'DEMNA-DNE : Occurrences of Diatoms (Bacillariophyceae) in running waters of Wallonia, Belgium' is a presence-only occurrence dataset resulting of the biological monitoring of surface water bodies carried out by the hydrobiology unit of the Département d'Etude du Milieu Naturel et Agricole and its partners (SPW-ARNE-DEMNA).
The diatoms monitoring is running since 2005, in order to assess the trends of the biological status of surface water bodies in Wallonia, together with macrohpytes, fishes and macro invertebrates indicators. The current monitoring network is composed of more than 440 sites, distributed among all streams from the hydrographic districts of the Meuse, the Scheldt, the Rhine and the Seine in Wallonia.
The monitoring is ongoing in the context of the EU Water Framework Directive, and thus follows standardised sampling protocols (IPS -Specific Pollution Sensitivity Index, according a methodology derived from the French standard AFNOR XP T90-354).
The data has been cleaned for quality issues prior to GBIF publication and thus is not prefectly comparable to the expertised data basis used for the IPS calculation and biological quality reporting. Please feel free to get in touch for any request or return regarding this dataset or the underlying monitoring work.
The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 125,374 records.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
The table below shows only published versions of the resource that are publicly accessible.
How to cite
Researchers should cite this work as follows:
Msaaf M, DEMNA-DNE hydrobiology unit and collaborators (2023). "DEMNA-DNE : Occurrences of Diatoms (Bacillariophyceae) in running waters of Wallonia, Belgium." Version 1.0. Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA). Occurrence dataset. https://ipt.biodiversity.be/resource?r=demnadiatoms&v=1.0
Researchers should respect the following rights statement:
The publisher and rights holder of this work is Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA). This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 658e39ee-33ea-40e5-b1d3-b0c0282e20d7. Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA) publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Belgian Biodiversity Platform.
Occurrence; diatoms; rivers; biological quality; Wallonia; DEMNA; algae; Observation
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The sampling network is composed of about 440 sites in Wallonia
|South West [49.506, 2.94], North East [50.978, 6.341]
|Chromista (Kelp, Diatoms, And Allies)
|Bacillariophyceae Dangeard, 1933 (diatoms)
|Start Date / End Date
|2005-06-17 / 2021-11-16
The sampling methodology is derived from the french standard (NF T90-354). Sampling is generally carried out on well-lit sections, preferably on submerged stones, pebbles or boulders, so as to present a diatomic population representative of environmental conditions. Biofilm is collected by scraping the substrate surface with a toothbrush or scraper over a total area of at least 100 cm².
|The current monitoring network is composed of more than 440 sampling stations distributed among the Wallonia. The concerned habitats include lentic and lotic brooks, streams, largest rivers and canals from the hydrographic districts of the Meuse, the Scheldt, the Rhine and the Seine.
|The Department is ISO9001 certified. Some sampling was performed by external contractors, also certified. Data are submitted to a procedural validation by experts during samling, sorting, identification and encoding of records within the AQUABIO database.
Method step description:
- Choice of surfaces to be sampled
- Diatom film sampling according to NF T90-354 standard
- Recovery of the biofilm in a pillbox with alcohol
- Mounting on microscope coverslips
- Identification and counting
- Import of the samling results into the AQUABIO Database
- Control and validation of content
- Cleaning and DarwinCore transformation of validated data and publication to GBIF
|the dataset will be updated annually, to incorporate validated field season data.