• HELCOM Metadata catalogue
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Seasonal succession of dominating phytoplankton groups HOLAS 3

The indicator evaluates the coincidence of seasonal succession of dominating phytoplankton groups over an assessment period (commonly 5-6 years) using regionally established reference seasonal growth curves and wet weight biomass data. The indicator result value is based on the number of data points falling within the acceptable deviation range set for each monthly point of the reference growth curve and expressed as the percentage to the total number of data points. This result value is then compared to regionally relevant threshold values established to represent acceptable levels of variation. Strong deviations from the reference growth curves will result in failure to meet the thresholds set for acceptable variation, indicating impairment of the environmental status and a failure to meet good status.


Seasonal succession of dominating phytoplankton groups displays the result of the indicator in HELCOM Assessment Scale 3 (Division of the Baltic Sea into 17 sub-basins and further division into coastal and offshore areas).


Attribute information:

"HELCOM_ID" = HELCOM ID of the HELCOM scale 3 assessment unit

"country" = Country

"level_2" = Name of HELCOM scale 2 assessment unit

"level_3" = Name of HELCOM scale 3 assessment unit

"Area (km2)" = Area of HELCOM assessment unit

"Overall Score" = Indicator value or result

"Info" = additional info

"AULEVEL" = Assessment unit level used for the indicator

"Status" = Status of the indicator (“Achieve”, “Fail” or “Not assessed”)

"Assessment" = Assessment unit name

"Reference period" = Reference period(s)

"Threshold value" = Threshold value (overall)

"Indicator cyanobacteria" = Indicator value for cyanobacteria

"Indicator dinoflagellates" = Indicator value for dinoflagellates

"Indicator diatoms" = Indicator value for diatoms

"Indicator Mesodinium rubrum" = Indicator value for Mesodinium rubrum

"Indicator green algae" = Indicator value for green algae

Simple

Date (Creation)
2023-03-18
Unique resource identifier
https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/e95f8d7a-2051-43b3-9faf-88f7c3375512
pointOfContact
  HELCOM Secretariat

GEMET - INSPIRE themes, version 1.0

  • Habitats and biotopes

GEMET

  • phytoplankton

Keywords
  • MADS

  • HOLAS3

  • Core indicator

Use constraints
Other restrictions
Other constraints

Use constraints: Data can be used freely given that the source is cited (following creative commons license CC-BY). The source should be cited as: “HELCOM HOLAS 3 Dataset (2023)"

Access constraints
Other restrictions
Other constraints
Access constraints: No limitations on public access.
Spatial representation type
Vector
Metadata language
English
Topic category
  • Environment
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Begin date
2016-01-01 Unknown
End date
2021-12-31 Now
Unique resource identifier
EPSG:3035
Distribution format
  • ESRI Shapefile ( 1.0 )

OnLine resource
Download Seasonal succession of dominating phytoplankton groups HOLAS 3 ( WWW:LINK-1.0-http--link )
OnLine resource
View Seasonal succession of dominating phytoplankton groups HOLAS 3 ( WWW:LINK-1.0-http--link )
Hierarchy level
Dataset

Conformance result

Date (Publication)
2010-12-08
Statement

The methods of collection, counting and identification should be unified between all laboratories sharing the same assessment area. Data has been collected directly from the persons responsible for phytoplankton monitoring, no common database was currently used. Currently the HELCOM COMBINE database hosted by ICES does not contain biomass values of dominating groups and is thus unsuitable.


The indicator can be updated either annually or for specific periods (e.g. for certain 6-year assessment periods) to detect reliable trends in seasonal dynamics on dominant phytoplankton groups.


Additional information:

http://www.helcom.fi/baltic-sea-trends/indicators/seasonal-succession-of-dominating-phytoplankton-groups


Link to metadata of dataset used for indicator calculation: https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/6992f43e-0e01-461b-8503-702a058bb214

File identifier
e95f8d7a-2051-43b3-9faf-88f7c3375512 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2023-04-14T14:10:14
pointOfContact
  HELCOM Secretariat
 
 

Overviews

Spatial extent

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S
E
W
thumbnail


Keywords

GEMET
phytoplankton
GEMET - INSPIRE themes, version 1.0
Habitats and biotopes

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Associated resources

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