Data for: Correlated biodiversity change between plant and insect assemblages resurveyed after 80 years across a dynamic habitat mosaic

Historical data on co-occurring taxa are extremely rare. As such, the extent to which distinct co-occurring taxa experience similar long-term patterns in species richness and compositional change (e.g., when exposed to a changing environment) is not clear. Using data from a diverse ecological community surveyed in the 1930s and the 2010s, we investigated whether local plant and insect assemblages displayed cross-taxon congruence – i.e., correlated patterns of species richness and compositional change – across six co-occurring taxa: vascular plants, non-vascular plants, grasshoppers and crickets (Orthoptera), ants (Hymenoptera: Formicinae), hoverflies (Diptera: Syrphidae), and dragonflies and damselflies (Odonata). All taxa exhibited high levels of turnover across the ca. 80-year time-period. Despite minimal observed changes at the level of the whole study-system, species richness displayed widespread cross-taxon congruence (i.e., correlated temporal change) across local assemblages with..., ,