EFFECT OF PHOTOPERIOD ON LONGEVITY AND METABOLIC-RATE IN ANOPHELES-QUADRIMACULATUS

The effect of photoperiod on longevity of nondiapausing members of a s pecies in the mosquito species complex Anopheles quadrimaculatus was t ested in laboratory experiments. First-generation adults reared from 2 field collections showed the same trends: those reared under short ph otoperiod (8 h light: 16 h dark) lived longer than did those reared un der long photoperiod (16 h light: 8 h dark). Adult metabolic rates wer e not consistently related to longevity. In adults reared from the fir st collection, metabolic rates were higher in long-photoperiod individ uals but in adults reared from the second collection, metabolic rates were higher in short-photoperiod individuals. Longevity appears to be another of many insect features that are affected similarly by tempera ture and photoperiod.