Fig. 4.

Regression analysis of effects of climate on decadal-scale locust dynamics. (A–C) The effects of previous decade's locust abundance, precipitation (Table 1, σ-unit), and temperature (“temp.Y”, Table 1; σ-unit), respectively, on decadal mean locust abundance. (D) Time series of residuals suggest that reconstructed locust abundance tended to be lower than predicted during the first centuries. (E) Residuals were approximately normally distributed. (F) Autocorrelation function of residuals (ACF) reveals significant positive autocorrelation at lag 3 decades.