Citation:

s00227-013-2199-3

Name: Seawater carbonate chemistry, structural and chemical characteristics of the seagrass Thalassia testudinum in an situ CO2 enrichment experiment
Published: 2013-12-12
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Field experiment; Growth/Morphology; North Atlantic; Plantae; Seagrass; Single species; Temperate; Thalassia testudinum; Tracheophyta

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Abstract:

Seagrasses commonly display carbon-limited photosynthetic rates. Thus, increases in atmospheric pCO2, and consequentially oceanic CO2(aq) concentrations, may prove beneficial. While addressed in mesocosms, these hypotheses have not been tested in the field with manipulative experimentation. This study examines the effects of in situ CO2(aq) enrichment on the structural and chemical characteristics of the tropical seagrass, Thalassia testudinum. CO2(aq) availability was manipulated for 6 months in clear, open-top chambers within a shallow seagrass meadow in the Florida Keys (USA), reproducing forecasts for the year 2100. Structural characteristics (leaf area, leaf growth, shoot mass, and shoot density) were unresponsive to CO2(aq) enrichment. However, leaf nitrogen and phosphorus content declined on average by 11 and 21 %, respectively. Belowground, non-structural carbohydrates increased by 29 %. These results indicate that increased CO2(aq) availability may primarily alter the chemical composition of seagrasses, influencing both the nutrient status and resilience of these systems.

Keyword(s):

Benthos; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Field experiment; Growth/Morphology; North Atlantic; Plantae; Seagrass; Single species; Temperate; Thalassia testudinum; Tracheophyta

Further details:

Lavigne, Héloïse; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Coverage:

Latitude: 24.550000 * Longitude: -81.750000

Date/Time Start: 2009-07-01T00:00:00 * Date/Time End: 2009-12-31T00:00:00

Event(s):

Florida_Keys * Latitude: 24.550000 * Longitude: -81.750000 * Date/Time Start: 2009-07-01T00:00:00 * Date/Time End: 2009-12-31T00:00:00 * 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). The date of carbonate chemistry calculation by seacarb is 2013-12-10.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Identification	ID		Campbell, Justin E
2	Species	Species		Campbell, Justin E
3	Treatment	Treat		Campbell, Justin E
4	Incubation duration	Inc dur	days	Campbell, Justin E
5	Standing crop, vegetation	Stand crop veg	g/m²	Campbell, Justin E
6	Standing crop, vegetation, standard error	Stand crop veg std e	±	Campbell, Justin E
7	Mass per shoot	Mass/shoot	g	Campbell, Justin E
8	Mass per shoot, standard error	Mass/shoot std e	±	Campbell, Justin E
9	Shoot density	Shoot den	#/m²	Campbell, Justin E
10	Shoot density, standard error	Shoot den std e	±	Campbell, Justin E
11	Leaf area per shoot	Leaf A/shoot	cm²	Campbell, Justin E
12	Leaf area per shoot, standard error	Leaf A/shoot std e	±	Campbell, Justin E
13	Leaf, growth rate	Leaf µ	mg/g/day	Campbell, Justin E
14	Leaf, growth rate, standard error	Leaf µ std e	±	Campbell, Justin E
15	Nitrogen/Phosphorus ratio	N/P		Campbell, Justin E		leaf
16	Nitrogen/Phosphorus ratio, standard error	N/P std e	±	Campbell, Justin E		leaf
17	Carbon/Phosphorus ratio	C/P		Campbell, Justin E		leaf
18	Carbon/Phosphorus ratio, standard error	C/P std e	±	Campbell, Justin E		leaf
19	Carbon/Nitrogen ratio	C/N		Campbell, Justin E		leaf
20	Carbon/Nitrogen ratio, standard error	C/N std e	±	Campbell, Justin E		leaf
21	Position	Position		Campbell, Justin E
22	Carbohydrates, non structural	NSC	mg/g	Campbell, Justin E
23	Carbohydrates, non structural, standard error	NSC std e	±	Campbell, Justin E
24	Temperature, water	Temp	°C	Campbell, Justin E	Onset logger
25	Salinity	Sal		Campbell, Justin E
26	Alkalinity, total	AT	µmol/kg	Campbell, Justin E	Potentiometric titration
27	pH	pH		Campbell, Justin E	Potentiometric	NBS scale
28	Carbon, inorganic, dissolved	DIC	µmol/kg	Campbell, Justin E	Calculated using CO2SYS
29	Carbon dioxide	CO2	µmol/kg	Campbell, Justin E	Calculated using CO2SYS
30	Bicarbonate ion	[HCO3]-	µmol/kg	Campbell, Justin E	Calculated using CO2SYS
31	Carbonate ion	[CO3]2-	µmol/kg	Campbell, Justin E	Calculated using CO2SYS
32	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
33	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
34	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
35	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)
36	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)
37	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
38	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
39	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
40	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
41	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:

960 data points

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