d48f862e-9f27-4fed-9712-34e6d351e89c English HELCOM Secretariat data@helcom.fi 2023-03-18T03:45:24 EPSG:3035 Diatom-dinoflagellate ratio 2018 (HOLAS 2) 2018-06-28 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/d48f862e-9f27-4fed-9712-34e6d351e89c The Diatom/Dinoflagellate index (Dia/Dino index) reflects the dominance patterns in the phytoplankton spring bloom. It has high relevance for the pathway of the food into the pelagic or benthic food web. In principle, the indicator is applicable in all coastal and open sea assessment units, except lagoons, large river plumes and the Bothnian Bay; however, thresholds for the good status are defined only for the southern and central Baltic Sea up to now. The indicator is not yet agreed as a HELCOM core indicator but is tested in the HOLAS II project for the Eastern Gotland Basin. In this assessment unit, the average Dia/Dino index of the years 2011-2016 was just below the threshold value of 0.5 for good status. The confidence of the indicator evaluation depends on the data frequency. The data have to represent the diatom and dinoflagellate blooms adequately. If the diatom bloom is not sufficiently represented in the data, an alternative Dia/Dino index may be applied, based on silicate consumption data. This indicator is robust; its calculation is simple and traceable. The phytoplankton monitoring is operational in the whole Baltic Sea using methods prescribed in the COMBINE manual. Currently, a high quality of the data is assured by the experts of the HELCOM Phytoplankton Expert Group (PEG). The basic data are phytoplankton biomass data, determined as explained in the HELCOM COMBINE manual, originating from the depth of 0 – 10 m. Also silicate data were used that were taken parallel to the phytoplankton sampling. Diatom-dinoflagellate ratio dataset displays the result of the indicator in HELCOM Assessment Scale 2 (Division of the Baltic Sea into 17 sub-basins). Attribute information: "HELCOM_ID" = ID of the HELCOM scale 2 assessment unit "Area (km2)" = Area of the HELCOM assessment unit "Name" = Name of the HELCOM scale 2 assessment unit "Status" = Status of the indicator (“Achieve”, “Fail” or “Not assessed”) "Threshold value" = Threshold value of indicator "Unit" = Unit of the indicator "Indicator value" = Result of the indicator "AULEVEL" = Assessment unit level used for the indicator HELCOM Secretariat data@helcom.fi Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS2 2018 Core indicator Core indicator Use constraints: The data and resulting data products (tables, figures and maps) available on the indicator web page can be used freely given that the source is cited. The indicator should be cited as following: HELCOM (2018) Diatom-dinoflagellate ratio. HELCOM core indicator report. Online. [Date Viewed], [Web link]. Access constraints: No limitations on public access. English environment 7.526438 33.796674 52.535858 66.424283 2011-01-01 2016-12-31 ESRI Shapefile 1.0 https://maps.helcom.fi/website/MADS/download/?id=d48f862e-9f27-4fed-9712-34e6d351e89c WWW:LINK-1.0-http--link Download dataset https://maps.helcom.fi/website/mapservice/?datasetID=d48f862e-9f27-4fed-9712-34e6d351e89c WWW:LINK-1.0-http--link Open in Map Viewer Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 The data of the HELCOM Contracting Parties are kept in the HELCOM COMBINE database, hosted by ICES (www.ices.dk). However, it turned out that the data are incomplete. Therefore, the original data were directly received from the contributors (see below). The evaluation of the southern part of the Eastern Gotland data was supported by the National Marine Fisheries Research Institutes (NMFRI) statutory activity and Polish National Environmental Monitoring (PMS). Further data originated from the Leibniz Institute of Baltic Sea Research Warnemünde (IOW), Swedish Meteorological and Hydrological Institute, Västra Frölunda (SMHI), Estonian Marine Institute, University of Tartu (EMI), and Environmental Protection Agency, Department of Marine Research, Klaipeda. Additional information: http://www.helcom.fi/baltic-sea-trends/indicators/Diatom-dinoflagellate-index Link to metadata of dataset used for indicator calculation: http://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/2f105687-8876-4596-949c-ba902281c6e2