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Phytoplankton data for Danish marine monitoring (ODAM) from 1985 - 2016
Danish Centre for Environment and Energy (2017). Phytoplankton data for Danish marine monitoring (ODAM) from 1985 - 2016
Contact: Rytter, David

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Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Data is an assembly of plankton monitoring stations situated between 54° and 58° North along the Danish coasts and in estuaries. There are multiple phytoplankton stations and 15 of them are maintained by 2016, although the data set also contains data of several discontinued stations. Each phytoplankton station is visited 1 to 4 times per month over a period of 25 years for some of the stations (two times per month is the norm). Samples are analyzed to estimate phytoplankton composition and abundance. The cell volume is determined for a sub group of cell of each species encountered, thus estimating a cell volume that is applied to the entire sample, in case biomass is estimated. more

The stations can be categorized as ‘open water’ stations or estuarine stations. The open water stations are all located in the “open” waters of the Kattegat – Belt Sea area (average depth 27.1 m ± std. dev16.4 m) forming the transition zone between the Baltic Sea and the North Sea. The water column at those stations is permanently stratified (Lyngsgaard et al. 2014) and the samples were collected from the mixed upper 10 meters that is periodically nutrient limited. Two stations were in the Wadden Sea, a shallow and turbid tidal area adjacent to the North Sea on the West Coast of Jutland. The remaining stations are located in shallow (average depth 7.9 m ± 6.5 m) estuaries with significant freshwater and hence nutrient inputs.

Salinities vary between 2 and 31. The highest salinities were found in the Wadden Sea and Nissum Bredning and the lowest are close to the Baltic Sea or in enclosed estuaries. Data covered the period from 1989 to 2016. Over this period nutrient supply has decreased significantly, by 43 percent for nitrogen and by about 90 percent for phosphorous.

Sampling, measurements and laboratory analyses were carried out by a number of different agencies but followed a common set of technical guidelines to ensure consistency. These guidelines are written in Danish language by are in-line with the guidelines given in the appropriate sections of the HELCOM COMBINE manual.

Biology > Plankton > Phytoplankton
Marine, Brackish water, Terrestrial, ANE, Belt Sea, ANE, Danish Exclusive Economic Zone, ANE, Kattegat, ANE, North Sea

Geographical coverage
ANE, Belt Sea [Marine Regions]
ANE, Danish Exclusive Economic Zone [Marine Regions]
ANE, Kattegat [Marine Regions]
ANE, North Sea [Marine Regions]

Temporal coverage
January 1985 - December 2016

Occurrence of biota

University of Aarhus; Danish Centre For Environment And Energy (DCE), moredata creator

Related datasets
Parent dataset:
ODAM: Danish national database for marine data, more
Published in:
EurOBIS: European Ocean Biogeographic Information System, more
Previous version:
MADS - Marine phytoplankton, more

Based on this dataset
Jakobsen, H.H.; Markager, S. (2016). Carbon-to-chlorophyll ratio for phytoplankton in temperate coastal waters: Seasonal patterns and relationship to nutrients. Limnol. Oceanogr. 61(5): 1853-1868., more
Jakobsen, H.H. et al. (2015). Estimating time series phytoplankton carbon biomass: Inter-lab comparison of species identification and comparison of volume-to-carbon scaling ratios. Est., Coast. and Shelf Sci. 162: 143-150., more
Lyngsgaard, M.M. et al. (2017). How well does chlorophyll explain the seasonal variation in phytoplankton activity? Est. Coast. 40(5): 1263-1275., more
Henriksen, P. (2009). Long-term changes in phytoplankton in the Kattegat, the Belt Sea, the Sound and the western Baltic Sea. J. Sea Res. 61(1-2): 114-123., more

Dataset status: In Progress
Data type: Data
Data origin: Monitoring: field survey
Metadatarecord created: 2017-06-26
Information last updated: 2017-06-26
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