Citation:

s00227-017-3136-7

Name: Seawater carbonate chemistry and Posidonia oceanica epiphytic community composition and mineralogy
Published: 2017-09-03
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Coast and continental shelf; Community composition and diversity; Entire community; Field experiment; Mediterranean Sea; Mesocosm or benthocosm; Other studied parameter or process; Soft-bottom community; Temperate

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Abstract:

Alterations in seagrass epiphytic communities are expected under future ocean acidification conditions, yet this hypothesis has been little tested in situ. A Free Ocean Carbon Dioxide Enrichment system was used to lower pH by a ~0.3 unit offset within a partially enclosed portion (1.7 m3) of a Posidonia oceanica meadow (11 m depth) between June 21 and November 3, 2014. Leaf epiphytic community composition (% cover) and bulk epiphytic mineralogy were compared every 4 weeks within three treatments, located in the same meadow: a pH-manipulated (experimental enclosure) and a control enclosure, as well as a nearby ambient area. Percent coverage of invertebrate calcifiers and crustose coralline algae (CCA) did not appear to be affected by the lowered pH. Furthermore, fleshy algae did not proliferate at lowered pH. Only Foraminifera, which covered less than 3% of leaf surfaces, declined in manner consistent with ocean acidification predictions. Bulk epiphytic magnesium carbonate composition was similar between treatments and percentage of magnesium appeared to increase from summer to autumn. CCA did not exhibit any visible skeleton dissolution or mineral alteration at lowered pH and carbonate saturation state. Negative impacts from ocean acidification on P. oceanica epiphytic communities were smaller than expected. Epiphytic calcifiers were possibly protected from the pH treatment due to host plant photosynthesis inside the enclosure where water flow is slowed. The more positive outcome than expected suggests that calcareous members of epiphytic communities may find refuge in some conditions and be resilient to environmentally relevant changes in carbonate chemistry.

Keyword(s):

Benthos; Coast and continental shelf; Community composition and diversity; Entire community; Field experiment; Mediterranean Sea; Mesocosm or benthocosm; Other studied parameter or process; Soft-bottom community; Temperate

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Coverage:

Latitude: 43.678830 * Longitude: 7.323170

Date/Time Start: 2014-04-01T00:00:00 * Date/Time End: 2014-11-30T00:00:00

Event(s):

Villefranche_eFOCE * Latitude: 43.678830 * Longitude: 7.323170 * Date/Time Start: 2014-04-01T00:00:00 * Date/Time End: 2014-11-30T00:00:00 * Method/Device: Experiment (EXP)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2017-08-31.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Cox, T Erin		study
2	Treatment	Treat		Cox, T Erin
3	Time point, descriptive	Time point		Cox, T Erin		Sampling Interval
4	Coverage	Cov	%	Cox, T Erin		CCA
5	Coverage	Cov	%	Cox, T Erin		Bleached CCA
6	Coverage	Cov	%	Cox, T Erin		Biofilm
7	Coverage	Cov	%	Cox, T Erin		Non-calcified algae
8	Coverage	Cov	%	Cox, T Erin		Bryozoans
9	Coverage	Cov	%	Cox, T Erin		Serpulid Polychaetes
10	Coverage	Cov	%	Cox, T Erin		Forams
11	Calcium carbonate mass	CaCO3 mass	mg/cm²	Cox, T Erin
12	Magnesium carbonate, magnesite	MgCO3	%	Cox, T Erin		mol%
13	Asymmetry	Asymmetry		Cox, T Erin		Calcite
14	Aragonite	Arg	%	Cox, T Erin		weight%
15	Temperature, water	Temp	°C	Cox, T Erin
16	Temperature, water, standard deviation	Temp std dev	±	Cox, T Erin
17	Salinity	Sal		Cox, T Erin
18	Salinity, standard deviation	Sal std dev	±	Cox, T Erin
19	Alkalinity, total	AT	µmol/kg	Cox, T Erin
20	pH, total scale	pHT		Cox, T Erin		total scale
21	pH, standard deviation	pH std dev	±	Cox, T Erin
22	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
23	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
24	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
25	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
26	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
27	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
28	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
29	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
30	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

11028 data points

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