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

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如何引用

研究者應依照以下指示引用此資源。:

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.

權利

研究者應尊重以下權利聲明。:

此資料的發布者及權利單位為 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 註冊

此資源已向GBIF註冊，並指定以下之GBIF UUID: 59b549c0-7da9-4095-98c1-56da90837723。  Service Public de Wallonie – Département d’Etude du Milieu Naturel et Agricole (SPW – DEMNA) 發佈此資源，並經由Belgian Biodiversity Platform同意向GBIF註冊成為資料發佈者。

關鍵字

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

聯絡資訊

地理涵蓋範圍

Wallonia, Southern Belgium.

分類群涵蓋範圍

According to T90-350 (2004) French standard, organisms are 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 detailed identification level per taxon is the following:

時間涵蓋範圍

取樣方法

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.

方法步驟描述:

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 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.
5. [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.
6. [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.

額外的詮釋資料