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- W2007954489 abstract "Why is maximal insect body size relatively small compared to that of vertebrates? Possibly insect body size is limited by the capacity of the tracheal respiratory system to delivery oxygen down longer and longer tracheae to the tissues. If so, one possible outcome would be that larger insect species would have a smaller safety margin for oxygen delivery (higher critical PO2, Pc). We tested this idea by exposing inactive adult grasshoppers of a range of species and body sizes(0.07–6.4 g) to progressively lower oxygen atmospheres and measuring their ventilation frequency and their ability to maintain metabolic rate(indexed by CO2 emission rate). We analyzed effects of body size on these parameters by simple linear regressions, as well as methods to control for phylogenetic relatedness among species. We found interspecific variation in Pc, but Pc did not significantly correlate with body mass (average Pc across all species =4 kPa). Maximal tracheal system conductance scaled approximately with mass0.7, and estimated ventilation in hypoxia (ventilatory frequency×tidal volume) scaled directly with mass, suggesting that convection is the major mechanism of gas exchange in all these species. These comparative data strengthen the growing body of evidence that body size does not affect the safety margin for oxygen delivery in insects." @default.
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- W2007954489 date "2007-04-01" @default.
- W2007954489 modified "2023-09-27" @default.
- W2007954489 title "Body size-independent safety margins for gas exchange across grasshopper species" @default.
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- W2007954489 doi "https://doi.org/10.1242/jeb.001982" @default.
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