![]() ![]() This outcome from our study highlights that the respiratory water cost of gas exchange is similar between species, regardless of gas exchange pattern used, when the confounding factors affecting this cost are controlled. The darkling beetles showed continuous gas exchange pattern only, and their metabolic rate, respiratory water loss and respiratory cost of gas exchange were equivalent to those cockroaches using continuous gas exchange. The speckled cockroaches showed both continuous and discontinuous gas exchange patterns, which had significantly a different metabolic rate and respiratory water loss but the same respiratory water cost of gas exchange. We measured this cost in terms of respiratory water loss relative to metabolic rate (respiratory water cost of gas exchange RWL/V˙CO2) for adults of two insect species, the speckled cockroach (Nauphoeta cinerea) and the darkling beetle (Zophobas morio), which are similar in their mode of gas exchange (dominantly convective), habitat (mesic), body size and measurement conditions, by measuring gas exchange patterns using flow-through respirometry. diffusive), species habitat (aridity), body size and measurement conditions (temperature). It has been suggested to depend on several factors, such as the mode of gas exchange (convective vs. Respiratory water loss during metabolic gas exchange is an unavoidable cost of living for terrestrial insects. ![]()
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