Abstract: The relationship between oviposition preference and progeny performance is one of the central themes in evolutionary ecology. To test whether the oviposition selection of mother parasitoids among hosts with different body size is in accordance with the performance of progeny parasitoids in Brachymeria lasus (Hymenoptera: Chalcididae), the host pupae of Pieris rapae (Lepidoptera: Pieridae) were manipulated by starvation at larval stages to obtain host pupae with wide variation in body size.  B. lasus obviously preferred large host pupae, and accordingly, allocated more female offspring. The body size of offspring parasitoids increased linearly with host pupa size, but the development time was un
affected by host pupa size. Our results supported the predictions of ‘host sizequality’ model.

Key words: Land-cover changes, Hydrological response, SWAT model, Suomo Basin