Fig. 2

Clustering of mite species based on their ecological features and spatial distributions at the county level. The dendrogram in panel A displays the clusters I‒IV of mite species (Additional file 3: Materials and Methods). The features used for clustering are three quantities associated with each predictor in the BRT models. Two of the three quantities were displayed in A to indicate the possible level of ecological suitability: relative contributions (colors in ascending order from yellow to red) and standardized median value of the predictor (numbers in the heatmap) among counties with mite occurrence (numbers 1‒4 indicate the position of this median in reference to the quartiles of this predictor among all counties). B‒E indicate the spatial distribution of the four clusters (clusters I‒IV). The boundaries of the provinces and seven biogeographic zones are shown as black and red lines, respectively.