dryad.6t1g1jx6q
High-resolution X-ray tomographic data of Trilobatus trilobus planktonic foraminifera shells collected from the Lamont-Doherty Core Repository. Samples were sourced from cores VM27-261, VM19-308, VM16-206, VM23-112, VM22-26, RC13-189, RC13-188, RC24-10, RC24-11, RC24-16, RC24-17, VM22-175, RC16-77, RC16-36, RC08-19, RC08-23 from the central Atlantic Ocean. The specimens are from the 300-355 μm sieve fraction and the average scanning resolution is ~1.2 μm. The exact voxel size and other scan info are included in each zip file. The analyses were performed using a GE/Phoenix v | tome | x s 240 CT scanner at the Geozentrum Nordbayern. The planktonic tests were fixed in a customized cylindrical container with a calcite microcrystal that can be used to standardize the scanned specimens’ CT number (grey levels). A high-resolution setting (voltage of 80 kV, current 80 μA, detector array size of 1024×1024, 1501 projections/360°, 2.5 s/projection) enabled the acquisition of 3D images with an isotropic pixel size. Phoenix datos | x 2.0 software was used to correct and reconstruct tomographic data using the Feldkamp cone-beam algorithm’s general principle to reconstruct image cross-sections from the filtered back projections. |
Description of the data and file structure
The compressed (*.rar) files contain the Feldkamp cone-beam reconstructed TIFF stacks and an associated *.pca file, which includes acquisition details and can be opened with any text editor. The naming convention for the main folders are: Sample (VM27-261, VM19-308, VM16-206, etc.,)-shell thickness and the number of files included in each folder.
High-resolution X-ray tomographic data of shells of planktonic foraminifera species Trilobatus trilobus from samples VM27-261, VM19-308, VM16-206, VM23-112, VM22-26, RC13-189, RC13-188, RC24-10, RC24-11, RC24-16, RC24-17, VM22-175, RC16-77, RC16-36, RC08-19, RC08-23 from the central Atlantic Ocean. The specimens are from the 300-355 μm sieve fraction and the average scanning resolution is ~1.2 μm. The exact voxel size and other scan info are included in each zip file. The analyses were performed using a GE/Phoenix v|tome|x s 240 CT scanner at the Geozentrum Nordbayern. The planktonic tests were fixed in a customized cylindrical container together with a calcite microcrystal that can be used to standardize the CT number (grey levels) of the scanned specimens. A high-resolution setting (voltage of 80 kV, current 80 μA, detector array size of 1024×1024, 1501 projections/360°, 2.5 s/projection) enabled the acquisition of 3D images with an isotropic pixel size. Phoenix datos|x 2.0 software was used to correct and reconstruct tomographic data that uses the general principle of Feldkamp cone beam algorithm to reconstruct image cross sections from the filtered back projections.