Phylogenetic signals in pest abundance and distribution range of spider mites

Attributes of pest species like host range are frequently reported as
being evolutionarily constrained and showing phylogenetic signal. Because
these attributes in turn could influence the abundance and impact of
species, phylogenetic information could be useful in predicting the likely
status of pests. In this study, we used regional (China) and global
datasets to investigate phylogenetic patterns in occurrence patterns and
host ranges of spider mites, which constitute a pest group of many
cropping systems worldwide. We found significant phylogenetic signals in
relative abundance and distribution range both at the regional and global
scales. Relative abundance and range size of spider mite were positively
correlated with host range, although these correlations became weaker
after controlling for phylogeny. The results suggest that pest impacts are
evolutionarily constrained. Information that is readily easily obtainable
– including the number of known hosts and phylogenetic position of the
mites – could therefore be useful in predicting future pest risk of
species.