Consistent temperature dependence of respiration across ecosystems contrasting in thermal history

摘要: Ecosystem respiration is a primary component of the carbon cycle and understanding mechanisms that determine its temperature dependence will be important for predicting how rates efflux might respond to global warming. We used rare model system, comprising network geothermally heated streams ranging in from 5 °C 25 °C, explore nature relationship between temperature. Using this ‘natural experiment’, we tested whether natal thermal regime stream communities influenced absence other potentially confounding variables. An empirical survey 13 across gradient revealed whole-stream was equivalent average activation energy respiratory complex (0.6–0.7 eV). This observation also consistent in-situ benthic respiration. Laboratory experiments, incubating biofilms four at range temperatures, Q10 were remarkably streams, despite marked differences their history significant turnover species composition. Furthermore, absolute standardised unrelated ambient temperature, but strongly reflected biofilm biomass. Together, our results suggest core biochemistry, which drives kinetics oxidative metabolism, may well conserved among diverse taxa environments, intrinsic sensitivity not by environmental