KOSMOS Finland 2012 mesocosm study: primary production and respiration ...

• Main Authors: Spilling, Kristian, Paul, Allanah Joy, Virkkala, Niklas, Hastings, Tom, Lischka, Silke, Stuhr, Annegret, Bermúdez Monsalve, Rafael, Czerny, Jan, Boxhammer, Tim, Schulz, Kai Georg, Ludwig, Andrea, Riebesell, Ulf
• Format: Dataset
• Language: English
• Published: PANGAEA 2016
• Subjects: DATE/TIME; Day of experiment; Mesocosm label; Phase; Primary production, carbon assimilation 24 hr., integrated; Respiration rate, oxygen; Mesocosm experiment; Biological Impacts of Ocean Acidification BIOACID; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.863933; https://doi.pangaea.de/10.1594/PANGAEA.863933

Anthropogenic carbon dioxide (CO2) emissions are reducing the pH in the world's oceans. The plankton community is a key component driving biogeochemical fluxes, and the effect of increased CO2 on plankton is critical for understanding the ramifications of ocean acidification on global carbon fluxes. We determined the plankton community composition and measured primary production, respiration rates and carbon export (defined here as carbon sinking out of a shallow, coastal area) during an ocean acidification experiment. Mesocosms (~ 55 m3) were set up in the Baltic Sea with a gradient of CO2 levels initially ranging from ambient (~ 240 µatm), used as control, to high CO2 (up to ~ 1330 µatm). The phytoplankton community was dominated by dinoflagellates, diatoms, cyanobacteria and chlorophytes, and the zooplankton community by protozoans, heterotrophic dinoflagellates and cladocerans. The plankton community composition was relatively homogenous between treatments. Community respiration rates were lower at high ... : Primary production was determined by measuring incorporation of 14C over 24 h incubation.Respiration was measure as decreasing O2 by an optical O2 sensor over 48 h. ...