Insects represent the largest component of global biodiversity, and widespread declines in their richness and abundance have raised concerns about ecosystem functioning. Yet insect communities in natural and semi-natural grasslands, and the drivers of their recent changes, remain poorly studied at broad spatial scales. In Illinois (USA), efforts to preserve and restore native tallgrass prairies have been ongoing for decades, but their impact on native insect communities remain poorly understood. We conducted a statewide assessment of Auchenorrhyncha communities (Hemiptera, hereafter ‘hoppers’) along a gradient of anthropogenic disturbance. By sampling both plants and hoppers across prairie habitats, we evaluated how management practices and habitat history influence hopper communities through direct and indirect (trophic) pathways. Using community-level analyses and structural equation modeling, we tested hypotheses regarding direct and indirect effects of management intensity, habitat type, and environmental factors on plant and hopper communities. Responses were assessed for prairie-dependent species (e.g., Flexamia grammica and Calamovilfa longifolia), overall species richness (plants and hoppers), and habitat quality indices (Floristic Quality Index, Auchenorrhyncha Quality Index [AQI]). Higher management intensity indirectly promotes hopper species richness through enhanced plant species richness. However, this pattern did not extend to the AQI, which declined significantly under high-intensity management in hill prairies, which currently serve as refuges for the remaining prairie specialist hoppers. These findings suggest that while prairie management benefits plant diversity, its effects on prairie-dependent insect communities are more complex and mediated by ecological and historical factors. Effective conservation of hopper communities may therefore require targeted, habitat-specific management strategies.
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