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Fig. 8. Simultaneous measurements of CO2 and O2 in a continuously calling S. borellii. Sampling was underway when the cricket began calling. This record shows that continuously calling crickets do not necessarily have constant metabolic rates. Note that O2 records sometimes can spike and drift independently of the more reliable CO2 data (see start and middle of record). Near the end of the record the sampling tube was removed from the burrow and both measures of metabolism fell to essentially zero.





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