The Biological Station Helgoland holds one of the largest and longest marine plankton time series in Europe, named 'Helgoland Roads' after the sampling location. This time series has been running continuously, with samples taken on a work-daily basis since 1962. As far as possible species counts are carried out at species level. This has allowed us to show long-term changes in abundance and seasonality of different organisms, but also to reliably demonstrate the appearance of species entirely new in the Helgoland Roads phytoplankton community. More complex analyses have also shown long-term shifts in diversity and delays in the start of the spring bloom after warm autumn/winter seasons.
","EngDescr":"Since 1962, phytoplankton data has been collected several times a week and recorded qualitatively and quantitatively using the Uthermöhl method.
","OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":null,"EmbargoDate":null,"OrigDescrLangNL":null,"OrigLangCode":null,"OrigLangCodeExtended":null,"OrigLangID":null,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":null,"AccessConstraints":null,"UDate":"2026-10-22","CDate":"2004-07-02","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-10-22 12:36:03.129788","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":1,"MarineFlag":1,"FreshFlag":null,"BrackishFlag":null,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Monitoring: field survey","Progress":"In Progress","AccessConstraint":"Restricted","AccConstrEN":"Restricted","AccConstrDisplay":null,"License":null,"AccConstrDescription":"The data are withheld from general circulation and disclosure but access may be obtained on a case-by-case basis through negotiation","Lineage":null,"AccConID":9},"dois":null,"spcols":[{"SpColID":95,"SpName":"Biomare"},{"SpColID":552,"SpName":"EMODNET"},{"SpColID":38,"SpName":"Marine Biodiversity and Ecosystem Functioning"},{"SpColID":620,"SpName":"not available through EurOBIS"}],"keywords":[{"ThesaurusTerm":"ANE, Germany, Helgoland","ThesTypID":34,"ThesType":"ASFA Geoterms","Code":null,"Description":null,"OrigThesTerm":"ANE, Germany, Helgoland","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Data","ThesTypID":8,"ThesType":"Assemble KO Types","Code":null,"Description":null,"OrigThesTerm":"Data","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Long-term monitoring","ThesTypID":0,"ThesType":null,"Code":null,"Description":null,"OrigThesTerm":"Long-term monitoring","DutchTerm":"Lange termijn monitoring","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Marine Genomics","ThesTypID":10,"ThesType":"Assemble Sectors","Code":null,"Description":null,"OrigThesTerm":"Marine Genomics","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Phytoplankton","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_13344","Description":null,"OrigThesTerm":"Phytoplankton","DutchTerm":"Fytoplankton","URI":"http://aims.fao.org/aos/agrovoc/c_13344","DasKeywordDescr":null}],"parents":[{"DasID":305,"Acronym":null,"EngAbstract":"The Helgoland Roads time-series, located at the island of Helgoland in the German Bight, approximately 60 km off the German mainland (54 11'N 7 54'E), is one of the richest temporal marine datasets available. The data set comprises a phytoplankton time series (started in 1962 and sampled daily) and a zooplankton time series (started in 1975 and sampled three times a week) along with time series for inorganic nutrients, salinity and temperature and several shorter time series (e.g. Chlorophyll and other data from ferrybox systems).
The high sampling frequency of the Helgoland Roads time series has provided a unique opportunity to study long-term trends in abiotic and biotic parameters, but also ecological phenomena, such as seasonal interactions between different food web components, niche properties, and the dynamics and timing of the spring bloom. It has also facilitated close examination of the dynamics of new species appearing in the local ecosystem.
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