Seawater carbonate chemistry and microzooplankton abundance

DOI

Aquatic ecosystems face a multitude of environmental stressors, including warming and acidification. While warming is expected to have a pronounced effect on plankton communities, many components of the plankton seem fairly robust towards realistic end-of-century acidification conditions. However, interactions of the two stressors and the inclusion of further factors such as nutrient concentration and trophic interactions are expected to change this outcome. We investigated the effects of warming and high CO2 on a nutrient-deplete late summer plankton community from the Kiel Fjord, Baltic Sea, using a mesocosm setup crossing two temperatures with a gradient of CO2. Phytoplankton and microzooplankton (MZP) growth rates as well as biomass, taxonomic composition, and grazing rates of MZP were analysed. We observed effects of high CO2, warming, and their interactions on all measured parameters. The occurrence and direction of the effects were dependent on the phytoplankton or MZP community composition. In addition, the abundance of small-sized phytoplankton was identified as one of the most important factors in shaping the MZP community composition. Overall, our results indicate that an estuarine MZP community used to strong natural fluctuations in CO2 can still be affected by a moderate increase in CO2 if it occurs in combination with warming and during a nutrient-deplete post-bloom situation. This highlights the importance of including trophic interactions and seasonality aspects when assessing climate change effects on marine zooplankton communities.

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2021-07-28.22.5 °C = warm treatment16.5 °C = cold treatment

Identifier
DOI https://doi.org/10.1594/PANGAEA.934135
Related Identifier https://doi.org/10.1007/s00227-020-03683-0
Related Identifier https://doi.org/10.1594/PANGAEA.901801
Related Identifier https://doi.org/10.1594/PANGAEA.848402
Related Identifier https://doi.org/10.1594/PANGAEA.869487
Related Identifier https://doi.org/10.1594/PANGAEA.932132
Related Identifier https://cran.r-project.org/web/packages/seacarb/index.html
Related Identifier https://doi.org/10.1594/PANGAEA.932165
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.934135
Provenance
Creator Horn, Henriette G; Boersma, Maarten; Garzke, Jessica; Sommer, Ulrich; Aberle, Nicole
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Contributor Paul, Carolin; Yang, Yan
Publication Year 2020
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 2952 data points
Discipline Earth System Research
Temporal Coverage Begin 2013-08-16T00:00:00Z
Temporal Coverage End 2013-09-13T00:00:00Z