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6/06/2017 | 10:15 AM - 10:30 AM | Thermal perfomance curves for whole ecosystem metabolism reveal pronounced thermal optima | 302B

Thermal perfomance curves for whole ecosystem metabolism reveal pronounced thermal optima

In the last decade, the influence of temperature on GPP and ER and the response of GPP to variation in light intensity have been formalized in dynamic models describing diel changes in dissolved oxygen (DO) concentration. We used a dynamic model for DO and Markov chain Monte Carlo to estimate parameters prescribing the light response of GPP and the temperature sensitivity of GPP and ER for multiple stream reaches in 3 biomes on a daily basis. We found that thermal optima, the temperatures that maximize DO production (autotrophy) or consumption (heterotrophy), often exist for individual reaches. In temperate streams, optima tend to fall below or at mean daily temperatures, whereas in colder, high-latitude streams, optima occur at or above mean daily temperatures. Optimal temperature, although variable across reaches and biomes, does not vary predictably with temperature sensitivity of GPP and ER. Furthermore, light intensity accentuates the thermal response of individual stream reaches and often increases the optimal temperature. Our results suggest that the temperature that maximizes DO flux is more consistent than other components of thermal response, e.g. Q10 and activation energy.

C10 Biogeochemistry
C32 Primary and Secondary Production
S29 Macrosystem Ecology of Aquatic Systems

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Presenters/Authors

Chao Song (), Michigan State University, chaosong@msu.edu;