Wingmorph- and Sex-specific Differences in Food Consumption, Fat Accumulation and Fat Consumption in a Cricket Modicogryllus confirmatus

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Food consumption, body weight gain, and total fat content were compared between long-winged (LW) and short-winged (SW) adults of a cricket Modicogryllus confirmatus to understand how different wingmorphs accumulate and use fat reserves after adult emergence. The wingmorph-specific difference in food consumption was confirmed in females : LW females consumed less food than SW females during the first 5 days of adulthood. LW females in which flight muscle histolysis was induced by artificial de-alation (removal of hindwings) at adult emergence (DLW females) consumed more food than intact LW. Unexpectedly, no such difference was obtained in males, and food consumption was much less than in females. Dry body weight was directly related to food consumption, but females were heavier than males after consuming the same amount of food. No significant wingmorph-specific difference was observed in trehalose, glycogen, triglyceride (TG) and total fat contents of the body before feeding. As they fed, LW adults accumulated more fat than SW or DLW adults in females, but fat and TG contents stayed more or less constant in males. SW adults used more TG than LW or DLW adults in both sexes during a 3-day fasting, indicating the presence of morph-specific nutrient utilization or metabolism. These results suggest the importance of information for both sexes to elucidate the physiological costs of the flight capability in wing-dimorphic insects.
1999-03-25