Patterns of energy utilization in the tropical dragonfly, Diplacodes trivialis (Rambur), and some other aquatic insects (Anisoptera: Libellulidae)

The dragonfly larva, D. trivialis fed on Anemia salina nauplius was reared in the laboratory from hatching until it emerged as an adult. An average individual weighed 46 mg (wet weight) on the 135th day, when it became adult. Total food intake amounted to 61.5 cal. Feeding rate averaged 140 cal/Kcal insect/day. Assimilation efficiency amounted to 91%. Of the total assimilated food, 48.1% was converted into body substance and 51.9% was used on respiration. Rates of intake, assimilation and conversion of other insects are discussed in relation to D. trivialis.