Dutch Centre For Field Ornithology (SOVON) - Bird Atlas 1978-1983 - metadata
Citation
Vergeer J, Marx L (2017). Dutch Centre For Field Ornithology (SOVON) - Bird Atlas 1978-1983 - metadata. Version 1.2. Dutch Centre for Field Ornithology (Sovon). Metadata dataset https://doi.org/10.15468/itzkr1 accessed via GBIF.org on 2024-09-01.Description
The atlas was published in 1987. In the period October 1978 - September 1983 the occurrence of the species was recorded using a grid of 5 x 5 km squares as a geographic unit.The results of this work were combined to form 12 maps per species, one for each month.Sampling Description
Study Extent
The Netherlands, 1978-1983. Thousands of amateur birdwatchers were involved inmapping the distribution of bird species in the Netherlands. The extent of the survey can best be described with the aid of some figures. The total number of observers involved in de survey probably surpassed 5000. They sent in 220000 recordingcards with a total of 5000000 observations of 426 species and subspecies.Sampling
Month after throughout the year for 60 successive months the recorded the occurrence of the species using a grid of 5 x 5 kilometer squares.In establishing the occurrence of bird species in the squares, two categories were distinguished. 1. birds making use of the terrain (code G) and 2. birds flying over the terrain (code F). In many squares, code G was often accompanied by the corresponding numbers observed.Quality Control
District coordinators checked all recording cards before they were processed. Afterwards the observers checked their results and reported missing species or other mistakes to the district coordinators. Based on the results distribution maps made. With the use of this distribution maps further checks on unlikely estimates and mistakes in determination has taken place.Method steps
- 1. Observation of all bird species in the Netherlands in 5x5 km squares. 2. Extensive checks on the accuracy of the information 3. Distrubutions maps of the occurence of 338 species where made
Taxonomic Coverages
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Aviscommon name: Vogels rank: class
Geographic Coverages
The Netherlands
Bibliographic Citations
Contacts
Jan-Willem Vergeeroriginator
Sovon Dutch Centre for Field Ornithology
Toernooiveld 1
Nijmegen
NL - 6525 ED
NL
Telephone: +31247410437
email: jan-willem.vergeer@sovon.nl
Lara Marx
metadata author
email: lara.marx@sovon.nl
Lara Marx
user
email: lara.marx@sovon.nl
Jan-Willem Vergeer
administrative point of contact
Sovon Dutch Centre for Field Ornithology
Toernooiveld 1
Nijmegen
NL - 6525 ED
NL
Telephone: +31247410437
email: jan-willem.vergeer@sovon.nl