Figure 5 from: Maes D, Vanreusel W, Herremans M, Vantieghem P, Brosens D, Gielen K, Beck O, Van Dyck H, Desmet P, Vlinderwerkgroep Natuurpunt (2016) A database on the distribution of butterflies (Lepidoptera) in northern Belgium (Flanders and the Brussels Capital Region). ZooKeys 585: 143-156. https://doi.org/10.3897/zookeys.585.8019

Figure 5 - Number of records (left, increasing dot sizes represent 100, 1000, 2500, 5000 and >5000 records per grid cell) and species (right, increasing dot sizes represent 10, 20, 30, 40 and >40 species per grid cell) in the INBO dataset (1830–2014, top row) and in the NP dataset (1981–2014, bottom row). Squares indicate grid cells without records.