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Krause, Evamaria (2014): Experiment: Marine fungi may benefit from ocean acidification. PANGAEA, https://doi.org/10.1594/PANGAEA.831726, Supplement to: Krause, Evamaria; Wichels, Antje; Giménez, Luis; Gerdts, Gunnar (2013): Marine fungi may benefit from ocean acidification. Aquatic Microbial Ecology, 69(1), 59-67, https://doi.org/10.3354/ame01622

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Abstract:
Recent studies have discussed the consequences of ocean acidification for bacterial processes and diversity. However, the decomposition of complex substrates in marine environments, a key part of the flow of energy in ecosystems, is largely mediated by marine fungi. Although marine fungi have frequently been reported to prefer low pH levels, this group has been neglected in ocean acidification research. We present the first investigation of direct pH effects on marine fungal abundance and community structure. In microcosm experiments repeated in 2 consecutive years, we incubated natural North Sea water for 4 wk at in situ seawater pH (8.10 and 8.26), pH 7.82 and pH 7.67. Fungal abundance was determined by colony forming unit (cfu) counts, and fungal community structure was investigated by the culture-independent fingerprint method Fungal Automated Ribosomal Intergenic Spacer Analysis (F-ARISA). Furthermore, pH at the study site was determined over a yearly cycle. Fungal cfu were on average 9 times higher at pH 7.82 and 34 times higher at pH 7.67 compared to in situ seawater pH, and we observed fungal community shifts predominantly at pH 7.67. Currently, surface seawater pH at Helgoland Roads remains >8.0 throughout the year; thus we cannot exclude that fungal responses may differ in regions regularly experiencing lower pH values. However, our results suggest that under realistic levels of ocean acidification, marine fungi will reach greater importance in marine biogeochemical cycles. The rise of this group of organisms will affect a variety of biotic interactions in the sea.
Keyword(s):
Bottles or small containers/Aquaria ( 20 L); Coast and continental shelf; Community composition and diversity; Entire community; Laboratory experiment; North Atlantic; Pelagos; Temperate
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. https://cran.r-project.org/package=seacarb
Coverage:
Date/Time Start: 2011-01-01T00:00:00 * Date/Time End: 2012-01-01T00:00:00
Comment:
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). 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 2014-04-11.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DATE/TIMEDate/TimeGeocode
2Incubation durationInc durweeksKrause, Evamaria
3TreatmentTreatKrause, Evamaria
4Temperature, waterTemp°CKrause, Evamaria
5Bottle numberBottleKrause, Evamaria
6ReplicateReplicateKrause, Evamaria
7Colony forming unitsCFU#Krause, Evamaria
8SalinitySalKrause, Evamaria
9Temperature, waterTemp°CKrause, Evamaria
10pHpHKrause, EvamariaNBS scale
11pH, standard deviationpH std dev±Krause, EvamariaNBS scale
12Alkalinity, totalATµmol/kgKrause, Evamaria
13Alkalinity, total, standard deviationAT std dev±Krause, Evamaria
14Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmKrause, Evamaria
15Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Krause, Evamaria
16Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
17pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
18Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
19Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
21Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
23Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
24Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
8637 data points

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