Citation:

1365-2745.12477

Name: Effects of ocean acidification on Posidonia oceanica epiphytic community and shoot productivity
Published: 2015
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Coast and continental shelf; Community composition and diversity; Laboratory experiment; Macroalgae; Mediterranean Sea; Plantae; Posidonia oceanica; Primary production/Photosynthesis; Respiration; Single species; Temperate; Tracheophyta

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Abstract:

1. Biological interactions can alter predictions that are based on single-species physiological response. It is known that leaf segments of the seagrass Posidonia oceanica will increase photosynthesis with lowered pH, but it is not clear whether the outcome will be altered when the whole plant and its epiphyte community, with different respiratory and photosynthetic demands, are included. In addition, the effects on the Posidonia epiphyte community have rarely been tested under controlled conditions, at near-future pH levels.

2. In order to better evaluate the effects of pH levels as projected for the upcoming decades on seagrass meadows, shoots of P. oceanica with their associated epiphytes were exposed in the laboratory to three pH levels (ambient: 8.1, 7.7 and 7.3, on the total scale) for 4 weeks. Net productivity, respiration, net calcification and leaf fluorescence were measured on several occasions. At the end of the study, epiphyte community abundance and composition, calcareous mass and crustose coralline algae growth were determined. Finally, photosynthesis vs. irradiance curves (PE) was produced from segments of secondary leaves cleaned of epiphytes and pigments extracted.

3. Posidonia leaf fluorescence and chlorophyll concentrations did not differ between pH treatments. Net productivity of entire shoots and epiphyte-free secondary leaves increased significantly at the lowest pH level yet limited or no stimulation in productivity was observed at the intermediate pH treatment. Under both pH treatments, significant decreases in epiphytic cover were observed, mostly due to the reduction of crustose coralline algae. The loss of the dominant epiphyte producer yet similar photosynthetic response for epiphyte-free secondary leaves and shoots suggests a minimal contribution of epiphytes to shoot productivity under experimental conditions.

4. Synthesis. Observed responses indicate that under future ocean acidification conditions foreseen in the next century an increase in Posidonia productivity is not likely despite the partial loss of epiphytic coralline algae which are competitors for light. A decline in epiphytic cover could, however, reduce the feeding capacity of the meadow for invertebrates. In situ long-term experiments that consider both acidification and warming scenarios are needed to improve ecosystem-level predictions.

Keyword(s):

Benthos; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Coast and continental shelf; Community composition and diversity; Laboratory experiment; Macroalgae; Mediterranean Sea; Plantae; Posidonia oceanica; Primary production/Photosynthesis; Respiration; Single species; Temperate; Tracheophyta

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.8. 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: 2014-03-01T00:00:00 * Date/Time End: 2014-03-01T00:00:00

Event(s):

