Temperature, salinity, CO2, dissolved inorganic nutrients, plankton stoichiometry of indoor mesocosm experiment 2014

Previous studies with Baltic Sea phytoplankton combining elevated seawater temperature with CO2 revealed the importance of size trait-based analyses, in particular dividing the plankton in-to edible (> 5 and < 100 µm) and inedible (< 5 and > 100 µm) size classes for mesozoopankton grazer...

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Bibliographic Details
Main Authors: Paul, Carolin, Sommer, Ulrich, Matthiessen, Birte
Format: Dataset
Language:English
Published: PANGAEA 2021
Subjects:
Ammonium
Baltic Sea
BIOACID
Biological Impacts of Ocean Acidification
Carbon
organic
particulate/Nitrogen
particulate ratio
particulate/Phosphorus
Carbon dioxide
partial pressure
Climate change
CO2
DATE/TIME
Day of experiment
grazing
Kiel_Bight_2014
MESO
Mesocosm experiment
Mesocosm label
Nitrate and Nitrite
Nitrogen
total dissolved
Oxygen
Phytoplankton
Salinity
Silicate
Temperature
water
Treatment: partial pressure of carbon dioxide
Treatment: temperature description
warming
Ocean acidification
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.939014
https://doi.org/10.1594/PANGAEA.939014
Description
Summary:Previous studies with Baltic Sea phytoplankton combining elevated seawater temperature with CO2 revealed the importance of size trait-based analyses, in particular dividing the plankton in-to edible (> 5 and < 100 µm) and inedible (< 5 and > 100 µm) size classes for mesozoopankton grazers. While the edible phytoplankton responded predominantly negative to warming and the inedible group stayed unaffected or increased, independent from edibility most phyto-plankton groups gained from CO2. Because the ratio between edible and inedible taxa changes profoundly over seasons, we investigated, if community responses can be predicted according to the prevailing composition of edible and inedible groups. We experimentally explored the combined effects of elevated temperatures and CO2 concentrations on a late-summer Baltic Sea community. Total phytoplankton significantly increased in response to elevated CO2 in particu-lar in combination with temperature, driven by a significant gain of the inedible < 5 µm fraction and large filamentous cyanobacteria. Large flagellates disappeared. The edible group was low as usual in summer and decreased with both factors due to enhanced copepod grazing and overall decline of small flagellates. Our results emphasize that the responses of summer communities are complex, but can be predicted by the composition and dominance of size classes and groups.

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