RAVON (NL) - Network Ecological Monitoring Reptiles

Ingo Janssen

doi:10.15468/pq3ycj

RAVON (NL) - Network Ecological Monitoring Reptiles

Citation

Janssen I (2018). RAVON (NL) - Network Ecological Monitoring Reptiles. Version 1.11. Reptile, Amphibian and Fish Conservation Netherlands (RAVON). Occurrence dataset https://doi.org/10.15468/pq3ycj accessed via GBIF.org on 2018-10-23.

Description

The Dutch reptile populations are being monitored intensively within the scope of the Dutch Network Ecological Monitoring (NEM). Since 1994 volunteers, coordinated by RAVON (Reptile, Amphibian and Fish Conservation Netherlands), monitor reptiles on an annual base. All seven indigenous species are monitored on transects that are examined seven times a year. The data are used to monitor population trends and patterns and to support legal reporting obligations, scientific research and policy and conservation related issues. Locality data for GBIF are provided on a 5 x 5 km scale.

Sampling Description

Study Extent

Transects are monitored within a two hour timespan. A transect typically consist of only one habitat type.

Sampling

Transects are visited seven times a year under favourable weatherconditions. All encountered reptiles are counted.

Quality Control

The raw data are validated by the coordinator. Statistics Netherlands (CBS) runs an extensive control of the monitor data before calculating trends and indices.

Method steps

Trends and indices are calculated by Statistics Netherlands (CBS) using the TRIM-software package. This dataset summarizes the observations per km2 for each year in an occurrence value per species.

Taxonomic Coverages

All indigenous reptile species in The Netherlands are included in the monitor network.

Anguis fragilis
common name: Slow Worm rank: species
Lacerta agilis
common name: Sand Lizard rank: species
Zootoca vivipara
common name: Viviparous Lizard rank: species
Podarcis muralis
common name: Common Wall Lizard rank: species
Coronella austriaca
common name: Smooth Snake rank: species
Natrix natrix
common name: Grass Snake rank: species
Vipera berus
common name: Adder rank: species

Geographic Coverages

The Netherlands

Bibliographic Citations

Contacts

Ingo Janssen
originator
position: Project Manager
RAVON
Science Park 904
Amsterdam
NL- 1098 XH
Noord-Holland
NL
Telephone: +31205257332
email: i.a.w.janssen@uva.nl
homepage: http://www.ravon.nl/

Ingo Janssen
metadata author
position: project manager
RAVON
Science Park 904
Amsterdam
NL- 1098 XH
Noord-Holland
NL
Telephone: +31205257332
email: i.a.w.janssen@uva.nl
homepage: http://www.ravon.nl/

Marnix de Zeeuw
processor
position: statistical researcher
Statistics Netherlands (CBS)
Henri Faasdreef 312
The Hague
2490 HA
South-Holland
NL
Telephone: +31703374221
email: mp.dezeeuw@cbs.nl
homepage: http://www.cbs.nl/

Ingo Janssen
administrative point of contact
position: project manager
RAVON
Science Park 904
Amsterdam
NL - 1098 XH
Noord-Holland
NL
Telephone: +31205257332
email: i.a.w.janssen@uva.nl
homepage: http://www.ravon.nl/