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First published online October 7, 2008
Journal of Experimental Biology 211, 3272-3280 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.022467
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Control of discontinuous gas exchange in Samia cynthia: effects of atmospheric oxygen, carbon dioxide and moisture

John S. Terblanche1,*, Elrike Marais1, Stefan K. Hetz2 and Steven L. Chown1

1 Centre for Invasion Biology, Department of Botany and Zoology, Faculty of Science, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
2 Department of Animal Physiology, Humboldt-Universitat zu Berlin, Philippstrasse 13, 10115 Berlin, Germany


Figure 1
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  		Fig. 1. Schematic diagram of the experimental setup employed during these experiments. Direction of airflow to the gas analyser is indicated by solid arrows. (For further details see Materials and methods.)

 

Figure 2
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  		Fig. 2. A Samia cynthia pupa during the tracheal intubation process. (A) The steel intubation tube is inserted into the spiracle prior to sealing with wax, and (B) just after wax sealing.

 

Figure 3
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  		Fig. 3. Examples of traces of carbon dioxide release (Formula 1CO2, green) and intratracheal pressure (Ptr, red) under experimental conditions in which DGE was maintained. Hyperoxia, wet and dry experiments during control (A,C,E) and treatment (B,D,F) conditions in Samia cynthia. (For full details of conditions during control and treatment periods see Materials and methods.)

 

Figure 4
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  		Fig. 4. Examples of traces of carbon dioxide release (Formula 1CO2, green) and intratracheal pressure (Ptr, red) under experimental conditions in which discontinuous gas exchange (DGE) was not maintained. Hypoxia and hypercapnia experiments during control (A,C) and treatment (B,D) conditions in Samia cynthia. (For full details of conditions during control and treatment periods see Materials and methods.)

 

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© The Company of Biologists Ltd 2008