Fig. 2

Matrix summarizing the total number of reviews considering each question with respect to ecosystem services. The matrix dimensions are based on the key characteristic outlined with Fig. 1. The matrix can be read using combinations from the left and top headings to form the question of interest, e.g. “What is the number of reviews that were conducted for the temperate region that considered the outcome pollination?”. The diagonals indicate the total number of reviews conducted for the respective category. For further explanation regarding this visualization see [30]