The invasive psyllid Acizzia uncatoides poses a critical threat to the biodiversity of La Réunion Island by colonizing Acacia heterophylla , a strictly endemic keystone tree. To unravel the drivers of this invasion, we analyzed a five-year time series (2017–2022) of psyllid abundance across an elevational gradient using Seasonal Autoregressive Integrated Moving Average (SARIMA/SARIMAX) modeling. The psyllid population displaye...