- Chorus counts for Amphibia in Flanders, Belgium

Versão mais recente publicado por Research Institute for Nature and Forest (INBO) em Apr 15, 2021 Research Institute for Nature and Forest (INBO) - Chorus counts for Amphibia 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 site counts for 3 priority species (Hyla arborea, Epidalea calamita and Pelobates fuscus), as well as other amphibian species 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) 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

Registros de Dados

Os dados deste recurso de evento de amostragem foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 147 registros. Também existem 1 tabelas de dados de extensão. Um registro de extensão fornece informações adicionais sobre um registro do núcleo. O número de registros em cada tabela de dados de extensão é ilustrado abaixo.

  • Event (core)
  • Occurrence 

Este IPT armazena os dados e, portanto, serve como um repositório de dados. Os dados e os metadados do recurso estão disponíveis para download no seção de downloads. A tabela de versões lista outras versões do recurso que foram disponibilizadas ao público e permite o rastreamento das alterações realizadas no recurso ao longo do tempo.


Baixe a última versão do recurso de dados, como um Darwin Core Archive (DwC-A) ou recurso de metadados, como EML ou RTF:

Dados como um arquivo DwC-A download 147 registros em English (13 KB) - Frequência de atualização: atualmente
Metadados como um arquivo EML download em English (19 KB)
Metadados como um arquivo RTF download em English (17 KB)


A tabela abaixo mostra apenas versões de recursos que são publicamente acessíveis.

Como citar

Pesquisadores deveriam citar esta obra da seguinte maneira:

Piesschaert F, Speybroeck J, Brosens D, Westra T, Desmet P, Ledegen H, Van de Poel S, Pollet M (2021): - Chorus counts for Amphibia in Flanders, Belgium. v1.14. Research Institute for Nature and Forest (INBO). Dataset/Samplingevent.


Pesquisadores devem respeitar a seguinte declaração de direitos:

O editor e o detentor dos direitos deste trabalho é 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

Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 9bd8310b-0914-411f-a4ba-0cefdd85df80.  Research Institute for Nature and Forest (INBO) publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Belgian Biodiversity Platform.


Samplingevent; Toads; frogs; freshwater; monitoring; priority species; Samplingevent


Quem criou esse recurso:

Frederic Piesschaert
Research Institute for Nature and Forest (INBO) BE
Jeroen Speybroeck
Research Institute for Nature and Forest (INBO) BE
Dimitri Brosens
Research Institute for Nature and Forest (INBO)/ Belgian Biodiversity Platform BE
Toon Westra
Research Institute for Nature and Forest (INBO) BE
Peter Desmet
Research Institute for Nature and Forest (INBO) BE
Hannes Ledegen
Sam Van de Poel
Marc Pollet
Research manager
Research Institute for Nature and Forest (INBO) BE

Quem pode responder a perguntas sobre o recurso:

Frederic Piesschaert
Research Institute for Nature and Forest (INBO) BE

Quem preencher os metadados:

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

Quem mais foi associado com o recurso:

Dimitri Brosens

Cobertura Geográfica

Flanders, Belgium

Coordenadas delimitadoras Sul Oeste [50.67, 2.53], Norte Leste [51.51, 5.94]

Cobertura Taxonômica

The target Caudata species for are listed at Other salamanders observed during the sampling are also included. This dataset covers the amphibian chorus counts protocol, for which there are 3 target species.

Reino  Animalia
Filo  Chordata
Class  Amphibia
Ordem  Caudata,  Anura
Espécie  Hyla arborea,  Epidalea calamita,  Pelobates fuscus

Cobertura Temporal

Data Inicial / Data final 2016-01-01 / 2019-12-31

Dados Sobre o Projeto 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.

Financiamento Flemish Government
Descrição da Área de Estudo Flanders, Belgium
Descrição do 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.

O pessoal envolvido no projeto:

Ponto de Contato
Frederic Piesschaert

Métodos de Amostragem

For the tree frog and spadefoot toad the number of calling males is counted in the reproductive habitat at least twice a year. 1. Male Pelobates fuscus call from the bottom of the waterbody. The calls being fairly weak, counting the exact number of calling males by ear can be challenging. This is particularly the case when other anurans such as Hyla arborea are calling simultaneously. Therefore, the use of an underwater hearing device or hydrophone is advocated. Each waterbody is investigated with waders, in order to approach the calling animals upto hearing distance. 2. Hyla arborea: Monitoring in the framework of the Tree Frog Monitoring Network is done by counting the number of calling males, or in some cases, by estimating the number. 3. For the Natterjack toad monitoring network, calling choruses need to be monitored three times. The number of calling males is counted or in some cases, when the population turns out to be too large, estimated. The number of calling males is counted exactly at each visit. For up to 50 animals the sounds are still good to distinguish and localize so that this is easy (Bauwens & Speybroeck, 2014; Groenveld et al., 2011). With more animals a more rough estimate can be given. Sampling was done using the protocol described in De Bruyn et al. (2015), updated by Speybroeck et al. (2020), and explained to volunteers in Lewylle et al. (2017).

Área de Estudo 1. Pelobates fuscus, or the common spadefoot toad, is found in fishless cattle drinking pools and relatively nutrient-rich ponds, but also in cut brook and river meanders in a fairly open, sandy environment. These are often water features in (buffered) heathlands, but also near dikes and even vegetable gardens and extensively managed fields. This type of habitat is rare in Flanders. The common spadefoot currently only occurs in the central part of Limburg. 2. Hyla arborea, or the common tree frog, is found in the scrubland of the Limburgse Kempen, a restricted section of the Antwerpse Kempen near the Belgian-Dutch border, and the dunes of the Zwin. In recent years, the Flemish population has increased. 3. Epidalea calamita or the Natterjack toad is a true pioneer species that thrives in dynamic environments. The species reproduces from April to August, when the animals gather in breeding pools and the males call loudly.
Controle de Qualidade Data are collected using a predefined sampling protocol.

Descrição dos passos do método:

  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 with an 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.

Citações bibliográficas

  1. Luc De Bruyn, Jeroen Speybroeck, Dirk Maes, Geert De Knijf, Thierry Onkelinx, Frederic Piesschaert, Marc Pollet, Toon Westra & Paul Quataert (2015). Monitoringsprotocol kikkers en padden. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2015 (INBO.R.11336466). Instituut voor Natuur- en Bosonderzoek, Brussel.
  2. Van de Poel S., I. Lewylle, M. Segal & H. Ledegen. 2018. Veldwerkhandleiding Rugstreeppad. Natuurpunt Studie, Mechelen
  3. I. Lewylle, M & H. Ledegen. 2018. Veldwerkhandleiding Boomkikker. Natuurpunt Studie, Mechelen
  4. Speybroeck J, De Bruyn L, Van de Poel S, Ledegen H, Westra T (2020). Monitoringsprotocol amfibieën en reptielen. Versie 2.0. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2020 (22). Instituut voor Natuur- en Bosonderzoek, Brussel.

Metadados Adicionais

Identificadores alternativos 9bd8310b-0914-411f-a4ba-0cefdd85df80