Abundance of zooplankton during the polar night (cruise in January 2017) at 13 stations using a 64um-mesh Multinet

76ef1883-c32a-49bb-a36c-2752af1b4e95 https://ipt.gbif.no/resource?r=uit-2017-cruise-zooplankton-abundance Abundance of zooplankton during the polar night (cruise in January 2017) at 13 stations using a 64um-mesh Multinet Coralie Barth-Jensen University in Tromsø PhD student

Postboks 6050 Langnes Tromsø 9037 NO

coralie.barth-jensen@uit.no 0000-0001-9318-2605 Malin Daase University in Tromsø Researcher

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malin.daase@uit.no 0000-0001-8413-3924 Mateusz Ormańczyk IOPAN Researcher

ormanczyk@iopan.pl 0000-0003-2343-6694 Sławomir Kwaśniewski IOPAN Professor

kwas@iopan.pl 0000-0003-3104-0761 Øystein Varpe University in Bergen Professor

Bergen NO

oystein.varpe@uib.no 0000-0002-5895-6983 Camilla Svensen University in Tromsø Professor

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camilla.svensen@uit.no 0000-0001-9577-3935 Coralie Barth-Jensen University in Tromsø PhD student

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coralie.barth-jensen@uit.no 0000-0001-9318-2605 Rukaya Johaadien r.s.johaadien@nhm.uio.no user Camilla Svensen University in Tromsø Professor

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camilla.svensen@uit.no 0000-0001-9577-3935 author Malin Daase University in Tromsø Researcher

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malin.daase@uit.no 0000-0001-8413-3924 author Coralie Barth-Jensen University in Tromsø PhD student

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77645554 coralie.barth-jensen@uit.no 0000-0001-9318-2605 author Mateusz Ormańczyk IOPAN Researcher

ormanczyk@iopan.pl 0000-0003-2343-6694 author Sławomir Kwaśniewski IOPAN

kwas@iopan.pl 0000-0003-3104-0761 author Øystein Varpe University in Bergen Professor

Bergen NO

oystein.varpe@uib.no 0000-0002-5895-6983 author 2022-12-06 eng 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 Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml zooplankton meroplankton Svalbard fjord polar night abundances n/a This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. 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). 11.596 22.256 81.356 70.507 2017-01-06 2017-01-17 Bopyridae Isopoda Meganyctiphanes norvegica Thysanoessa inermis Thysanoessa longicaudata Thysanoessa raschii Sarsia Hydrozoa Hydrozoa larvae Dimophyes arctica Siphonophorae Beroe cucumis Mertensia ovum Nemertea pilidium Pelagobia Tomopteris septentrionalis Echinodermata larvae Bryozoa larvae Fritillaria borealis Decapoda Amphipoda Ctenophora Rotifera Turbelaria Acartia clausii Acartia longiremis Aetideidae Aetideopsis minor Bradyidius similis Calanus finmarchicus Calanus glacialis Calanus hyperboreus Candacia armata Clytmenestra scutellata Ctenocalanus Gaetanus tenuispinus Heterorhabdus norvegicus Jashnovia brevis Metridia longa species Metridia lucens Paracalanus/Clausocalanus/Ctenocalanus CIV-CV genus Paraeuchaeta species Pleuromamma robusta genus Pseudocalanus species Scolecithricella minor genus Spinocalanus Calanoida nauplii Cyclopoida nauplii Harpacticoida nauplii Clausocalanus Calocalanus styliremis Cyclopina schneideri Harpacticoida Microcalanus Microsetella norvegica Microsetella rosea Oithona atlantica Oithona similis Oithona nana Oncaeidae Paracalanus Aglantha digitale Bivalvia Cirripedia Clione limacina Erythrops erythrophthalma Eukrohnia hamata Euphausiacea Gastropoda veliger Limacina helicina Limacina retroversa Oikopleura Ostracods Polychaeta Sagitta elegans Themisto abyssorum notPlanned Coralie Barth-Jensen University in Tromsø PhD student

Postboks 6050 Langnes Tromsø 9037 NO

coralie.barth-jensen@uit.no 0000-0001-9318-2605 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). 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). 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. PNC17_Polar night cruise January 2017_Zooplankton abundances Coralie Barth-Jensen 0000-0001-9318-2605 owner Camilla Svensen 0000-0001-9577-3935 principalInvestigator 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 [244319]). MD received additional funding through NRC project Deep Impact [300333] and was supported by Tromsø Forskningsstiftelse (project Arctic ABC-East). 2022-01-27T14:15:27.960+00:00 dataset 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 76ef1883-c32a-49bb-a36c-2752af1b4e95/v1.2.xml