In this study we show a link between the respiratory method and state of hydration in an arid dwelling tenebrionid beetle ( Pimelia grandis ). Dehydrated beetles use discontinuous gas exchange cycles with a flutter period consisting of several discrete bursts of CO 2 release, whereas beetles given access to food and water showed a form of continuous CO 2 release. These data give support to the respiratory water conservation hypothesis for the discontinuous gas exchange cycle.
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Duncan et al. (2002) studied this question.
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