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Ziveri, Patrizia; D'Amario, Barbara; Pérez-Mejías, Carlos; Grelaud, Michaël; Pitta, Paraskevi; Krasakopoulou, Evangelia; Paraskevi, Pitta (2020): Coccolithophore abundances and CaCO3 concentrations during the 2013 MedSeA mesocosm experiment. PANGAEA, (dataset in review)

Mesocosm experiments have been fundamental to investigate the effects of elevated CO2 and ocean acidification (OA) on planktic communities. However, few of these experiments have been conducted using naturally nutrient-limited waters and/or considering the combined effects of OA and ocean warming (OW). Coccolithophores are a group of calcifying phytoplankton that can reach high abundances in the Mediterranean Sea, and whose responses to OA are modulated by temperature and nutrients. We present the results of the first land-based mesocosm experiment testing the effects of combined OA and OW on an oligotrophic Eastern Mediterranean coccolithophore community. Coccolithophore cell abundance drastically decreased under OW and combined OA and OW (greenhouse, GH) conditions. Emiliania huxleyi calcite mass decreased consistently only in the GH treatment; moreover, anomalous calcifications (i.e. coccolith malformations) were particularly common in the perturbed treatments, especially under OA. Overall, these data suggest that the projected increase in sea surface temperatures, including marine heatwaves, will cause rapid changes in Eastern Mediterranean coccolithophore communities, and that these effects will be exacerbated by OA.
acidification; CaCO3; Coccolithophores; Mediterranean Sea; mesocosm; warming
Supplement to:
D'Amario, Barbara; Pérez-Mejías, Carlos; Grelaud, Michaël; Paraskevi, Pitta; Krasakopoulou, Evangelia; Ziveri, Patrizia (2020): Coccolithophore community response to ocean acidification and warming in the Eastern Mediterranean Sea: results from a mesocosm experiment. Scientific Reports, 10, 12637,
Seventh Framework Programme (FP7), grant/award no. 265103: Mediterranean Sea Acidification in a Changing Climate
Date/Time Start: 2013-09-01T00:00:00 * Date/Time End: 2013-09-12T00:00:00
Coccolithophore_mesocosm_experiment * Method/Device: Mesocosm experiment (MESO)
Experimental treatment (Exp trtm),
C: Control mesocosms (ambient temperature and present day pCO2),
OA: acidified mesocosms (ambient temperature, predicted for year 2100 pCO2) ,
W: heated water mesocosms (temperature: ambient plus 3oC, present day pCO2),
GH: green house mesocosms (temperature: ambient plus 3oC, pCO2: predicted for year 2100), 1,2,3: 3 replicates (Exp trtm)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeZiveri, PatriziaGeocode
2Day of experimentDOEdayParaskevi, Pitta
3TreatmentTreatParaskevi, Pitta
4Experimental treatmentExp treatParaskevi, Pitta
5Calcium carbonate, particulateCaCO3 partµg/lZiveri, Patrizia
6CoccolithophoresCoccolithophores#/lZiveri, PatriziaCountedTotal
7Emiliania huxleyiE. huxleyi#/lZiveri, PatriziaCounted
8Rhabdosphaera clavigeraR. clavigera#/lZiveri, PatriziaCounted
9Syracosphaera spp.Syracosphaera spp.#/lZiveri, PatriziaCounted
10Gephyrocapsa muelleraeG. muellerae#/lZiveri, PatriziaCounted
11Umbellosphaera spp.Umbellosphaera spp.#/lZiveri, PatriziaCounted
12Holococcolithophora spp.Holococcolithophora spp.#/lZiveri, PatriziaCounted
13Emiliania huxleyi, massE. huxleyi mpgZiveri, PatriziaMeasured and/or detected by SYRACO softwareEmiliania huxleyi coccosphere mass
14Emiliania huxleyiE. huxleyi%Ziveri, PatriziaCalculatedMalformed (Percentage with respect to the total number of E. huxleyi coccospheres identified by SEM)
15Rhabdosphaera clavigeraR. clavigera%Ziveri, PatriziaCalculatedMalformed (Percentage with respect to the total number of R. clavigera coccospheres identified by SEM )
16Syracosphaera molischiiS. molischii%Ziveri, PatriziaCalculatedMalformed (Percentage with respect to the total number of S. molischii coccospheres identified by SEM)
17Syracosphaera pulchraS. pulchra%Ziveri, PatriziaCalculatedMalformed (Percentage with respect to the total number of S. pulchra coccospheres identified by SEM)
18Holococcolithophora spp.Holococcolithophora spp.%Ziveri, PatriziaCalculatedMalformed (Percentage with respect to the total number of HOL identified by SEM)
1007 data points

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