DEMNA-DNE : Occurrences of benthic macroinvertebrates in running waters of Wallonia, Belgium

Dernière version Publié par Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA) le Apr 30, 2020 Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA)

"DEMNA: Occurrences of macroinvertebrates in running waters of Wallonia" is an occurrence-only dataset created by the Hydrobiology unit of the Direction de la Nature et de l’Eau [Département de l'Étude du Milieu Naturel et Agricole (SPW-DEMNA-DNE)].

The data come from an ongoing network for the monitoring of the biological quality of running waters in Wallonia maintained under the Water Framework Directive of European Union (Directive 2000/60/CE) (European Council, 2000). The current monitoring network is composed of more than 400 sites, distributed among all streams (brooks to largest rivers/canals) from the hydrographic districts of the Meuse, the Scheldt, the Rhine and the Seine in Wallonia. Macroinvertebrates are one of the 4 indicator groups used to assess the biological quality with macrophytes, diatoms, and fishes. The macroinvertebrate occurrences are obtained by the analysis of standardized IBGN/IBGA samplings, done according a methodology derived from T90-350 (2004) French standard (see Vanden Bossche & Usseglio-Polatera, 2005 in Hydrobiologia, 551: 253-271). Some taxa encountered during the monitoring are not included into this GBIF dataset (when identification level is particularly imprecise, i.e. higher than family E.G: 'poriferans', 'Bryozoa', etc...).

More information and macroinvertebrate samples are available upon request addressed to the DEMNA.

Enregistrements de données

Les données de cette ressource occurrence ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 134,201 enregistrements.

Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées des ressources sont disponibles au téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.

Téléchargements

Téléchargez la dernière version de la ressource en tant qu'Archive Darwin Core (DwC-A), ou les métadonnées de la ressource au format EML ou RTF :

Données sous forme de fichier DwC-A (zip) télécharger 134,201 enregistrements dans Anglais (2 MB) - Fréquence de mise à jour: annuel
Métadonnées sous forme de fichier EML télécharger dans Anglais (26 KB)
Métadonnées sous forme de fichier RTF télécharger dans Anglais (21 KB)

Versions

Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.

Comment citer

Les chercheurs doivent citer cette ressource comme suit:

Hydrobiology Unit (2019)- DEMNA-DNE : Occurrences of benthic macroinvertebrates in running waters of Wallonia (1990-2016). v1. Service Public de Wallonie – Département de l’Etude du Milieu naturel et agricole (SPW – DEMNA). Dataset/Occurrence.

Droits

Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est 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.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 59b549c0-7da9-4095-98c1-56da90837723.  Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA) publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du Belgian Biodiversity Platform.

Mots-clé

Occurrence; Surface Waters; DEMNA; Wallonia; Macroinvertebrates; Rivers; Specimen

Contacts

Personne ayant créé cette ressource:

François Darchambeau
Unit director
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Frédéric Chérot
Expert
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
- All members of the Hydrobiology Unit (DEMNA-DNE)
Officers
Département d'étude du milieu naturel et agricole BE

Personne pouvant répondre aux questions sur la ressource:

Maxime Coupremanne
Data liaison officer
Belgian Biodiversity Platform Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Frédéric Chérot
Expert
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
François Darchambeau
Unit director
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Personne ayant renseigné les métadonnées:

Frédéric Chérot
Expert
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Autres personnes associées à la ressource:

Chercheur Principal
François Darchambeau
Unit director
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Fournisseur de Contenu
Frédéric Chérot
Expert
Département d'étude du milieu naturel et agricole Avenue Maréchal Juin 23 5030 Gembloux Namur BE
Fournisseur de Contenu
Etienne Delooz
Expert
Université Libre de Bruxelles BE
Fournisseur de Contenu
Roger Cammaerts
Expert
Département d'étude du milieu naturel et agricole BE
Fournisseur de Contenu
Pierre Gérard
Expert
Département d'étude du milieu naturel et agricole BE
Fournisseur de Contenu
Frédéric Grisez
Expert
Département d'étude du milieu naturel et agricole BE
Fournisseur de Contenu
Guy Josens
Expert
Université Libre de Bruxelles BE
Fournisseur de Contenu
Christine Keulen
Expert
Département d'étude du milieu naturel et agricole BE
Fournisseur de Contenu
Sébastien Richez
Expert
Département d'étude du milieu naturel et agricole BE
Fournisseur de Contenu
Jean-Pierre Vanden Bossche
Expert
Département d'étude du milieu naturel et agricole BE
Publicateur
Maxime Coupremanne
Data liaison officer
Belgian Biodiversity Platform Avenue Maréchal Juin 23 5030 Gembloux Namur BE

Couverture géographique

Wallonia, Southern Belgium.

