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Meetnetten.be - Transects for dragonflies in Flanders, Belgium

Dataset homepage

Citation

Piesschaert F, De Knijf G, Brosens D, Westra T, Desmet P, Ledegen H, Pollet M (2022). Meetnetten.be - Transects for dragonflies in Flanders, Belgium. Version 1.16. Research Institute for Nature and Forest (INBO). Sampling event dataset https://doi.org/10.15468/y8u6e9 accessed via GBIF.org on 2023-02-01.

Description

Meetnetten.be - Transects for dragonflies 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 transect data for 3 priority dragonfly species, as well as other dragonflies 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 length of the transect (in the measurement or fact extension) and for each occurrence an occurrenceID, the number of recorded individuals, status (present/absent), life stage, sex and scientific name (in the occurrence extension). 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 opendata@inbo.be.

For all published Meetnetten.be datasets, see https://www.gbif.org/dataset/search?project_id=meetnetten.be

Sampling Description

Study Extent

1. Calopteryx virgo (Beautiful Demoiselle / Bosbeekjuffer) occurs near oxygen rich watercourses with good water quality and riverbank that mostly consist of trees and bushes. The males exhibit territorial behaviour over a 5 m stretch of sunlit water/riverbank. In Flanders it is widely distributed in the eastern half of the region. 2. Coenagrion pulchellum (Variable Damselfly / Variabele waterjuffer) occurs mainly in moderately to nutrient-rich pools and ponds characterized by well-developed aquatic and riparian vegetation. Although it is scarcely distributed all over Flanders, it shows a clear preference for the valley of the river Scheldt and its major tributaries. 3. Aeshna isoceles (Green-eyed Hawker / Vroege glazenmaker) occurs in moderately to nutrient-rich pools and ponds. It can also be found in nutrient-rich fens. The riparian vegetation is well developed and reed or bulrush is mostly present. The species has seen a strong increase and expansion in Flanders over the last 10 years and shows a clear preference for the major river valleys and areas with high densities of pools..

Sampling

Sampling was done using the protocol described in De Knijf et al. (2019) and explained to volunteers in Ledegen et al. (2017). 1. Calopteryx virgo (Beautiful demoiselle / Bosbeekjuffer): a sample of 30 populations is monitored, of which 10 are counted each year. In the year a population is counted, at least three transect counts are carried out when flying adults occur (May 20 - Aug 20), with good dragonfly weather, between 11h and 16:30h. A transect is located along the shore and is at least 100m, maximum 500m long (depending on the amount of suitable habitat). During a count, the transect is walked slowly and all adults are counted up to a distance of 2 m on the bank and 3 m above the water. 2. Coenagrion pulchellum (Variable Damselfly / Variabele waterjuffer): a sample of 30 populations is monitored, of which 10 are counted each year. In the year a population is counted, at least two transect counts are carried out when flying adults occur (May-June), in good dragonfly weather, between 11h and 16:30h. A transect is located along the shore and is about 100 m long (depending on the amount of suitable habitat). During a count, the transect is walked slowly and all adults are counted up to a distance of 2 m on the bank and 3 m above the water. 3. Aeshna isoceles (Green-eyed Hawker / Vroege glazenmaker): a sample of 30 populations is monitored, of which 10 are counted each year. In the year a population is counted, at least two transect counts are carried out when flying adults occur (20 May - 30 June), with good dragonfly weather, between 11h and 16:30h. A transect is located along the shore and is about 100 m long (up to a maximum of 500 m depending on the amount of suitable habitat). During a count, the transect is walked slowly and all adults are counted up to a distance of 2 m on the bank and 5 m above the water.

Quality Control

Data are collected using a predefined sampling protocol.

Method steps

  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 https://meetnetten.be.
  3. Data are collected in the field by specialized volunteers, using the predefined sampling protocol.
  4. Volunteers enter the collected data in https://meetnetten.be.
  5. A custom SQL view is created in the meetnetten.be 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.

Additional info

We like to thank the "Libellenvereniging Vlaanderen” (https://www.odonata.be) for their input in creating this dataset.

Taxonomic Coverages

The target dragonfly species for Meetnetten.be are listed at https://meetnetten.be/#group-6. Other dragonflies observed during the sampling are also included. This dataset covers the transect protocol, for which there are 3 target species.
  1. Animalia
    rank: kingdom
  2. Arthropoda
    rank: phylum
  3. Insecta
    rank: class
  4. Odonata
    rank: order
  5. Calopteryx virgo
    common name: Beautiful Demoiselle / Bosbeekjuffer rank: species
  6. Coenagrion pulchellum
    common name: Variable Damselfly / Variabele waterjuffer rank: species
  7. Aeshna isoceles
    common name: Green-eyed Hawker / Vroege glazenmaker rank: species

Geographic Coverages

Flanders, Belgium

Bibliographic Citations

  1. Ledegen H & De Knijf G (2017) Veldwerkhandleiding Libellen. Natuurpunt Studie, Mechelen. -
  2. De Knijf G, Ledegen H & Westra T (2019) Monitoringsprotocol Libellen. Versie – 2.0. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2019 (49). Instituut voor Natuur- en Bosonderzoek, Brussel. - https://doi.org/10.21436/inbor.17262395
  3. De Knijf G, Anselin A, Goffart P & Tailly M (eds.) (2006) De libellen (Odonata) van België: verspreiding - evolutie - habitats. Libellenwerkgroep Gomphus i.s.m. Instituut voor Natuur- en Bosonderzoek, Brussel. -

Contacts

Frederik Piesschaert
originator
position: researcher
Research Institute for Nature and Forest (INBO)
BE
userId: http://orcid.org/0000-0002-5843-646X
Geert De Knijf
originator
position: Researcher
Research Institute for Nature and Forest (INBO)
BE
userId: http://orcid.org/0000-0002-7958-1420
Dimitri Brosens
originator
position: Researcher
Research Institute for Nature and Forest (INBO)/ Belgian Biodiversity Platform
9050
BE
email: dimitri.brosens@inbo.be
userId: http://orcid.org/0000-0002-0846-9116
Toon Westra
originator
position: Researcher
Research Institute for Nature and Forest (INBO)
BE
email: toon.westra@inbo.be
userId: http://orcid.org/0000-0003-2478-9459
Peter Desmet
originator
position: Researcher
Research Institute for Nature and Forest (INBO)
BE
email: peter.desmet@inbo.be
userId: http://orcid.org/0000-0002-8442-8025
Hannes Ledegen
originator
position: Researcher
Natuurpunt
BE
email: hannes.ledegen@natuurpunt.be
homepage: http://www.natuurpunt.be
Marc Pollet
originator
position: Research manager
Research Institute for Nature and Forest (INBO)
BE
email: marc.pollet@inbo.be
userId: http://orcid.org/0000-0001-5198-5928
Dimitri Brosens
metadata author
Research Institute for Nature and Forest (INBO)/ Belgian Biodiversity Platform
BE
email: dimitri.brosens@inbo.be
userId: http://orcid.org/0000-0002-0846-9116
Peter Desmet
metadata author
Research Institute for Nature and Forest (INBO)
userId: http://orcid.org/0000-0002-8442-8025
Frederik Piesschaert
administrative point of contact
position: researcher
Research Institute for Nature and Forest (INBO)
BE
userId: http://orcid.org/0000-0002-5843-646X
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