Villefranche_OA * Latitude: 43.678830 * Longitude: 7.323170 * Date/Time: 2014-03-01T00:00:00 * Method/Device: Experiment (EXP)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 is 2016-04-14.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Cox, T Erin		study
2	Species	Species		Cox, T Erin
3	Registration number of species	Reg spec no		Cox, T Erin
4	Uniform resource locator/link to reference	URL ref		Cox, T Erin		WoRMS Aphia ID
5	Treatment	Treat		Cox, T Erin
6	Time point, descriptive	Time point		Cox, T Erin
7	Photosynthetic quantum efficiency	alpha		Cox, T Erin
8	Photosynthetic quantum efficiency, standard error	alpha std e	±	Cox, T Erin
9	Maximal electron transport rate, relative	rETR max		Cox, T Erin
10	Maximal electron transport rate, relative, standard error	rETR max std e	±	Cox, T Erin
11	Saturation light intensity	Ek	µmol photons/m²/s	Cox, T Erin
12	Saturation light intensity, standard error	Ek std e	±	Cox, T Erin
13	Effective quantum yield	Y		Cox, T Erin
14	Effective quantum yield, standard error	Y std e	±	Cox, T Erin
15	Irradiance	E	µmol/m²/s	Cox, T Erin
16	Electron transport rate, relative	rETR	µmol e/m²/s	Cox, T Erin
17	Electron transport rate, relative, standard error	rETR std e	±	Cox, T Erin
18	Net primary production of oxygen	NPP O2	µmol/g/min	Cox, T Erin		per dry weight
19	Net primary production of oxygen, standard error	NPP O2 std e	±	Cox, T Erin		per dry weight
20	Respiration rate, oxygen	Resp O2	µmol/g/min	Cox, T Erin		per dry weight
21	Respiration rate, oxygen, standard error	Resp O2 std e	±	Cox, T Erin		per dry weight
22	Net calcification rate of calcium carbonate	NC CaCO3	µmol/g/h	Cox, T Erin		per dry weight
23	Net calcification rate of calcium carbonate, standard error	NC CaCO3 std e	±	Cox, T Erin		per dry weight
24	Photosynthetic quantum efficiency	alpha		Cox, T Erin		for leaves, cleaned of epiphytes
25	Photosynthetic quantum efficiency, standard error	alpha std e	±	Cox, T Erin		for leaves, cleaned of epiphytes
26	Light saturation point	Ik	µmol/m²/s	Cox, T Erin		for leaves, cleaned of epiphytes
27	Light saturation point, standard error	Ik std e	±	Cox, T Erin		for leaves, cleaned of epiphytes
28	Maximum potential capacity of photosynthesis, oxygen	Pmax O2	µmol/g/min	Cox, T Erin		for leaves, cleaned of epiphytes
29	Maximum potential capacity of photosynthesis, oxygen , standard error	Pmax O2 std e	±	Cox, T Erin		for leaves, cleaned of epiphytes
30	Net primary production of oxygen	NPP O2	µmol/g/min	Cox, T Erin		for leaves, cleaned of epiphytes
31	Respiration rate, oxygen, standard error	Resp O2 std e	±	Cox, T Erin		for leaves, cleaned of epiphytes
32	Irradiance	E	µmol/m²/s	Cox, T Erin		irradiance at which photosynthesis equals respiration
33	Irradiance, standard error	E std e	±	Cox, T Erin		irradiance at which photosynthesis equals respiration
34	Leaf net production, oxygen	Leaf np O2	µmol/g/min	Cox, T Erin		for leaves, cleaned of epiphytes
35	Leaf net production, oxygen, standard error	Leaf np O2 std e	±	Cox, T Erin		for leaves, cleaned of epiphytes
36	Replicates	Repl	#	Cox, T Erin
37	Group	Group		Cox, T Erin
38	Coverage	Cov	%	Cox, T Erin		epiphytes
39	Ratio	Ratio		Cox, T Erin		pixel
40	Taxon/taxa	Taxa		Cox, T Erin
41	Group	Group		Cox, T Erin		zoological
42	Description	Description		Cox, T Erin
43	Counts	Counts	#	Cox, T Erin		number of organisms
44	Counts, standard deviation	Counts std dev	±	Cox, T Erin		number of organisms
45	Salinity	Sal		Cox, T Erin
46	Temperature, water	Temp	°C	Cox, T Erin
47	Temperature, water, standard deviation	Temp std dev	±	Cox, T Erin
48	Alkalinity, total	AT	µmol/kg	Cox, T Erin	Potentiometric titration
49	Alkalinity, total, standard deviation	AT std dev	±	Cox, T Erin	Potentiometric titration
50	pH	pH		Cox, T Erin	Potentiometric	total scale
51	pH, standard deviation	pH std dev	±	Cox, T Erin	Potentiometric	total scale
52	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Cox, T Erin	Infrared gas analyzer
53	Partial pressure of carbon dioxide, standard deviation	pCO2 std dev	±	Cox, T Erin	Infrared gas analyzer
54	Carbon, inorganic, dissolved	DIC	µmol/kg	Cox, T Erin	Calculated using seacarb
55	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Cox, T Erin	Calculated using seacarb
56	Aragonite saturation state	Omega Arg		Cox, T Erin	Calculated using seacarb
57	Aragonite saturation state, standard deviation	Omega Arg std dev	±	Cox, T Erin	Calculated using seacarb
58	Calcite saturation state	Omega Cal		Cox, T Erin	Calculated using seacarb
59	Calcite saturation state, standard deviation	Omega Cal std dev	±	Cox, T Erin	Calculated using seacarb
60	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
61	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
62	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
63	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)
64	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)
65	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
66	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
67	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
68	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:

13278 data points

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