- Transects for butterflies in Flanders, Belgium
Dernière version Publié par Research Institute for Nature and Forest (INBO) le 11 juin 2021 Research Institute for Nature and Forest (INBO)

The Meetnetten - Transects for butterflies in Flanders, Belgium dataset is a sampling event dataset published by the Research Institute of Nature and Forest (INBO). It is part of the suite of monitoring networks for priority species in Flanders, in which data are collected at fixed locations using a standardized protocol ( This dataset contains transect data for 8 priority butterfly species, as well as other butterflies observed during sampling. Here it is published as a standardized Darwin Core Archive and includes for each sampling event an eventID, date, location and sampling protocol (in the event core), the cloudiness, temperature, and wind force at the time of the event (in the measurement or fact extension) and for each occurrence an occurrenceID, the number of recorded individuals, status (present/absent) and scientific name (in the occurrence extension). Issues with the dataset can be reported at

Generalized and/or withheld information: as these are sensitive priority species, location information is generalized to 1, 5 or 10 km Universal Transverse Mercator (UTM) grid cells. Original locations are available upon request.

We have released this dataset to the public domain under a Creative Commons Zero waiver. We would appreciate it if you follow the INBO norms for data use ( when using the data. If you have any questions regarding this dataset, don't hesitate to contact us via the contact information provided in the metadata or via

For all published datasets, see

Accueil GBIF DwC-A Fichier EML RTF Versions Droits Citer ceci
Enregistrements de données

Les données de cette ressource données d'échantillonnage 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 17 061 enregistrements.

2 tableurs de données d'extension existent également. Un enregistrement d'extension fournit des informations supplémentaires sur un enregistrement du cœur de standard (core). Le nombre d'enregistrements dans chaque tableur de données d'extension est illustré ci-dessous.

  • Event (noyau)
  • MeasurementOrFact 
  • Occurrence 

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.


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 17 061 enregistrements dans Anglais (944 kB) - Fréquence de mise à jour: annuel
Métadonnées sous forme de fichier EML télécharger dans Anglais (23 kB)
Métadonnées sous forme de fichier RTF télécharger dans Anglais (20 kB)

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:

Piesschaert F, Maes D, Brosens D, Westra T, Desmet P, Ledegen H, Veraghtert W, Van de Poel S, Pollet M (2021): - Transects for butterflies in Flanders, Belgium. v1.26. Research Institute for Nature and Forest (INBO). Dataset/Samplingevent.


Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est Research Institute for Nature and Forest (INBO). To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 63938753-1fec-4c08-ae39-e9f8a6576521.  Research Institute for Nature and Forest (INBO) publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du Belgian Biodiversity Platform.


Samplingevent; butterflies; Lepidoptera; monitoring; priority species; Samplingevent


Personne ayant créé cette ressource:

Frederic Piesschaert
Research Institute for Nature and Forest (INBO)
Dirk Maes
Research Institute for Nature and Forest (INBO)
Dimitri Brosens
Research Institute for Nature and Forest (INBO)/ Belgian Biodiversity Platform
Toon Westra
Research Institute for Nature and Forest (INBO)
Peter Desmet
Research Institute for Nature and Forest (INBO)
Sam Van de Poel
Marc Pollet
Research Institute for Nature and Forest (INBO)

Personne pouvant répondre aux questions sur la ressource:

Frederic Piesschaert
Research Institute for Nature and Forest (INBO)

Personne ayant renseigné les métadonnées:

Dimitri Brosens
Research Institute for Nature and Forest (INBO) / Belgian Biodiversity Platform
Peter Desmet
Research Institute for Nature and Forest (INBO)
Couverture géographique

Flanders, Belgium

Enveloppe géographique Sud Ouest [50,67, 2,53], Nord Est [51,51, 5,94]
Couverture taxonomique

The target butterfly species for are listed at Other butterflies observed during the sampling are also included. This dataset covers the transect protocol, for which there are 8 target species.

Kingdom  Animalia (animals)
Phylum  Arthropoda
Class  Insecta (insects)
Order  Lepidoptera (butterflies)
Species  Cyaniris semiargus (mazarine blue / klaverblauwtje),  Erynnis tages (dingy skipper / bruin dikkopje),  Hesperia comma (silver-spotted skipper / kommavlinder),  Hipparchia semele (grayling / heivlinder),  Lasiommata megera (wall brown / argusvlinder),  Melitaea cinxia (glanville fritillary / veldparelmoervlinder),  Pyrgus malvae (grizzled skipper / aardbeivlinder),  Pyronia tithonus (gatekeeper / oranje zandoogje)
Couverture temporelle
Date de début / Date de fin 2016-01-01 / 2020-05-20
Données sur le projet is a suite of monitoring networks through which the Flemish Government is collecting high-quality information on 65 priority plant and animal species. These are species on which Flanders has to report to Europe in the framework of the Habitats and Birds Directives, but also other species that are important for the Flemish nature policy.

Financement Flemish Government
Description du domaine d'étude / de recherche Flanders, Belgium
Description du design Each monitoring network consists of fixed sample locations in which target species are counted based on a standardized protocol. Data collection relies mainly on specialized volunteers, coordinated by the NGO Natuurpunt Studie. Fieldwork is planned and monitored with the web tool, which is also used for entering the collected data.

