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Data on peak caterpillar biomass for 15 years at the HV population. There is a significant negative effect of sunspot numbers (linear term: F1,12 = 7.31, p = 0.019; quadratic term: F1,12 = 5.33, p = 0.039) on biomass. There is no effect of temperature (F1,11 = 1.92, p = 0.19). Both the mean temperature and the number of sunspots were calculated for the period 8 March to 17 May (i.e. the period for which caterpillar phenology correlates best with mean temperature (Visser et al. 2006)).
