Sampling was conducted during the Polar Night cruise 2017 (PNC17), 6th to 17th January 2017 in the waters of the western Barents Sea and Svalbard archipelago. Zooplankton was collected using a Multinet (64um-mesh) This dataset issued in the publication of Barth-Jensen et al. 2022
The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 60 records.
1 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.
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How to cite
Researchers should cite this work as follows:
Barth-Jensen C, Daase M, Ormańczyk M, Kwaśniewski S, Varpe Ø, Svensen C (2022): Abundance of zooplankton during the polar night (cruise in January 2017) at 13 stations using a 64um-mesh Multinet. v1.2. UiT The Arctic University of Norway. Dataset/Samplingevent. https://ipt.gbif.no/resource?r=uit-2017-cruise-zooplankton-abundance&v=1.2
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The publisher and rights holder of this work is UiT The Arctic University of Norway. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 76ef1883-c32a-49bb-a36c-2752af1b4e95. UiT The Arctic University of Norway publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Norway.
Samplingevent; zooplankton meroplankton Svalbard fjord polar night abundances
13 stations were sampled: Six oceanic stations: TB1 and TB2 (located in the western Barents Sea), NS1, NS4 and NS10 (located on the shelf north of Svalbard) and NS6 (located off the shelf north of Svalbard). Seven fjord stations: VMF9 (located near Bellsund, at the opening of Van Mijenfjorden), KF1, KF2 and KF3 (located in Krossfjorden on the west coast of Svalbard), and R3, R3b and R4 (located in Rijpfjorden on the northern coast of Nordaustlandet).
|South West [70.507, 11.596], North East [81.356, 22.256]
No Description available
|Paraeuchaeta, Pseudocalanus, Spinocalanus
|Metridia lucens, Pleuromamma robusta, Scolecithricella minor
|Start Date / End Date
|2017-01-06 / 2017-01-17
No Description available
|PNC17_Polar night cruise January 2017_Zooplankton abundances
|UiT funded the PhD grant of CBJ, and the ARCTOS network funded parts of the cruise. The fieldwork was funded by the Norwegian Research Council (Arctic ABC ). MD received additional funding through NRC project Deep Impact  and was supported by Tromsø Forskningsstiftelse (project Arctic ABC-East).
The personnel involved in the project:
Zooplankton was sampled using vertically stratified net hauls with a multiple opening/closing net (MultiNet type Midi, Hydro-Bios, Germany, mouth opening 0.25 m2, 64-µm mesh, towing speed 0.4 m s-1). The four depth strata sampled were 3-50 m, 50-100 m, 100-200 m and 200-400 m, or to 10 m above the bottom at stations shallower than 400 m. A 64-µm mesh WP-2 net (Hydro-Bios, Germany, opening 0.25 m2) was used for the 0-50 m sampling at station TB2 due to a tear in the MultiNet net bag. A technical error resulted in only the upper 100 m being sampled at station KF1.
|13 stations were sampled between 2017-01-06 and 2017-01-17: Six oceanic stations: TB1 and TB2 (located in the western Barents Sea), NS1, NS4 and NS10 (located on the shelf north of Svalbard) and NS6 (located off the shelf north of Svalbard). Seven fjord stations: VMF9 (located near Bellsund, at the opening of Van Mijenfjorden), KF1, KF2 and KF3 (located in Krossfjorden on the west coast of Svalbard), and R3, R3b and R4 (located in Rijpfjorden on the northern coast of Nordaustlandet).
Method step description:
- Immediately after collection the samples were fixed in hexamethylenetetramine-buffered formaldehyde in seawater solution at 4% final concentration. The samples were later analyzed under a stereomicroscope (Olympus SZX7). Organisms with total length > 5 mm were sorted from the sample, identified and counted. Then aliquots were taken with a 2-mL pipette with the tip cut at 5-mm diameter to allow collection of mesozooplankton. The number of aliquots and subsamples analyzed was chosen so that at least 300 individuals were counted in each sample. The remainder of the sample was screened for rare species. Species were identified to the lowest taxonomic level and classified as holoplankton or meroplankton. For copepods, a detailed analysis of copepodid stage composition was performed for Calanus spp., O. similis, M. norvegica, Pseudocalanus spp., M. longa and Microcalanus spp. The CI to CIII stages were not differentiated for Microcalanus spp. at station TB1, and for O. similis and M. norvegica at all stations. Early stages (CI to CIII) classified as Microcalanus spp. probably included young copepodids of Paracalanus spp., Clausocalanus spp. and Ctenocalanus spp., because it is difficult to distinguish these species via visual identification. The CI to CIII stages of M. longa and M. lucens were not differentiated, and were designated M. longa. The three Calanus species were differentiated on the basis of size (Kwasniewski et al. 2003); this involves some uncertainty because prosome lengths of species of the genus can overlap (Gabrielsen et al. 2012; Choquet et al. 2018). Copepod nauplii were determined to order (Calanoida, Cyclopoida and Harpacticoida).