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Charophyte distribution

Distribution of Charophytes (Chara spp., Nitella spp., Nitellopsis spp., Tolypella spp.) mainly based on data submission by HELCOM contracting parties. Submitted point data was originally gathered in national mapping and monitoring campaigns, or for scientific research. Also scientific publications were used to complement the data (in Curonian, Vistula and Szczechin lagoons, see reference list). Polygon data from Poland was digitized based on Polish Marine Atlas. From Estonian waters, a predictive model was used (200m resolution), that was converted to presence/absence using minimized difference threshold (MDT) criteria. All data (points, polygon and the raster presenting predicted presence of Charophytes) were generalized to 5km x 5km grid cells.

Simple

Date (Publication)
2018-01-15
Unique resource identifier
https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/822ddece-d96a-4036-9ad8-c4b599776eca
pointOfContact
  HELCOM Secretariat

GEMET - INSPIRE themes, version 1.0

  • Species distribution

  • Habitats and biotopes

GEMET

  • environment

Keywords
  • MADS

  • HOLAS2

  • ecosystem component

Use constraints
Other restrictions
Other constraints

Use constraints: Data can be used freely given that the source is cited followingly: HELCOM HOLAS II Dataset: Charophyte distribution (2018)

Access constraints
Other restrictions
Other constraints
Access constraints: No limitations on public access.
Spatial representation type
Grid
Metadata language
English
Topic category
  • Environment
  • Biota
N
S
E
W
thumbnail


Begin date
2004-01-01
End date
2016-12-31
Unique resource identifier
EPSG:3035
Distribution format
  • TIFF ( )

OnLine resource
Download dataset ( WWW:LINK-1.0-http--link )
OnLine resource
Open in Map Viewer ( WWW:LINK-1.0-http--link )
Hierarchy level
Dataset

Conformance result

Date (Publication)
2010-12-08
Statement

Data source:

Denmark: Point data from national monitoring along transects (dive and video), data from 2005-2015. Data is available through Miljøportalen

Estonia: Modelled distribution of Charophytes based on observations from national monitoring (dive and drop video) during 2005-2014

Finland: Point data gathered during the national marine mapping programme VELMU (2004-2015) and inventories from Åland Islands.

Germany: Point data originally collated for monitoring and research purposes (video, photos, dive, wading, snorkeling), data from 2010-2015.

Latvia: No reported occurrences of Charophytes

Lithuania: No reported occurrences of Charophytes.

Poland: Polygon data digitized based on Polish Marine Atlas http://www.iopan.gda.pl/hm/atlas/Atlas_all.pdf .

Russia: No reported occurrences of Charophytes.

Sweden: Point data from national monitoring and mapping surveys (1995 -2015) extracted from SMHI SHARK database.


References:

Brzeska, P. Wozniczka, A., Pelechaty, M., Blindow, I. 2015. New records of Chara connivens P. Salzmann ex A. Braun 1835 – an extremely rare and protected species in Polish brackish waters. Acta Societatis Botanicorum Poloniae. 84(1):143–146.

Sinkevièienë, Z. 2004. Charophyta of the Curonian lagoon. Botanica Lithuanica 10(1):33-57.


2018 updates: Updated data from Sweden and Finland were included. The grid of the raster was changed to match with other benthic habitat layers used in HOLAS II.


Data quality:

Mapping is not exhaustive and sampling density varies between the countries.


Raster value representing presence (1) or absence (0)


Spatial resolution: 1 km x 1 km grid (originally 5 x 5 km).

File identifier
822ddece-d96a-4036-9ad8-c4b599776eca XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2023-11-10T14:23:24
pointOfContact
  HELCOM Secretariat
 
 

Overviews

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET
environment
GEMET - INSPIRE themes, version 1.0
Habitats and biotopes Species distribution

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Associated resources

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