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A study of the distribution of Acacia trees and bruchid seed beetles in south-western Saudi Arabia revealed that different host-insect pairs occupied a specific range along an altitudinal gradient. Between sea level and 1750 m.a.s.l., the following host-insect pairs were recorded: A. tortilis B. aurivilli; A. tortilis—B. sahelicus; A. ehrenbergiana-B. saudicus; A. asak, A. hamulosa, A. oerfota, and...