Distance functions of carabids in crop fields depend on functional traits, crop type and adjacent habitat: a synthesis

Natural pest and weed regulation are essential for agricultural production, but the spatial distribution of natural enemies within crop fields and its drivers are mostly unknown. Using 28 datasets comprising 1,204 study sites across eight Western and Central European countries, we performed a quantitative synthesis of carabid richness, activity densities and functional traits in relation to field edges (i.e. distance functions). We show for the first time that distance functions of carabids strongly depend on carabid functional traits, crop type and, to a lesser extent, adjacent non-crop habitats. Richness of both predators and granivores and activity densities of small and granivorous species decreased towards field interiors, whereas the densities of large species increased. We found strong distance decays in maize and vegetables whereas richness and densities remained more stable in cereals, oilseed crops and legumes. We conclude that carabid assemblages in agricultural landscapes ar..., , , # Distance functions of carabids in crop fields depend on functional traits, crop type and adjacent habitat: a synthesis

Our dataset is a synthesis of 28 studies, comprising 1204 study sites, reporting carabid beetle sampling data as a function of distance from field edge.

## Description of the data and file structure

The data files included are different summaries of the 28 constituent datasets synthesized in this study, each corresponding to one or more modeling workflows (see below). These are saved as .rds file to be imported in R via readRDS().

1. **meta_rich**: plot-level carabid richness by distance
1. *study*: study from which the data come
2. *site*: site identity
3. *richness*: carabid species richness
4. *crop*: crop grown in field from which samples were taken
5. *crop.poo*l: crop pooled into larger categories
6. *snh.type*: type of habitat adjacent to focal field
7. *distance100*: distance from field edge in units of 100 m
8. *...