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First published online March 16, 2007
Journal of Experimental Biology 210, 1288-1296 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.001982
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Body size-independent safety margins for gas exchange across grasshopper species

Kendra J. Greenlee1, Christina Nebeker2 and Jon F. Harrison2

1 Department of Medicine, Section of Pulmonary and Critical Care Medicine, Baylor College of Medicine, Houston, TX 77030, USA
2 School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA


Figure 1
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  		Fig. 1. (A) Log–log plot of species mean CO2 emission rate MCO2 (µmol h–1) vs species mean body mass (g). (B) Species in the same tribe have symbols of the same color.

 

Figure 2
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  		Fig. 2. CO2 emission rate (MCO2) as a function of atmospheric PO2 for two species of grasshopper. Asterisks mark the Pc for each species.

 

Figure 3
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  		Fig. 3. Species mean Pc vs species mean body mass. Animals of the same subfamily have the same color of symbol (abbreviations as in Fig. 1).

 

Figure 4
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  		Fig. 4. Box plot of Pc for 13 species of grasshopper. Numbers at the bottom of the graph indicate mean body mass (g) for that species. The boundaries of each box mark the 25th percentile and the 75th percentile. The line within each box indicates the median Pc value. Error bars mark the 10th and 90th percentiles. The tree below lists family, subfamily and tribe for each species. Species abbreviations as in Fig. 1.

 

Figure 5
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  		Fig. 5. (A) Species mean ventilation frequency vs body mass in normoxia. Species in the same tribe or genus have the same color of symbol. (B) Ventilation frequency in 21% O2 (filled symbols) and 5% O2 (open symbols) as a function of body mass. Note logarithmic scale of all axes.

 

Figure 6
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  		Fig. 6. (A) Species mean ventilation volume vs body mass in normoxia. Species in the same tribe or genus have the same color of symbol. (B) Ventilation volume in 21% O2 (filled symbols) and 5% O2 (open symbols) as a function of body mass. Note logarithmic scale of all axes.

 

Figure 7
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  		Fig. 7. Mass-specific total tracheal system conductance as a function of body mass across grasshopper species. Regression equation: y=0.72x+1.09, r2=0.85. Species in the same tribe have symbols of the same color (abbreviations as in Fig. 1). Note logarithmic scale of both axes.

 




© The Company of Biologists Ltd 2007