Light history-dependent respiration explains the hysteresis in the daily ecosystem metabolism of seagrass

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• 作者：Matthew P. Adams ; Angus J. P. Ferguson ; Paul S. Maxwell…
• 关键词：Seagrass ; Net ecosystem metabolism ; Oxygen ; Production ; Respiration ; Submerged aquatic vegetation
• 刊名：Hydrobiologia
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：766
• 期：1
• 页码：75-88
• 全文大小：1,552 KB
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• 作者单位：Matthew P. Adams (1)
  Angus J. P. Ferguson (2)
  Paul S. Maxwell (1) (3)
  Brodie A. J. Lawson (4)
  Jimena Samper-Villarreal (5)
  Katherine R. O’Brien (1)
  
  1. School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
  2. NSW Office of Environment and Heritage, 59 Goulburn Street, Sydney, NSW, 2000, Australia
  3. Healthy Waterways, 200 Creek Street, Spring Hill, QLD, 4004, Australia
  4. Mathematical Sciences School, Queensland University of Technology, Brisbane, QLD, 4000, Australia
  5. Marine Spatial Ecology Lab, The University of Queensland, St Lucia, QLD, 4072, Australia
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

Oxygen flux between aquatic ecosystems and the water column is a measure of ecosystem metabolism. However, the oxygen flux varies during the day in a “hysteretic” pattern: there is higher net oxygen production at a given irradiance in the morning than in the afternoon. In this study, we investigated the mechanism responsible for the hysteresis in oxygen flux by measuring the daily pattern of oxygen flux, light, and temperature in a seagrass ecosystem (Zostera muelleri in Swansea Shoals, Australia) at three depths. We hypothesised that the oxygen flux pattern could be due to diel variations in either gross primary production or respiration in response to light history or temperature. Hysteresis in oxygen flux was clearly observed at all three depths. We compared this data to mathematical models, and found that the modification of ecosystem respiration by light history is the best explanation for the hysteresis in oxygen flux. Light history-dependent respiration might be due to diel variations in seagrass respiration or the dependence of bacterial production on dissolved organic carbon exudates. Our results indicate that the daily variation in respiration rate may be as important as the daily changes of photosynthetic characteristics in determining the metabolic status of aquatic ecosystems. Keywords Seagrass Net ecosystem metabolism Oxygen Production Respiration Submerged aquatic vegetation