Mesozooplankton community development at elevated CO2


The increasing CO2 concentration in the atmosphere caused by burning fossil fuels leads to increasing pCO2 and decreasing pH in the world ocean. These changes may have severe consequences for marine biota, especially in cold-water ecosystems due to higher solubility of CO2. However, studies on the response of mesozooplankton communities to elevated CO2 are still lacking. In order to test whether abundance and taxonomic composition change with pCO2, we have sampled nine mesocosms, which were deployed in Kongsfjorden, an Arctic fjord at Svalbard, and were adjusted to eight CO2 concentrations, initially ranging from 185 µatm to 1420 µatm. Vertical net hauls were taken weekly over about one month with an Apstein net (55 µm mesh size) in all mesocosms and the surrounding fjord. In addition, sediment trap samples, taken every second day in the mesocosms, were analysed to account for losses due to vertical migration and mortality. The taxonomic analysis revealed that meroplanktonic larvae (Cirripedia, Polychaeta, Bivalvia, Gastropoda, and Decapoda) dominated in the mesocosms while copepods (Calanus spp., Oithona similis, Acartia longiremis and Microsetella norvegica) were found in lower abundances. In the fjord copepods prevailed for most of our study. With time, abundance and taxonomic composition developed similarly in all mesocosms and the pCO2 had no significant effect on the overall community structure. Also, we did not find significant relationships between the pCO2 level and the abundance of single taxa. Changes in heterogeneous communities are, however, difficult to detect, and the exposure to elevated pCO2 was relatively short. We therefore suggest that future mesocosm experiments should be run for longer periods.

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010).Info on data: Data for water column are presented as number of individuals m-3, Data for sediment traps are presented as number of individuals collected in the sediment traps over 48 hrs

Supplement to: Niehoff, Barbara; Schmithüsen, Holger; Knüppel, Nadine; Daase, M; Czerny, Jan; Boxhammer, Tim (2013): Mesozooplankton community development at elevated CO2 concentrations: results from a mesocosm experiment in an Arctic fjord. Biogeosciences, 10(3), 1391-1406

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Creator Niehoff, Barbara ORCID logo; Schmithüsen, Tosia; Knüppel, Nadine; Daase, M ORCID logo; Czerny, Jan; Boxhammer, Tim ORCID logo
Publisher PANGAEA
Contributor Yang, Yan
Publication Year 2013
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 6544 data points
Discipline Earth System Research
Spatial Coverage (11.669 LON, 79.005 LAT); Kongsfjorden, Spitsbergen, Arctic
Temporal Coverage Begin 2010-06-05T00:00:00Z
Temporal Coverage End 2010-07-07T00:00:00Z