Metadata CatalogueMetadata Cataloguehttps://metadatacatalogue.lifewatch.eu/https://metadatacatalogue.lifewatch.eu//srv/eng/portal.opensearch https://metadatacatalogue.lifewatch.eu//srv/eng/rdf.search?any= engContinents, countries, sea regions of the world.https://metadatacatalogue.lifewatch.eu//srv/eng/thesaurus.download?ref=external.place.regionsecoportal.fos_1.rdfhttps://metadatacatalogue.lifewatch.eu//srv/eng/thesaurus.download?ref=external.ecoportal.fos3a23ed0c-8116-4baf-8d2d-4cafab15f173Arctic zooplankton size, flux and trait data from a long-term sediment trap time series in KongsfjordenThis data resource provides a comprehensive individual-level zooplankton dataset derived from a long-term sediment trap time series collected at the Mooring Dirigibile Italia (MDI) in Kongsfjorden, Svalbard, between 2016 and 2023. The resource comprises three complementary datasets: (i) taxonomic and morphometric observations, (ii) abundance and biomass flux estimates, and (iii) a categorical functional trait matrix. Overall, the resource contains 11,680 occurrence records representing 11,907 individuals collected from 101 sediment trap samples and assigned to 105 accepted taxa. The dataset includes holoplanktonic and meroplanktonic organisms, together with occasional benthic species captured by the sediment trap. For each occurrence, taxonomic identity, morphometric measurements, developmental stage, sex (when identifiable), and associated functional trait information are provided. Abundance and biomass fluxes were calculated for each sample, taxon, and life stage, enabling quantitative assessments of zooplankton export through the water column. Complementing these observations, a categorical functional trait matrix assigns each taxon to 13 morphological, behavioural, and life-history traits comprising 49 trait modalities. This multilevel biodiversity and functional data resource supports investigations of long-term variability in Arctic zooplankton biodiversity, body size, population structure, functional composition, and carbon export. By integrating taxonomic, morphometric, abundance, biomass, and functional trait information, the dataset provides a valuable foundation for trait-based ecological analyses, biodiversity assessments, and studies of pelagic ecosystem functioning. The harmonised use of Darwin Core and the Traits Thesaurus further ensures semantic interoperability and facilitates integration with other biodiversity data resources.Sediment trapArctic OceanKonsgfjordenBiodiversityZooplanktonTime seriesFunctional trait <http://www.opengis.net/def/crs/OGC/1.3/CRS84> Polygon((12.23783 78.91443, 12.23783 78.91443, 12.23783 78.91443, 12.23783 78.91443, 12.23783 78.91443)) DOIhttps://doi.org/10.48372/16GQ-Y365Info and download page on LifeWatch Italy Data Portalhttps://data.lifewatchitaly.eu/handle/123456789/326421Additional Informationhttps://metadata.iadc.cnr.it/geonetwork/srv/eng/catalog.search#/metadata/ac4adff6-2fe7-4bee-ac04-29c692d5a288National Research Council (CNR), Institute of Research on Terrestrial Ecosystems (IRET)National Research Council (CNR), Institute of Polar Sciences (ISP)English