Relationships between electron transport rates determined by pulse amplitude modulated (PAM) chlorophyll fluorescence and photosynthetic rates by traditional and common methods in natural freshwater phytoplankton

Goto, Nobuo; Miyazaki, Haruna; Nakamura, Nana; Terai, Hitoshi; Ishida, Noriko; Mitamura, Osamu

doi:10.1127/1863-9135/2008/0172-0121

Cited by 14 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under these conditions, FRRF and 14 C‐based measurements of productivity will become de‐coupled. Indeed, a deviation from a linear correlation between ETR RCII and carbon fixation at super‐saturating irradiances has commonly been reported in the literature (Raateoja ; Corno et al ; Kaiblinger and Dokulil ; Fujiki et al ; Goto et al ; Cheah et al ; Hancke et al ; Zhu et al ).…”

Section: Resultsmentioning

confidence: 80%

Primary productivity and the coupling of photosynthetic electron transport and carbon fixation in the Arctic Ocean

Schuback

Hoppe

Tremblay

et al. 2017

Limnology & Oceanography

View full text Add to dashboard Cite

We examined the light absorption properties and light-dependent rates of photosynthetic electron transport (ETR RCII ) and 14 C-uptake in phytoplankton of the Canadian Subarctic and Arctic Ocean. Our results reveal high variability in the light-saturated, chlorophyll a-specific rate of 14 C-uptake (P Chla max ; 0.7 to 8.0 mg C mg chl a 21 h 21 ) , and the light-dependant efficiency of 14 C-uptake (a Chla ; 0.01 to 0.09 mg C mg Chl a 21 h 21 [lmol quanta m 22 s 21 ] 21 ). Variability in P Chla max correlated with light availability in the stratified watercolumn, while both P Chla max and a Chla were correlated to the degree of nitrate depletion in the mixed layer. For all samples, we observed that 14 C-uptake rates reached light saturation at lower irradiances than ETR RCII , leading to significant, light-dependent de-coupling of carbon fixation and photosynthetic electron transport. For samples taken from within the mixed layer, we found that the conversion factor from ETR RCII to carbon fixation was strongly correlated to the magnitude of non-photochemical quenching, as derived from fast repetition rate fluorometry (FRRF) measurements. This correlation supports recent findings from the Subarctic Pacific Ocean, and has the potential to improve FRRF-based estimates of phytoplankton carbon fixation. Our observations reveal distinct environmental regulation of phytoplankton light absorption, electron transport and carbon fixation in phytoplankton assemblages within and below the shallow summer mixed layer, and will help to inform more robust predictions of future primary production in a rapidly changing Arctic Ocean.

show abstract