Phytoplankton productivity quantified from chlorophyll fluorescence
Phytoplankton are the main food source for marine life, and accurate uantification of its productivity is essential for understanding how marine food webs function. As a novel non-invasive technology, chlorophyll fluorescence can be used to assess in situ primary production in phytoplankton - overco...
| Main Authors: | , , , , |
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| Format: | Conference Object |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | https://pure.au.dk/portal/en/publications/6db3ba00-9a7f-42ed-8bca-dfde549bf923 http://havforsk2015.geus.dk/index.shtml |
| Summary: | Phytoplankton are the main food source for marine life, and accurate uantification of its productivity is essential for understanding how marine food webs function. As a novel non-invasive technology, chlorophyll fluorescence can be used to assess in situ primary production in phytoplankton - overcoming the limited spatial and temporal resolution of traditional bottle techniques. Here we present data on gross and net primary production from Pulse Amplitude Modulated (PAM) fluorescence, 14C fixation and O2 production of a natural phytoplankton community in the arctic Godthåbsfjorden, in West Greenland. Using a novel combination of PAM fluorescence and biooptical measurements we derived the electron requirement for carbon (C) fixation and oxygen (O2) production in absolute units. Both short- (2h) and long-term (24h) experiments demonstrated a strong coupling between the three techniques, especially during light-limited conditions, resulting in predicable parameters for conversion of PAM fluorescence to gross and net primary production. For instance we documented an electron requirement for gross 14C fixation of 7.7 ± 0.8 (mean ± S.E, with units of mol é (mol C)-1). Future applications using PAM fluorescence on moorings and Autonomous Underwater Vehicles (AUVs) for improved spatial and temporal resolution of primary production will be discussed. |
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