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MEPS 580:83-100 (2017)  -  DOI:

Relationship between light, community composition and the electron requirement for carbon fixation in natural phytoplankton

Yuanli Zhu1,*, Joji Ishizaka1, Sarat Chandra Tripathy2, Shengqiang Wang3, Chiho Sukigara4, Joaquim Goes5, Takeshi Matsuno6, David J. Suggett

1Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan
2ESSO-National Centre for Antarctic and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa 403804, India
3School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, Jiangsu, PR China
4Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
5Lamont-Doherty Earth Observatory at Columbia University, Palisades, New York 10964, USA
6Research Institute for Applied Mechanics, Kyushu University, Fukuoka 812-8581, Japan
7Climate Change Cluster, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
*Corresponding author:

ABSTRACT: Fast repetition rate fluorometry (FRRF) provides a means to examine primary productivity at high resolution across broad scales, but must be coupled with independent knowledge of the electron requirement for carbon uptake (KC) to convert FRRF-measured electron transfer rate (ETR) to an inorganic carbon (C) uptake rate. Previous studies have demonstrated that variability of KC can be explained by key environmental factors (e.g. light, nutrients, temperature). However, how such reconciliation of KC reflects changes of phytoplankton physiological status versus that of community composition has not been well resolved. Therefore, using a dataset of coupled FRRF and C uptake measurements, we examined how the environmental dependency of KC potentially varied with parallel changes in phytoplankton community structure. Data were combined from 14 campaigns conducted during the summer season throughout 2007 to 2014 in the East China Sea (ECS) and Tsushima Strait (TS). KC varied considerably, but this variability was best explained by a linear relationship with light availability (R2 = 0.66). Co-variability between KC and light availability was slightly improved by considering data as 2 clusters of physico-chemical conditions (R2 = 0.74), but was best improved as 2 taxonomic clusters: samples dominated by micro-phytoplankton (>20 µm) versus small phytoplankton (nano + pico, <20 µm; R2 = 0.70-0.81). Interaction of phytoplankton community structure with light availability therefore explains the majority of variance of KC. The algorithms generated through our analysis therefore provide a means to examine C uptake with high resolution from future FRRF observations from these waters.

KEY WORDS: Electron transfer rate · ETR · Primary productivity · Quantum requirement · Carbon fixation · Phytoplankton composition · Fast repetition rate fluorometry

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Cite this article as: Zhu Y, Ishizaka J, Tripathy SC, Wang S and others (2017) Relationship between light, community composition and the electron requirement for carbon fixation in natural phytoplankton. Mar Ecol Prog Ser 580:83-100.

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