1. The effect of natural variation in abiotic conditions on the herbivory interaction between Prunur mahaleb (Rosaceae) and its monophagous folivore, larvae of Yponomeuta mahalebella (Lepidoptera, Yponomeutidae), was analysed for 2 consecutive years along an elevational gradient in Sierra de Cazorla, south-east Spain. 2. There was a negative correlation between site elevation and mean populatio...

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