Data from: Mapping wing morphs of Tetrix subulata using citizen science data: flightless groundhoppers are more prevalent in grasslands near water

To analyse the correlation between groundhopper wing morph and landscape characteristics, we collected the following data. GBIF observations of Tetrix subulata (Linnaeus, 1758) in the Netherlands were annotated with wing morph and sex (based on the images), and weather and landscape information (based on the location). The weather information is based on an interpolation of data from the Royal Netherlands Meteorological Institute (KNMI). Landscape and habitat information was characterised by determining the area of different area types, from the Basisregistratie Topografie (BRT) TOP10NL dataset, in a radius around the observation. The landscape information also includes Dutch physical-geographical regions. To check for possible effects of seasonality, the event date of the observation is included. To check for the effect of the landscape radius on the analysis, those analyses were repeated for different radiuses. Depending on the precision of the coordinate location, some radiuses could not be tested for some observations. 

The file "data.csv" contains one row per observation-radius combination, with the following columns (* repeated for each radius):

Columns
Description

gbifID*
ID of the observation on GBIF

eventDate*
Date of observation (YYYY-MM-DD)

wing_morph*
Wing morph annotation (long; short)

sex*
Sex annotation (female; male; obscured; multiple; reevaluate i.e. unknown)

region*
Physical-geographical region in which the observation was made

temperature*
Predicted temperature (average over 1991-2020; degrees Celsius)

windspeed*
Predicted windspeed (average over 1991-2020; meters per second)

precipitation*
Predicted precipitation (average over 1991-2020; millimeters)

landscape_radius
Landscape radius (50, 100, 200, 500, or 1000 meters)

deciduous forest, grass, mixed forest, ...
Total surface area of given area type in given radius around observation (square meters)