- Transects for Eresus sandaliatus in Flanders, Belgium

Sampling event
Latest version published by Research Institute for Nature and Forest (INBO) on Jun 26, 2024 Research Institute for Nature and Forest (INBO)

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Description - Transects for Eresus sandaliatus in Flanders, Belgium 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 Eresus sandaliatus, one priority spider species. Here it is published as a standardized Darwin Core Archive and includes for each sampling event an eventID, date, location, locationID and sampling protocol (in the event core) and for each occurrence an occurrenceID, the number of recorded spiderwebs, 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 5x5 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 INBO datasets, see

Data Records

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 49 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.

Event (core)

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, De Knijf G, Van Keer K, Brosens D, Westra T, Desmet P, Van de Poel S, Pollet M (2024). - Transects for Eresus sandaliatus in Flanders, Belgium. Version 1.10. Research Institute for Nature and Forest (INBO). Samplingevent dataset.


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.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 4fca5e06-32b0-406b-a840-e465d3938017.  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; spiders; monitoring; priority species; Flanders


Frederic Piesschaert
  • Originator
  • Point Of Contact
Research Institute for Nature and Forest (INBO)
Geert De Knijf
  • Originator
Research Institute for Nature and Forest (INBO)
Koen Van Keer
  • Originator
Arabel / Natuurpunt
Dimitri Brosens
  • Metadata Provider
  • Originator
Research Institute for Nature and Forest (INBO) Belgian Biodiversity Platform
Toon Westra
  • Originator
Research Institute for Nature and Forest (INBO)
Peter Desmet
  • Metadata Provider
  • Originator
Research Institute for Nature and Forest (INBO)
Sam Van de Poel
Marc Pollet
  • Originator
Research Institute for Nature and Forest (INBO)

Geographic Coverage

Flanders, Belgium

Bounding Coordinates South West [50.67, 2.53], North East [51.51, 5.94]

Taxonomic Coverage

The target species for are listed at This dataset covers the transect protocol, for which there is one (Eresus sandaliatus) target species.

Kingdom Animalia
Phylum Arthropoda
Class Arachnida
Order Aranea
Species Eresus sandaliatus

Temporal Coverage

Start Date / End Date 2016-09-10 / 2023-09-18

Project Data 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.

Funding Flemish Government
Study Area Description Flanders, Belgium
Design 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, which is also used for entering the collected data.

The personnel involved in the project:

Frederic Piesschaert

Sampling Methods

Sampling was done using the protocol described in Van Keer et al. (2020). 1. The Ladybird Spider will be monitored using transects or area counts within delimited areas, where each visible part of the web will be counted. This dataset deals with transect data.

Study Extent To support the Flemish and European nature policy, reliable information is needed on the distribution and trends of Flemish and European priority species. 1. Eresus sandaliatus (Martini & Goeze, 1778). The Ladybird spider builds a dome-shaped web on the ground, which turns into a vertical underground living tube on one side. The spider usually lives in this 5-10 cm deep tube. It often catches large and powerful prey, such as dung beetles and ground beetles.
Quality Control Data are collected using a predefined sampling protocol.

Method step description:

  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, occurrence extension and measurement or fact 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.

Bibliographic Citations

  1. Koen Van Keer, Toon Westra, Sam Van De Poel en Geert De Knijf (2020). Monitoringsprotocol spinnen. Versie 2.0.. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2020. Instituut voor Natuur- en Bosonderzoek, Brussel.

Additional Metadata

We like to thank all the volunteers for their input in creating this dataset.

Alternative Identifiers 4fca5e06-32b0-406b-a840-e465d3938017