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

Adams, Matthew P., Ferguson, Angus J. P., Maxwell, Paul S., Lawson, Brodie A. J., Samper-Villarreal, Jimena and O'Brien, Katherine R. (2016) Light history-dependent respiration explains the hysteresis in the daily ecosystem metabolism of seagrass. Hydrobiologia, 766 1: 75-88. doi:10.1007/s10750-015-2444-5

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Author Adams, Matthew P.
Ferguson, Angus J. P.
Maxwell, Paul S.
Lawson, Brodie A. J.
Samper-Villarreal, Jimena
O'Brien, Katherine R.
Title Light history-dependent respiration explains the hysteresis in the daily ecosystem metabolism of seagrass
Journal name Hydrobiologia   Check publisher's open access policy
ISSN 0018-8158
Publication date 2016-02
Year available 2015
Sub-type Article (original research)
DOI 10.1007/s10750-015-2444-5
Open Access Status Not Open Access
Volume 766
Issue 1
Start page 75
End page 88
Total pages 14
Place of publication Dordrecht, The Netherlands
Publisher Springer
Collection year 2016
Language eng
Formatted abstract
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.
Keyword Seagrass
Net ecosystem metabolism
Submerged Aquatic Vegetation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
School of Biological Sciences Publications
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Created: Mon, 31 Aug 2015, 09:53:58 EST by Matthew Adams on behalf of School of Chemical Engineering