Occurrences (diagonal) and co-occurrences (off-diagonals) of virus taxa, organized according to the first principal component of the incidence matrix. The numbers inside brackets next to the virus taxon name on the vertical axis indicate the number of single infections. The diagonal elements, indicated with gray color, show the overall number of occurrences of the focal virus. The off-diagonal elements show the numbers of host plants where the two virus taxa co-occur, and the pink color indicates significant correlations between the occurrences of a pair of virus taxa (Pearson’s correlation, p < 0.05).
