Processed data of grasshoppers, butterflies and moths for analyses of species trend models for the regional WWF Living Planet Index for Belgium

This archive contains pre-processed datasets used for the analysis of species occupancy models, the results of which were used in the calculation of multi-species indices as part of the regional WWF Living Planet Index for Belgium.

The datasets are csv files (comma separated and . as decimal mark). 

For each species group (moths, butterflies and grasshoppers), the following files are available:

• a species list (files with 'species' in the name)
• an observations list (files with 'observations' in the name - for butterfly or moth species with two distinct flight periods, also a file with the data for the second generation is available)

For one species, Fabriciana adippe, separate files are available with corrected data.

The species list files contain the following variables:

• species_id (unique species id)
• scientific_name (accepted scientific name according to the GBIF taxonomic backbone)
• species_name_NL (Dutch species name)
• species_name_FR (French species name)
• season_start (n-th day of the year that marks the beginning of the first -and possibly only- generation)
• season_end (n-th day of the year that marks the end of the first -and possibly only- generation)

The observations files contain the following variables:

• species_id (a unique identifier)
• year (year of observation)
• month (month of observation)
• day (day of observation)
• julian_day (n-th day of the year)
• site_id (unique identifier for the 1 km x 1km EEA 1 km x 1 km reference grid square https://www.eea.europa.eu/data-and-maps/data/eea-reference-grids-2)
• source (name of data provider)
• count (max number of sightings for the species for that day and site