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DEMNA : Diatoms samples from an ongoing monitoring network on surface waterbodies of Wallonia (since 2005)

Latest version published by Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA) on Jun 28, 2017 Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA)

This dataset refers to diatoms samplings performed in the frame of the Eu water framework directive. The microscope slides collection is created, implemented and maintened by the Hydrobiology unit at the Department for the Study of the Natural and Agricultural Environment (DEMNA- Public Service of Wallonia).

Phytoplankton samplings are based on an ongoing monitoring network comprising more than 440 surveyed stations distributed among the Wallonia (Southern Belgium) which started in 2005. Diatoms, with macrophytes ( doi:10.15468/cumtkq ), fishes ( doi:10.15468/jgddny ) and macroinvertebrates ( doi:10.15468/ew00u8 ), is one of the 4 biological indicator groups used to assess the biological quality of surface water masses. In the case of this collection, the monitoring and sampling designs are adapted to the calculation of the IPS (Index of Specific Pollusensibility) that is reported to Europe every year.

The dataset will be updated yearly, after the reporting to europe and its underlying validation work. We invite you to consult cigale ( geoapps.wallonie.be/CigaleInter/ ) to access the assessment results, or to adress specific requests to the DEMNA. please notice that this dataset does not replace any official convention on the provision of biological data delivered by the department.

Data Records

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 92,999 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.

Downloads

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 92,999 records in English (3 MB) - Update frequency: annually
Metadata as an EML file download in English (18 KB)
Metadata as an RTF file download in English (16 KB)

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Origin of the information: SPW-DGO3-DEMNA-Hydrobiology Unit

Rights

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.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 342219c6-cd6f-4294-b7ff-c2f5aae52a68.  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.

Keywords

Occurrence; Water Framework Directive; Diatoms; Wallonia; Monitoring; Freshwater; Belgium; phytoplankton; Specimen

Contacts

Who created the resource:

Maryse Msaaf
Principal adjoint
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
François Darchambeau
Attached
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Who can answer questions about the resource:

Maxime Coupremanne
Belgian Biodiversity Platform 22 Avenue de la faculté 5030 Gembloux Namur BE
Maryse Msaaf
principal adjoint
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Who filled in the metadata:

Maryse Msaaf
Principal adjoint
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Frédéric Cherot
Qualified attached
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Maxime Coupremanne
Belgian Biodiversity Platform 22 Avenue de la faculté 5030 Gembloux Namur BE

Who else was associated with the resource:

Principal Investigator
François Darchambeau
Attached
Department d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Geographic Coverage

Wallonia, southern Belgium

Bounding Coordinates South West [49.506, 2.94], North East [50.798, 6.341]

Taxonomic Coverage

Freshwater diatoms. The dataset includes more than 1240 taxa, belonging to 40 different families. The lowest taxanomic resolution is the genus, with only about 50 taxa concerned. The major part of the occurrences are species (more than 980 species) or infraspecific (more than 200 subspecies, forms, varieties).

Kingdom  Chromista (Brown algae lineage)
Phylum  Ochrophyta (Ochrophytes)
Class  Bacillariophyceae Dangeard, 1933 (Diatoms)

Temporal Coverage

Start Date / End Date 2005-06-17 / 2015-10-16

Project Data

This Directive covers a complex set of objectives, instruments and obligations. The directive is mainly concerned with the organization and management of water at the river basin level.

Title Water Framework Directive (FWD)
Identifier 2000/60/CE
Funding Countries are responsible for achieving the objectives of the Directive. In the context of this dataset, funding is provided by the Public Service of Wallonia (SPW).
Study Area Description Water bodies from Europe,Managed at the basin scale. According to six-year management cycles (2010-2015, 2016-2021, etc.). International or national basin districts have been delineated. These districts encompass not only the entire hydrographic network but also the drainage area and the estuaries, including groundwater, marine and related associated environments.
Design Description The aim of this Directive is to achieve a good biological and chemical quality of the waters masses. Attention is focused on: - the composition of fauna and flora - the amount of oxygen or nutrients (fertilizer) in the water - pH - Hydromorphological aspects (current,etc.) of river beds

The personnel involved in the project:

Principal Investigator
François Darchambeau

Sampling Methods

The sampling is preferably done on lotic facies, even if it is not the dominant facies. The lentic environments will be prospected only by default. Only the epilithic algae will be used, ie the living species on hard and inert substrates. The choice of the type of support to prospect can be hierarchized as follows: 1: Hard natural support as stable as possible, in order of preference; Stones, pebbles, pebbles. 2: Missing this: artificial hard support (platforms, bridge pillars, canalized river wall) .3: In the absence of any support or in the case of a particular study, artificial substrates (tile Faience, stone blocks). The sampling takes place on a surface of minimum 100 cc, square meters on the upper face of the support. Ideally, 5 stable natural supports are chosen randomly so as to have a sample of diatomic flora representative of the sampling station. The algae are harvested by scraping with a blade or a knife or by brushing and diluted with a little water and labeled. , Fix with a volume of 4% formalin which represents about 10% of the sample volume. Upon returning to the laboratory, samples are stored in a dark, cool place awaiting treatment and where they stay for at least 24 hours for decanting suspended solids.

Study Extent The monitoring network is composed of more than 440 control stations, distributed among the hydrographic districts of the Meuse, the Scheldt, the Rhine and the Seine (Wallonia areas). As far as possible, two annual campaigns, one between May and June (early summer) and one between September and October (late summer) are carried out.The early summer period provides, in principle, the most favorable estimation (dilution of pollutants, reduced microbiological activities). The late-summer period often corresponds to the most unfavorable conditions (the pollutants are less diluted, the activity of biodegradation is maximum). The samples are adapted to the reconstitution of a community sufficiently diversified and in equilibrium with the physicochemical conditions: carried out 15 days after floods of low intensity or 4 weeks after floods which resulted in a rearrangement of the supports.
Quality Control A set of constraints of the database ensure a first standardization of content (predefined taxa lists, habitat typology, etc.). OMNIDIA: a computer program with a large taxonomic database and allowing the calculation of several diatomic indexes whose IPS is used. The encoded data and computed indices are also subject to validation work before their transfer to Europe.

Method step description:

  1. Site selection
  2. Choice of facies and substrate to be sampled
  3. Diatoms sampling
  4. Labeling of the samples
  5. Pre-treatment (fix samples)
  6. Decantation in the laboratory
  7. Preparation and mounting of the microscope slides : Removal of organic matter (hydrogen peroxide 35%), Elimination of calcium carbonates (37% hydrochloric acid), rinsing, dilution and assembly of the microscope slides
  8. Identification and counting
  9. Storage of the microscope slides into the collection
  10. Importing the results into the unit'database : AQUABIO

Collection Data

Collection Name AQUABIO_DT
Collection Identifier DT
Parent Collection Identifier AQUABIO
Specimen preservation methods Microscopic preparation

Additional Metadata

Purpose Diatoms sampling are performed in the frame of the Eu water framework directive. Diatoms, with macrophytes, fishes and macroinvertebrates is one of the biological indicator groups used to assess the biological quality of surface water masses. The index determined is the Index of Specific Pollusensibility (IPS), which is reported to europe every year.
Maintenance Description Considering that the reporting involves a consequent validation work, and that the DEMNA only publishes validated data on GBIF, updates will be performed annually to stick to the data cycle schedule (data for 2016 will be published in early 2018, etc.).
Alternative Identifiers http://ipt.biodiversity.be/resource?r=demna-diatoms