Enveloppe géographique Sud Ouest [49.506, 2.909], Nord Est [50.842, 6.342]

Couverture taxonomique

Freshwater macroinvertebrates from Wallonia. The observations include 644 taxa, mainly Arthropoda and Molluscs, identified at the following levels: species (225), genera (249) and famillies (170) in the last version.

Kingdom  Animalia (Animals)
Phylum  Annelida (Ringed worms),  Arthropoda (Arthropods),  Cnidaria (Cnidarians),  Mollusca (Molluscs),  Platyheminthes (Flat worms),  Porifera (Sponges)

Couverture temporelle

Date de début / Date de fin 1990-01-15 / 2018-10-24

Méthodes d'échantillonnage

The T90-350 (2004) French standard describing the “Indice Biotique Global Normalisé” (IBGN) provides for sampling (with a Surber net and at hand) 8 microhabitats on each site, i.e. 8 areas of watercourse having a well-defined bottom substrate and surface velocity.

Etendue de l'étude The current monitoring network is composed of more than 400 sampling sites 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 current network and method designs were set up in 2004, but the dataset also includes older data coming from different sampling events performed by the hydrobiology unit since 1990. Given the methodologies used for collecting samples (cf. infra), only information on the presence of species (positive occurrence) can be drawn from it, nothing can be concluded from absences.
Contrôle qualité The Department is ISO9001 certified.

Description des étapes de la méthode:

