1986
The life history of Tetragoneuria cynosura (Say) in Bays Mountain Lake, Tennessee, United States (Anisoptera: Corduliidae)
Publication
Publication
Odonatologica , Volume 15 - Issue 1 p. 81- 90
Data from 8 consecutive years of monthly sweep-net sampling in the littoral zone of Bays Mountain Lake are combined to show the life history of a "typical"generation of T. cynosura at this location (36° CN latitude, 550 m elevation). Population size peaks in mid-July, but declines by 60% before mid-August (mortality attributable to predation by both large dragonflies and sunfish). It then declines gradually through December, more steeply through the winter, and then gradually again until emergence in May. — Size-frequency distributions, and dry mass determinations for certain larvae, suggest that about 50% of the individuals in the penultimate instar in September are semivoltine; the others are fast-growing young-of-the-year entering the penultimate instar at a smaller size than members of the senior year-class. This size differential is maintained when larvae enter the final instar in October, and it appears that the smaller (junior year-class) individuals suffer more mortality during the winter, so that only about 25% of the emerging imagoes are univoltine.
Additional Metadata | |
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Odonatologica | |
CC BY-SA 4.0 NL ("Naamsvermelding-GelijkDelen") | |
Organisation | Societas Internationalis Odonatologica |
D.M. Johnson. (1986). The life history of Tetragoneuria cynosura (Say) in Bays Mountain Lake, Tennessee, United States (Anisoptera: Corduliidae). Odonatologica, 15(1), 81–90. |