Five-Year Patterns of Emergence in Tetragoneuria cynosura and Gomphus exilis (Odonata)

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Abstract:

Emergence patterns were studied in 2 dragonfly species, Tetragoneuria cynosura (Say) and Gomphus exilis Selys, over a 5-year period in North Carolina. Data were based on systematic collections of exuviae; a total of 4,942 T. cynosura exuviae and 6,499 G. exilis exuviae were obtained. Both forms showed characteristics of “spring species” by emerging early in the year and having a short synchronous emergence period and an early emergence peak. The diurnal emergence peak for T. cynosura occurred earlier in the morning than did that for G. exilis. In both species, males emerged significantly earlier in the emergence period than females; males comprised about 47% of both populations. There is some indication that duration of emergence and the timing of emergence peaks may be temperature-dependent.

Document Type: Research Article

Publication date: November 15, 1973

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  • Annals of the Entomological Society of America is published in January, March, May, July, September, and November. Annals especially invites submission of manuscripts that integrate different areas of insect biology, and address issues that are likely to be of broad relevance to entomologists. Articles also report on basic aspects of the biology of arthropods, divided into categories by subject matter: systematics; ecology and population biology; arthropod biology; arthropods in relation to plant diseases; conservation biology and biodiversity; physiology, biochemistry, and toxicology; morphology, histology, and fine structure; genetics; and behavior.
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