Nighttime and daytime respiration in a headwater stream
| Autor: | Jan H. Fleckenstein, Eugènia Martí, Marc Peipoch, Ricardo González-Pinzón, Roy Haggerty |
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| Rok vydání: | 2015 |
| Předmět: |
Daytime
010504 meteorology & atmospheric sciences Stream metabolism Resazurin 0208 environmental biotechnology Stream temperature 02 engineering and technology Aquatic Science 01 natural sciences Diel fluctuations Respiration Community respiration Hyporheic zone Diel vertical migration Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes Riparian zone Hydrology geography geography.geographical_feature_category Ecology Smart tracers 020801 environmental engineering Photosynthetically active radiation Environmental science Headwater stream Respiration rate |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 8 páginas,6 figuras, 4 tablas. We investigated changes in respiration across nighttime and daytime in a headwater stream. For this, we conducted consecutive nighttime and daytime experiments injecting the bioreactive tracer resazurin in two reaches with different riparian canopy densities (different levels of photosynthetically active radiation) to compare respiration rate coefficients. We found that even though stream water temperatures measured above the streambed at day and night (half-day timescale) were different within each reach and across reaches (95% confidence level), apparent respiration rate coefficients were not different across nighttime and daytime conditions (95% confidence level). A likely explanation for this is that the bulk of stream respiration takes place in the hyporheic zone, where diel fluctuations of stream temperature and photosynthetically active radiation are considerably attenuated and where temperature is not measured in routine investigations of stream metabolism. Our results suggest that community respiration in headwater streams may not need to be ‘corrected’ for temperature between daytime and nighttime, even though instantaneous changes in respiration are expected to occur from a pure biological perspective. This work was funded by NSF grants EAR 09-38338 and IIA-1301346, and by the Spanish Ministry of Science and Innovation through the ISONEF (ref: CGL2008-05504-C02- 02/BOS) project. |
| Databáze: | OpenAIRE |
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