Sundevall\'s Jirds (A species of gerbil) spend much of the daylight hours in und

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Sundevall's Jirds (A species of gerbil) spend much of the daylight hours in underground burrows, which they often seal off from the ambient air. As the jird respires, the Pco2 in the burrow rises from 0.000003 atm to 0.04 atm. This change in Pco2 doesn't just affect the jird. It also affects parasitic fleas that may present. In a recent study, Downs et al (2015) studied the effect of elevated Pco2 on the survival of fleas. The data are shown in the figure at right. The authors concluded that mortality rate was higher in the high Pco2 treatment because individuals in this group lost excessive amounts of water and CO2 desiccated. How did an elevated Pco2 cause these individuals to desiccate? Explain the process of discontinuous gas exchange in your answer.

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