Meetnetten.be - Egg counts for butterflies in Flanders, Belgium is a sampling event dataset published by the Research Institute of Nature and Forest (INBO). It is part of the Meetnetten.be suite of monitoring networks for priority species in Flanders, in which data are collected at fixed locations using a standardized protocol (https://meetnetten.be). This dataset contains egg counts for 1 priority butterfly species (Phengaris alcon). 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) 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 Issues with the dataset can be reported at https://github.com/inbo/meetnetten-occurrences/issues
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 (https://www.inbo.be/en/norms-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 email@example.com.
For all published Meetnetten.be datasets, see https://www.gbif.org/dataset/search?project_id=meetnetten.be
The data in this sampling event 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 116 records.
1 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.
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:
Piesschaert F, Maes D, Brosens D, Westra T, Desmet P, Ledegen H, Veraghtert W, Van de Poel S, Pollet M (2023). Meetnetten.be - Egg counts for butterflies in Flanders, Belgium. Version 1.18. Research Institute for Nature and Forest (INBO). Samplingevent dataset. https://doi.org/10.15468/hsfq2u
Researchers should respect the following rights statement:
The publisher and rights holder of this work is 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.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 53b55f0b-eace-46da-b414-351f092e1223. Research Institute for Nature and Forest (INBO) publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Belgian Biodiversity Platform.
Samplingevent; butterflies; Lepidoptera; monitoring; priority species; Samplingevent
|South West [50.67, 2.53], North East [51.51, 5.94]
The target butterfly species for Meetnetten.be are listed at https://meetnetten.be/#group-4. Other butterflies observed during the sampling are also included. This dataset covers the egg count protocol, for which the target species is Phengaris alcon (alcon blue / gentiaanblauwtje).
|Phengaris alcon (alcon blue / gentiaanblauwtje)
|Start Date / End Date
|2016-01-01 / 2022-12-31
Meetnetten.be 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.
|Study Area Description
|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 https://meetnetten.be, which is also used for entering the collected data.
The personnel involved in the project:
Sampling was done using the protocol described in Maes et al. (2019) and explained to volunteers in Ledegen et al. (2018). Egg counts for Alcon blue are done in plots of 10 x 10 m on locations with the highest density of gentians. Counting takes place once a year, in August.
|Phengaris alcon (alcon blue / gentiaanblauwtje) can be found in wet heathlands with Gentiana pneumonanthe (marsh gentian / klokjesgentiaan) and a sufficient number of ants. Not the butterflies, but the eggs of this species are counted on the host plant. Either the entire area is examined and all eggs are mapped or sample areas are used (in the case of large populations).
|Data are collected using a predefined sampling protocol.
Method step description:
- Researchers from INBO and Natuurpunt Studie define and document the appropriate sampling protocol for the target species.
- Fieldwork is planned and coordinated by Natuurpunt Studie, using https://meetnetten.be.
- Data are collected in the field by specialized volunteers, using the predefined sampling protocol.
- Volunteers enter the collected data in https://meetnetten.be.
- A custom SQL view is created in the meetnetten.be database to map the original data to Darwin Core as an event core and occurrence extension.
- The Darwin Core views are connected to the INBO IPT and documented with metadata.
- The dataset is published and registered with GBIF.
- 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. https://doi.org/10.21436/inbor.16744530
- Ledegen H, Veraghtert W & Van de Poel S (2018) Veldwerkhandleiding dagvlinders. Natuurpunt Studie, Mechelen.