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Synchronous Crepuscular Flight of Female Asian Gypsy Moths: Relationships of Light Intensity and Ambient and Body TemperaturesAuthor(s): Ralph E. Charlton; Ring T. Carde; William E. Wallner; William E. Wallner
Source: Journal of Insect Behavoir. 12(4): 517-531.
Publication Series: Miscellaneous Publication
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DescriptionFemale gypsy moths (Lymantria dispar) of Asian heritage studied in central Siberia and Germany exhibit a highly synchronous flight at dusk, after light intensity falls to about 2 lux. This critical light intensity sets the timing of flight behaviors independent of ambient temperature. Flight follows several minutes of preflight wing fanning during which females in Germany and those from a laboratory colony (derived from Siberian stock) raised their thoracic temperatures to 32-33?C at ambient temperatures of 19-22?C. Thoracic temperature of females in free flight exceeded the air temperature (19-22?C) by approximately 11-13?C. The duration of wing fanning was strongly dependent on ambient temperature. In Germany, where ambient temperatures at dusk ranged between 21 and 25?C, females wing fanned for only 2.1 +/- 0.2 (SE) min; in the much colder temperatures prevalent at dusk in Bellyk, central Siberia (11-13"C), females spent 11.2 +/- 0.6 min in preflight wing fanning. The majority (+/<80%) of mated and even virgin females initiated flight during the evening of the day they eclosed. However, in Bellyk, a small proportion (12%) of females wing fanned for an extended time but then stopped, whereas others (8%) never wing fanned and, therefore, did not take flight. Females also were capable of flight when disturbed during the daylight hours in Germany where the maximal temperature was high (27-30?C), but not in Siberia, where temperatures peaked at only 17-19?C. However, Siberian females were able to propel themselves off the tree on which they were perched by executing several vigorous wing flicks when approached by the predaceous tettigoniid, Tettigonia caudata.
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CitationCharlton, Ralph E.; Carde, Ring T.; Wallner, William E. 1999. Synchronous Crepuscular Flight of Female Asian Gypsy Moths: Relationships of Light Intensity and Ambient and Body Temperatures. Journal of Insect Behavoir. 12(4): 517-531.
Keywordscrepuscular flight: migratory flight: temperature effects, light intensity: body temperature, wing loading
- Female Flight Propensity and Capability in Lymantria dispar (Lepidoptera: Lymantriidae) from Russia, North America, and Their Reciprocal F1 Hybrids
- Evaluation of the effects of light entensity and time interval after the start of scotophase on the female flight propensity of Asian gypsy moth (Lepidoptera: Erebidae)
- World distribution of female flight and genetic variation in Lymantria dispar (Lepidoptera: Lymantriidae)
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