Les personnes impliquées dans le projet:

Personne de Contact
Frederic Piesschaert
Méthodes d'échantillonnage

Sampling was done using the protocol described in Maes et al. (2019) and explained to volunteers in Ledegen et al. (2018). Cyaniris semiargus (mazarine blue / klaverblauwtje), Erynnis tages (dingy skipper / bruin dikkopje), Hesperia comma (silver-spotted skipper / kommavlinder), Melitaea cinxia (glanville fritillary / veldparelmoervlinder) and Pyrgus malvae (grizzled skipper / aardbeivlinder) occur in less than 30 locations in Flanders. For these species all locations are selected for monitoring and counted annually. Hipparchia semele (grayling / heivlinder), Lasiommata megera (wall brown / argusvlinder) and Pyronia tithonus (gatekeeper / oranje zandoogje) occur in more than 30 locations. For these species a random sample of 30 locations was drawn, which are counted once every three years. Within each selected location, transect counts are carried out. A fixed route of a maximum of 1000m is mapped out, along which the numbers of butterflies per section of 50 m are counted within an imaginary cage of 5 x 5 m around the observer. The sampling protocol may vary a little, depending on the butterfly species. 1. Cyaniris semiargus (mazarine blue / klaverblauwtje): the first generation flies in spring (May), the second generation can be found in high summer (10 July - 10 August). Both seasons are followed up in this monitoring network (at least three field visits per flying season). 2. Erynnis tages (dingy skipper / bruin dikkopje): flies in 2 generations, in spring (May) and in high summer (20 July - 20 August) and is therefore followed up in both seasons (at least six field visits). 3. Hesperia comma (silver-spotted skipper / kommavlinder): we ask at least 3 field visits in good butterfly weather, during the month of August. 4. Hipparchia semele (grayling / heivlinder): in a counting year we ask at least 3 field visits in good butterfly weather, in the period from 20 July to 20 August. 5. Lasiommata megera (wall brown / argusvlinder): in a counting year we ask for 6 field visits in good butterfly weather, 3 in May and 3 in the period from 20 July to 20 August. 6. Melitaea cinxia (glanville fritillary / veldparelmoervlinder): we ask at least 3 field visits in good butterfly weather, between 1 and 31 May. 7. Pyrgus malvae (grizzled skipper / aardbeivlinder): we ask at least 3 field visits in good butterfly weather, during the month of May. 8. Pyronia tithonus (gatekeeper / oranje zandoogje): in a counting year we ask at least 3 field visits in good butterfly weather, in the period from 15 July to 15 August.

Etendue de l'étude 1. Cyaniris semiargus (mazarine blue / klaverblauwtje) was once widespread, but now endangered, with only one known location. It is bound to grasslands with sufficient Trifolium pratense (red clover), its host plant. 2. Erynnis tages (dingy skipper / bruin dikkopje) in Flanders is limited to a handful of locations in Limburg. It prefers (calcareous) grasslands with Lotus corniculatus (common bird's-foot trefoil). 3. Hesperia comma (silver-spotted skipper / kommavlinder) can be found in a limited number of dry heathland areas with well-developed heather-rich vegetation. 4. Hipparchia semele (grayling / heivlinder) is mainly found on dry heathland, heather-rich grasslands and dunes with open sand, sheep grass or ostrich grass. 5. Lasiommata megera (wall brown / argusvlinder) lives in verges and grasslands. Its populations have deteriorated considerably in recent decades. 6. Melitaea cinxia (glanville fritillary / veldparelmoervlinder) can be found in barren grasslands with a sufficient number of Plantago lanceolata (narrow plantain). 7. Pyrgus malvae (grizzled skipper / aardbeivlinder) can be found in only a handful of locations in Flanders. It lives on nutrient-poor grasslands, with Potentilla erecta (tormentil) as host plant. 8. Pyronia tithonus (gatekeeper / oranje zandoogje) is a common species in Flanders that occurs locally in high densities. The distribution of this species is limited to Europe and in Western Europe Pyronia tithonus reaches high densities, but here and there the species declines: therefore this butterfly was selected as a Flemish priority species.
Contrôle qualité Data are collected using a predefined sampling protocol.

Description des étapes de la méthode:

  1. Researchers from INBO and Natuurpunt Studie define and document the appropriate sampling protocol for the target species.
  2. Fieldwork is planned and coordinated by Natuurpunt Studie, using
  3. Data are collected in the field by specialized volunteers, using the predefined sampling protocol.
  4. Volunteers enter the collected data in
  5. A custom SQL view is created in the database to map the original data to Darwin Core as an event core and occurrence extension.
  6. The Darwin Core views are connected to the INBO IPT and documented with metadata.
  7. The dataset is published and registered with GBIF.
Citations bibliographiques
  1. Maes D, Ledegen H, Van de Poel S & Westra T (2019) Monitoringsprotocol Dagvlinders: Versie 2.0. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2019 (56). Instituut voor Natuur- en Bosonderzoek, Brussel.
  2. Ledegen H, Veraghtert W & Van de Poel S (2018) Veldwerkhandleiding dagvlinders. Natuurpunt Studie, Mechelen.
Métadonnées additionnelles
Identifiants alternatifs 63938753-1fec-4c08-ae39-e9f8a6576521