Carbohydrate, Lipid and Protein in the Developmental Stages of Sitophilus oryzae and S. granarius (Coleoptera: Curculionidae)1

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Abstract
Changes in carbohydrate, lipid and protein levels were studied in the developmental stages of Sitophilus oryzae (L.) and S. granarius (L.) reared on whole wheat at 30°C and 70% RH. In S. oryzae life cycle the average values of these nutrients (percentage of dry body weight) ranged between: carbohydrates, 3.9% (adult) and 11.8% (pupa); lipids, 12.7% (adult) and 37.9% (prepupa); and proteins, 50.0% (L4) and 78.3% (adult). In S. granarius life cycle the comparable values ranged between: carbohydrates, 4.5% (adult) and 12.1% (egg); lipids, 15.5% (adult) and 40.2% (prepupa); and proteins, 47.0% (prepupa) and 75.7% (adult). The total amounts of carbohydrates and lipids (mg/individual) increased with biomass growth up to the prepupal stage and then declined in both S. oryzae and S. granarius. The protein contents in S. oryzae increased up to the prepupal stage, declined slightly in pupae and increased again in adults; whereas in S. granarius it constantly increased through the life cycle stages up to adult emergence.