Planktonic foraminifera morphometric data from expedition SAS, Arctic Ocean, 2021

Tirza M. Weitkamp, Allison Y. Hsiang

This dataset includes morphometric measurements of the planktonic foraminifera Neogloboquadrina pachyderma, covering six morphotypes. The data were generated using AutoMorph image analysis software and consist of numerical and categorical outputs describing shape and size features.

The dataset was collected to investigate morphological variation in N. pachyderma populations, which may reflect environmental conditions and reproductive strategies. It can be used to support studies on N. pachyderma taxonomy.

Samples were collected from 8 plankton tow and 4 box core stations across the Central Arctic Ocean, during the summer of 2021 as part of the Synoptic Arctic Survey (SAS) expedition to the central Arctic Ocean with the Swedish icebreaker Oden. The dataset represents spatially scattered stations and includes specimens collected using standardised marine sampling methods.

MarineMicrofossilMorphometric dataPlanktonic foraminiferaCentral Arctic OceanSAS 2021 expeditionIcebreaker Oden

Name

Version

Citation

References

Weitkamp TM, Bird C, Darling KF, Hsiang AY, Ramsay J, Vermassen F, Coxall HK (2025) Aberrant coiling signatures reveal the specialised reproductive strategy of the planktonic foraminifera Neogloboquadrina pachyderma under Central Arctic perennial sea ice. Marine Micropaleontology 201:102503. https://doi.org/10.1016/j.marmicro.2025.102503

Data description

The dataset focuses on the six Neogloboquadrina pachyderma morphotypes (Nps-1 through Nps-5 and Npd). Here, Nps refers to N. pachyderma sinistral (left coiling) morphotypes 1 through 5, and Npd refers to the dextral (right coiling) morphotype.

The dataset includes two xlsx spreadsheet files

• morphotype-count-data-SASODEN2021.xlsx containing the counts of N. pachyderma morphotypes in the water column and sediment
• foraminifera-morphometric-data-SASODEN2021.xlsx containing the 2D morphometric output of the N. pachyderma morphotypes

File content

• morphotype-count-data-SASODEN2021.xlsx contains one tab with the following columns

  • Station Station from which the measurements were taken
  • latitude Latitude of the sampling station (decimal degrees)
  • longitude Longitude of the sampling station (decimal degrees)
  • Depth interval Depth in meters of sampled water, given as an interval (e.g. 100-50 m), or depth in centimeters of sediment (0-1 cm)
  • Nps-1 Counts of sinistral N. pachyderma morphotype Nps-1 in the water column and sediment
  • Nps-2 Counts of sinistral N. pachyderma morphotype Nps- 2in the water column and sediment
  • Nps-3 Counts of sinistral N. pachyderma morphotype Nps-3 in the water column and sediment
  • Nps-4 Counts of sinistral N. pachyderma morphotype Nps-4 in the water column and sediment
  • Nps-5 Counts of sinistral N. pachyderma morphotype Nps-5 in the water column and sediment
  • Npd Counts of dextral N. pachyderma morphotype Npd in the water column and sediment
  • Total counts Total counts of Neogloboquadrina pachyderma morphotypes per sampled depth interval

• foraminifera-morphometric-data-SASODEN2021.xlsx contains one READ_ME and 12 data tabs (8 plankton tow and 4 box core stations). The data tabs are

  • SO21-26-10 Plankton net station
  • SO21-33-6 Plankton net station
  • SO21-38-11 Plankton net station
  • SO21-42-5 Plankton net station
  • SO21-48-5 Plankton net station
  • SO21-50-12 Plankton net station
  • SO21-53-4 Plankton net station
  • SO21-58-16 Plankton net station
  • SO21-26-Bx-6 Box core station counterpart of plankton net station SO21-26-10
  • SO21-38-Bx-12 Box core station counterpart of plankton net station SO21-38-11
  • SO21-42-Bx-6 Box core station counterpart of plankton net station SO21-42-5
  • SO21-50-Bx-15 Box core station counterpart of plankton net station SO21-50-12

• Each data tab has the following columns

  • Station Station ID number
  • Depth interval Depth range of sampled water, given as an interval (e.g. 100-50 m)
  • Morphotype Assigned morphotype of N. pachyderma; includes five sinistral morphotypes (Nps-1 through Nps-5) and one dextral morphotype (Npd)
  • Area Surface area of the segmented object, measured in in μm²
  • Eccentricity A measure of how elongated or non-circular the segmented object is; higher values indicate greater elongation.
  • Perimeter Length of the segmented object's outline, measured in μm
  • MajorAxisLength Length of the longest axis of the segmented object, measured in μm
  • MinorAxisLength Length of the shortest axis of the segmented object, measured in μm
  • Rugosity A measure of the segmented object's surface irregularity; higher values indicate greater roughness or rugosity
  • Height Vertical extent of the segmented object, measured in μm
  • Width Horizontal extent of the segmented object, measured in μm
  • AspectRatio Ratio of height to width; describes the segmented object's overall shape

Comments

The data were acquired in the summer of 2021 from Swedish icebreaker Oden during the Synoptic Arctic Survey (SAS) 2021 expedition organised by the Swedish Polar Research Secretariat.

Project

Synoptic Arctic Survey (SAS) 2021 expedition. Subpolar plankton invasions in the Arctic Ocean during past interglacials. The project was funded by the Swedish Research Council (Vetenskaprådet), grant numbers DNR 2019-03757 and DNR 2023-03792.

Publisher

Bolin Centre Database

License

First name

Tirza

Last name or organisation

Weitkamp

Email address

tirza.weitkamp@geo.su.se

Address

Department of Geological Sciences; Stockholm University

Postal code

SE-106 91

City

Stockholm

Country

Sweden

GCMD science keyword

Earth science > Biological classification > Protists > Amoeboids > Foraminifers

GCMD location

Geographic Region > Arctic

Dataset language

English

Begin date

2021-07-26

End date

2021-09-20

DOI

Time

Versions

• 1 2025-09-10T08:32:28.761+00:00
• 1 2025-05-21T08:06:42.400371+00:00