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Thoracic Temperature Variations in the Onset of Flight in Dragonflies (Odonata: Anisoptera)

F. Daniel Vogt and Bernd Heinrich
Physiological Zoology
Vol. 56, No. 2 (Apr., 1983), pp. 236-241
Stable URL: http://www.jstor.org/stable/30156055
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Thoracic Temperature Variations in the Onset of Flight in Dragonflies (Odonata: Anisoptera)
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Abstract

Thoracic temperatures ($H_{th}$) of "flier" and "percher" dragonflies were monitored at the onset of flight. Rate of$H_{th}$ warm-up during shivering in fliers was positively correlated with ambient temperature ($H_{a}$) with no clear correlation with body size. In these animals, $H_{th}$ at takeoff ranged from 27 C to 39 C and was positively correlated with body mass. Spontaneous takeoff by perchers in shade was dependent on $H_{a}$ and usually occurred at approximately 7 C above the minimum $H_{th}$ required for flight. Small perchers (100-200 mg) remained perched until $H_{th}$ = 16 C or more, while larger perchers (300-400 mg) did not fly until $H_{th}$ increased to at least 19 C. Perchers flew earlier in the day and had higher $H_{th}$ at takeoff when in sun versus shade. Takeoff by fliers appears to be less dependent on $H_{a}$ than it is for perchers. The data also indicate that these perchers from a temperate climate are able to fly at $H_{th}$'s lower than those reported for perchers from warmer climates.

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