https://doi.pangaea.de/10.1594/PANGAEA.995904Niedzwiedz, SarinaSarinaNiedzwiedz0000-0003-2604-2527University of BremenMurray, AylaAylaMurray0000-0002-9134-7768Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenBeckschulte, PaulaPaulaBeckschulteUniversity of BremenMonteiro, CátiaCátiaMonteiroCentro de Investigação em Biodiversidade e Recursos GenéticosRuiz, Micaela BelenMicaela BelenRuiz0000-0003-1278-8248Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenDescôteaux, RaphaëlleRaphaëlleDescôteauxUniversity Centre in SvalbardArmitage, PhoebePhoebeArmitageÅbo Akademi UniversityBoström, ChristofferChristofferBoström0000-0003-2845-8331Åbo Akademi UniversityHavermans, CharlotteCharlotteHavermans0000-0002-1126-4074Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenKuliński, KarolKarolKulińskiInstitute of Oceanology Polish Academy of SciencesBischof, KaiKaiBischof0000-0002-4497-1920University of BremenPANGAEA2026ArcticCNFucus distichusFv/FmPigmentsSaccharina latissimaSvalbardEvent labelSpeciesStation IDDATE/TIMELATITUDELONGITUDEReplicatesMaximum quantum yield of photosystem IIChlorophyll c2, per dry massFucoxanthin, per dry massViolaxanthin, per dry massAntheraxanthin, per dry massZeaxanthin, per dry massChlorophyll a, per dry massbeta-Carotene, per dry massViolaxanthin + Antheraxanthin + Zeaxanthin, per dry mass(Violaxanthin + Antheraxanthin + Zeaxanthin)/Chlorophyll a ratioDe-expoxidation state of xanthophyll cyclePigments, accessoryPigments, accessory/Chlorophyll a ratioNitrogenCarbonCarbon/Nitrogen ratioMultiple investigationsPortable Chlorophyll Flourometer, Heinz Walz GmbH, Effeltrich, Germany, PAM-2100High performance liquid chromatography (HPLC), Chromaster systems; with autosampler (chilled) 5260; with DA-detector 5430; with column oven 5310, VWR-Hitachi International GmbHElemental Analyser (EA), EuroVector S.P.A., Milano, Italy, Euro EA 30002024-08-20T00:00:00/2024-08-26T00:00:00Dataset10.1594/PANGAEA.9959231712 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalData access is restricted (moratorium, sensitive data, license constraints)To investigate the response of Fucus distichus and Saccharina latissima to local environmental conditions along the Woodfjorden gradient in Svalbard, field sampling was conducted in August 2024. Specimens of both species were collected at ten sampling stations distributed along the fjord. The intertidal brown alga Fucus distichus was found at six of the ten stations and was collected by hand during low tide. Meristematic apical tips were cut for further analysis. The subtidal kelp Saccharina latissima was present at nine of the ten stations. At each station, sporophytes of similar size were collected from a water depth of 5 ± 2 m using a plant rake (Plant Rake 19.000, according to Sigurd Olsen, KC Denmark, Silkeborg, Denmark). Circular discs of meristematic tissue (2 cm²) were cut from the basal blade approximately 10 cm above the stipe for further analysis. The maximum quantum yield of photosystem II (Fv/Fm) was determined using a pulse-amplitude-modulated fluorometer (Portable Chlorophyll Fluorometer PAM-2100, Heinz Walz GmbH, Effeltrich, Germany) after 5 min of dark acclimation (n = 7–11 per station and species). Subsequently, all tissue samples were dried in silica gel, which was replaced regularly to ensure complete desiccation. Pigment composition was analyzed by high-performance liquid chromatography (HPLC; Chromaster® system with chilled autosampler 5260, DAD detector 5430, and column oven 5310; VWR-Hitachi International GmbH, Darmstadt, Germany) (n = 5 per station and species). Total carbon and total nitrogen contents were determined using an elemental analyzer (Euro EA 3000 Elemental Analyzer, EuroVector S.P.A., Milan, Italy) (n = 5 per station and species).13.27130214.22813379.32620279.70965WoodfjordenEuropean Commissionhttps://doi.org/10.13039/501100000780101136480Blue Carbon production, export and sequestration in emerging polar ecosystems (SEA-Quester)Horizon 2020 of the European Commissionhttps://doi.org/10.13039/501100007601869154The future of Arctic coastal ecosystems - Identifying transitions in fjord systems and adjacent coastal areas (FACE-IT)