Citation:

ngeo100

Name: Seawater carbonate chemistry and encrusting algal communities duirng a mesocosm experiment, 2007
Published: 2007
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Field experiment; Reproduction; Rocky-shore community; Tropical

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Abstract:

Owing to anthropogenic emissions, atmospheric concentrations of carbon dioxide could almost double between 2006 and 2100 according to business-as-usual carbon dioxide emission scenarios. Because the ocean absorbs carbon dioxide from the atmosphere, increasing atmospheric carbon dioxide concentrations will lead to increasing dissolved inorganic carbon and carbon dioxide in surface ocean waters, and hence acidification and lower carbonate saturation states. As a consequence, it has been suggested that marine calcifying organisms, for example corals, coralline algae, molluscs and foraminifera, will have difficulties producing their skeletons and shells at current rates, with potentially severe implications for marine ecosystems, including coral reefs. Here we report a seven-week experiment exploring the effects of ocean acidification on crustose coralline algae, a cosmopolitan group of calcifying algae that is ecologically important in most shallowwater habitats. Six outdoor mesocosms were continuously supplied with sea water from the adjacent reef and manipulated to simulate conditions of either ambient or elevated seawater carbon dioxide concentrations. The recruitment rate and growth of crustose coralline algae were severely inhibited in the elevated carbon dioxide mesocosms. Our findings suggest that ocean acidification due to human activities could cause significant change to benthic community structure in shallow-warm-water carbonate ecosystems.

Keyword(s):

Benthos; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Field experiment; Reproduction; Rocky-shore community; Tropical

Project(s):

European network of excellence for Ocean Ecosystems Analysis (EUR-OCEANS)

European Project on Ocean Acidification (EPOCA)

Funding:

Seventh Framework Programme (FP7), grant/award no. 211384 : European Project on Ocean Acidification

Sixth Framework Programme (FP6), grant/award no. 511106 : European network of excellence for Ocean Ecosystems Analysis

Event(s):

Kuffner_etal_07/T4 * Method/Device: Experiment (EXP)

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).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experimental treatment	Exp treat		Kuffner, Ilsa B
2	Carbonate system computation flag	CSC flag		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
3	Salinity	Sal		Kuffner, Ilsa B	YSI 30 salinty/conductivity/temperature meter
4	Temperature, water	Temp	°C	Kuffner, Ilsa B	YSI 30 salinty/conductivity/temperature meter
5	pH	pH		Kuffner, Ilsa B	Measured	NBS scale
6	pH	pH		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)	Total scale
7	Carbon dioxide	CO2	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
8	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
9	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
10	Bicarbonate ion	[HCO3]-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
11	Carbonate ion	[CO3]2-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
12	Carbon, inorganic, dissolved	DIC	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
13	Alkalinity, total	AT	µmol/kg	Kuffner, Ilsa B	Titration potentiometric
14	Aragonite saturation state	Omega Arg		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
15	Calcite saturation state	Omega Cal		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
16	Crustose coralline algae recruitment	CCAR	#/m²/day	Kuffner, Ilsa B	Measured
17	Crustose coralline algae	CCA	%	Kuffner, Ilsa B	Image analysis
18	Non-calcifying algae	NCA	%	Kuffner, Ilsa B	Image analysis

License:

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

Size:

108 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Exp treat	2 CSC flag (Calculated using seacarb afte...)	3 Sal (YSI 30 salinty/conductivity/t...)	4 Temp [°C] (YSI 30 salinty/conductivity/t...)	5 pH (NBS scale, Measured)	6 pH (Total scale, Calculated using...)	7 CO2 [µmol/kg] (Calculated using seacarb afte...)	8 pCO2water_SST_wet [µatm] (Calculated using seacarb afte...)	9 fCO2water_SST_wet [µatm] (Calculated using seacarb afte...)	10 [HCO3]- [µmol/kg] (Calculated using seacarb afte...)	11 [CO3]2- [µmol/kg] (Calculated using seacarb afte...)	12 DIC [µmol/kg] (Calculated using seacarb afte...)	13 AT [µmol/kg] (Titration potentiometric)	14 Omega Arg (Calculated using seacarb afte...)	15 Omega Cal (Calculated using seacarb afte...)	16 CCAR [#/m²/day] (Measured)	17 CCA [%] (Image analysis)	18 NCA [%] (Image analysis)
Control mesocosm pCO2 treatment 1	24	34.4	23.9	8.13	7.98	12.96	444	442.58	1731.96	171.18	1916.1	2157.3	2.71	4.13	90	14.90	46.6
Control mesocosm pCO2 treatment 2	24	34.3	24.0	8.22	8.07	10.23	351	349.88	1658.47	199.00	1867.7	2153.3	3.16	4.81	102	14.90	25.2
Control mesocosm pCO2 treatment 3	24	34.3	24.0	8.17	8.02	11.83	406	404.71	1704.96	181.82	1898.6	2156.7	2.88	4.39	121	24.40	11.4
Treatment mesocosm pCO2 treatment 1	24	34.3	24.0	7.88	7.73	23.60	810	807.42	1776.91	98.99	1899.5	2025.5	1.57	2.39	20	1.77	48.3
Treatment mesocosm pCO2 treatment 2	24	34.3	23.9	7.92	7.77	21.68	742	739.63	1751.96	104.60	1878.2	2015.0	1.66	2.53	25	1.77	57.3
Treatment mesocosm pCO2 treatment 3	24	34.3	24.0	7.91	7.76	21.68	744	741.63	1745.50	103.99	1871.2	2007.2	1.65	2.51	25	1.00	67.0