Effect of CO2 enrichment on phytoplankton photosynthesis in the North Atlantic sub-tropical gyre.

Tilstone, GH; Sediva, B; Tarran, GA; Kana, R; Prášil, O. 2017 Effect of CO2 enrichment on phytoplankton photosynthesis in the North Atlantic sub-tropical gyre. [in special issue: Atlantic Meridional Transect] Progress in Oceanography, 158. 76-89. https://doi.org/10.1016/j.pocean.2016.12.005.

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Abstract/Summary

The effects of changes in CO2 concentration in seawater on phytoplankton community structure and photosynthesis were studied in the North Atlantic sub-tropical gyre. Three shipboard incubations were conducted for 48 h at ∼760 ppm CO2 and control (360 ppm CO2) from 49°N to 7°N during October and November 2010. Elevated CO2 caused a decrease in pH to ∼7.94 compared to ∼8.27 in the control. During one experiment, the biomass of nano- and picoeukaryotes increased under CO2 enrichment, but primary production decreased relative to the control. In two of the experiments the biomass was dominated by dinoflagellates, and there was a significant increase in the maximum photosynthetic rate (PmB) and light-limited slope of photosynthesis (αB) at CO2 concentrations of 760 ppm relative to the controls. 77 K emission spectroscopy showed that the higher photosynthetic rates measured under CO2 enrichment increased the connection of reversible photosystem antennae, which resulted in an increase in light harvesting efficiency and carbon fixation.

Item Type: Publication - Article
Additional Keywords: CO2 enrichmentPicoeukaryotesDinoflagellatesPhytoplanktonPhotosynthesisEmission spectroscopySub-tropical Atlantic Ocean
Subjects: Biology
Botany
Chemistry
Ecology and Environment
Oceanography
Divisions: Plymouth Marine Laboratory > National Capability categories > Atlantic Meridional Transect
Depositing User: Gavin Tilstone
Date made live: 05 Jan 2018 16:38
Last Modified: 25 Apr 2020 09:58
URI: http://plymsea.ac.uk/id/eprint/7632

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