  1. [Sampling Shallow watercourses, possible to walk] - methodology derived from French IBGN: The site is defined as a section of the watercourse equal to about ten times the width of the wet bed. Practically, the water course section length must be adapted to sample eight different microhabitats. For the small brooks (width inferior to one meter), this value of ten times the width defined in T90-350 (2004) French standard is frequently too low and for the wide streams (width superior to about twenty meters) it is unnecessarily high. Practically, the length of the site varies generally between 20 and 30 m. Ideally, each microhabitat selected for sampling is characterized by well-defined bottom substrate and surface velocity areas, the 8 microhabitats being distributed between lotic and lentic zones, between mineral and vegetable substrates, between the bed, the left and the right banks. The substrates of microhabitats (and then the microhabitats themselves) are selected according to a decreasing order of habitability as defined in T90-350 (2004) French standard. Each microhabitat or substrate-velocity area is sampled 1 to 5 times through the site (and not just one time as in the French standard), depending on the substrate, using a push net (‘Haveneau’) with a maximum 500µm mesh size. In the derived methodology used in Wallonia, the litters are sampled by kick sampling one time, the roots and macrophytes three times, the stones and pebbles five times for the same surface velocity category [the velocity categories A-E being defined according to T90-350 (2004) French standard]. Consequently, the final sample includes three or five replicates for some substrates. A surface of substrate equivalent to 1/20 m² (about 20*25 cm) is sieved by the operator for each replicate. Net samples, usually composed of a mixture of plants, mineral fragments, and macroinvertebrates, are dumped into a bucket of water once this part of the sampling is completed. Independently, a tuft of Bryophytes, 10-20 stones and 1-3 blocks (stones and blocks each equivalent to 1/20 m²), are collected at hand in a lotic and in a lentic areas of the site, transferred in a bucket and “cleaned” to detach the fixed animals. The solid contents of both buckets are removed with a 500 μm mesh sieve. The sieve is then held in a light stream of water to remove the fine elements (vase, fine sand, etc.) and the largest debris are eliminated. Afterwards, the remaining contents of the sieve are introduced into a labelled flask (numbered with the site code, dated etc.). Subsample of fragile or very small sized organisms (mainly Plecoptera and Ephemeroptera) and organisms easily destroyed by freezing (flat worm, earthworm) are packaged separately in ethanol, itself introduced in the labelled flask.
  2. [Sampling Deep watercourses] : In deep watercourses, such the Meuse or the Scheldt, where the kick and hand samplings are impossible or very difficult, an adapted methodology corresponding to French “Indice Biotique Global Adapté” (IBGA) is used. It differs essentially of the methodology for shallow watercourses by the length of the site (about 1000m), by the use of (3) artificial substrates to replace the kick sampling and by the use of a dredger to explore the river bed from a small boot. Artificial substrates are standardized in size bags full of stones and pebbles, submerged in the watercourse for about 5-6 weeks and fixed on the bank by a rope (fastened to a tree or a tent peg). The artificial substrates work as small traps, being attractive for numerous organisms in an environment generally poor in stones, a minimal delay for colonization being necessary. When the delay is elapsed, the artificial substrates are removed of water and their content “cleaned” at hand in buckets to extract all organisms. The solid contents of buckets are then removed with a 500 μm mesh sieve. The sieve is held in a light stream of water to remove the fine elements (vase, fine sand, etc.) and the largest debris are eliminated. Afterwards, the remaining contents of the sieve are introduced into a labelled flask (numbered with the site code, dated etc.). Subsample of fragile or very small sized organisms (mainly Plecoptera and Ephemeroptera) and organisms easily destroyed by freezing (flat worm, earthworm) are packaged separately in ethanol, itself introduced in the labelled flask. Other groups (Bryozoans etc.): Family level (or higher level, in this case the data not included in GBIF dataset).
  3. [Samples transport] : The flasks including the samples are carried in a fridge from field to laboratory and freezed to minus 18° at laboratory.
  4. Laboratory treatment of samples
  5. [Laboratory treatment 1 - identification of organisms] : According to T90-350 (2004) French standard, organisms must be identified at family level except for some difficult groups treated at a higher rank (Acarina, Nematoda etc.) However, to be able to follow some recent changes in macroinverteabrate communities of Walloon watercourses following mainly from arrival of exotic (invasive) species, (at least a subsample of) different taxa are identified at genus or species level. The present identification level per taxon is the following: Crustaceans: Species level, Flatworms: Species level, Insects: Level variable depending to the order: Ephemeroptera: Genus level (except Caenidae, Ephemerellidae, Ephemeridae, Polymitarcidae, Potamanthidae and Sipholnuridae at species level), Coleoptera: Family level, Diptera: Family level (except Athericidae and Stratiomyiidae at species level), Heteroptera: Species level for adults, genus or family level for nymphs, Megaloptera: Species level, Odonata: Genus level, Plecoptera: Genus level (except Perlidae at species level), Trichoptera: Family level (except Ecnomidae, some Hydropsychidae and Odontoceridae at species level), Other orders: Family level. Leechs: Genus level (except Erpbodellidae at family level, some Glosiphoniidae and Piscicolidae at species level), Molluscs: Species level.
  6. [Laboratory treatment 2 - The sorting of organisms] : Animals collected in the samples must be separated of debris (plants fragments, small stones, sand, vase) and stored in 70-80% denatured ethanol, a long and difficult task. First, each sample is thawed in water, then transferred on a (or several depending its size) column(s) of sieves partially submerged in water and cleaned with a fine water jet. Content of each sieve of same mesh is transferred independently in a tray, subdivided in smaller trays and the organisms sorted individually with entomological forceps to be stored in ethanol until identification.
  7. [Laboratory treatment 3 - Data encoding and determination of site biological quality] : When the identification is finished, the results (i.e. the species list) are encoded in the unit database Aquabio, verified and validated. The IBGN/IBGA indices and biological quality of the site are established and the sample definitively labelled and stored permanently in the DEMNA collection.

Métadonnées additionnelles

Objet Provide free online access to the main occurrence data following from the monitoring of the biological quality of running waters in Wallonia complying with our legal obligations (‘PSI’ Directive (EU) 2019/1024 and regional decrees about open data including the "Décret conjoint de la Région wallonne et de la Communauté française du 12 juillet 2017 relatif à la réutilisation des informations du secteur public et visant à l’établissement d’une politique de données ouvertes”).
Description de la fréquence de mise à jour The dataset is updated on an annual basis.
Identifiants alternatifs 59b549c0-7da9-4095-98c1-56da90837723
https://ipt.biodiversity.be/resource?r=demna_mi