Citation:

meps09892

Name: Experiment: Competition between calcifying and noncalcifying temperate marine macroalgae under elevated CO2 levels
Creator: Laurie C Hofmann
Published: 2012
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Chondrus crispus; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or < 1 m**2); Corallina officinalis; Derbesia marina; Dumontia incrassata; Entire community; Fucus vesiculosus; Growth/Morphology; Laboratory experiment; North Atlantic; Petalonia sp.; Polysiphonia fucoides; Primary production/Photosynthesis; Respiration; Rocky-shore community; Sargassum muticum; Spongomorpha; Temperate; Ulva Compress; Ulva linza

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Abstract:

Since pre-industrial times, uptake of anthropogenic CO2 by surface ocean waters has caused a documented change of 0.1 pH units. Calcifying organisms are sensitive to elevated CO2 concentrations due to their calcium carbonate skeletons. In temperate rocky intertidal environments, calcifying and noncalcifying macroalgae make up diverse benthic photoautotrophic communities. These communities may change as calcifiers and noncalcifiers respond differently to rising CO2 concentrations. In order to test this hypothesis, we conducted an 86 d mesocosm experiment to investigate the physiological and competitive responses of calcifying and noncalcifying temperate marine macroalgae to 385, 665, and 1486 µatm CO2. We focused on comparing 2 abundant red algae in the Northeast Atlantic: Corallina officinalis (calcifying) and Chondrus crispus (noncalcifying). We found an interactive effect of CO2 concentration and exposure time on growth rates of C. officinalis, and total protein and carbohydrate concentrations in both species. Photosynthetic rates did not show a strong response. Calcification in C. officinalis showed a parabolic response, while skeletal inorganic carbon decreased with increasing CO2. Community structure changed, as Chondrus crispus cover increased in all treatments, while C. officinalis cover decreased in both elevated-CO2 treatments. Photochemical parameters of other species are also presented. Our results suggest that CO2 will alter the competitive strengths of calcifying and noncalcifying temperate benthic macroalgae, resulting in different community structures, unless these species are able to adapt at a rate similar to or faster than the current rate of increasing sea-surface CO2 concentrations.

Keyword(s):

Benthos; Chondrus crispus; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or < 1 m**2); Corallina officinalis; Derbesia marina; Dumontia incrassata; Entire community; Fucus vesiculosus; Growth/Morphology; Laboratory experiment; North Atlantic; Petalonia sp.; Polysiphonia fucoides; Primary production/Photosynthesis; Respiration; Rocky-shore community; Sargassum muticum; Spongomorpha; Temperate; Ulva Compress; Ulva linza

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):

Biological Impacts of Ocean Acidification (BIOACID)

Ocean Acidification International Coordination Centre (OA-ICC)

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 2014-02-11.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Species	Species		Hofmann, Laurie C
2	Treatment	Treat		Hofmann, Laurie C
3	Sample ID	Sample ID		Hofmann, Laurie C
4	Incubation duration	Inc dur	days	Hofmann, Laurie C
5	Light saturation	Ek	µmol/m²/s	Hofmann, Laurie C
6	Maximal electron transport rate, relative	rETR max		Hofmann, Laurie C
7	Electron transport rate efficiency	alpha		Hofmann, Laurie C
8	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Hofmann, Laurie C
9	Irradiance	E	µmol/m²/s	Hofmann, Laurie C
10	Yield	Yield	%	Hofmann, Laurie C
11	Electron transport rate, relative	rETR	µmol e/m²/s	Hofmann, Laurie C
12	Group	Group		Hofmann, Laurie C
13	Coverage	Cov	%	Hofmann, Laurie C
14	Simpson index of diversity	Simpson I		Hofmann, Laurie C
15	Shannon Diversity Index	H'		Hofmann, Laurie C
16	Gross oxygen evolution, per chlorophyll a	O2 ev/Chl	µmol/mg/h	Hofmann, Laurie C
17	Growth rate	µ	%/day	Hofmann, Laurie C
18	Carbohydrates, solube, in tissue	CHO sol	mg/g	Hofmann, Laurie C
19	Carbohydrates, insolube, in tissue	CHO insol	mg/g	Hofmann, Laurie C
20	Proteins, in tissue	PTR	mg/g	Hofmann, Laurie C
21	Carbohydrates, total	CHO tot	µg/g	Hofmann, Laurie C
22	Proteins/Carbohydrate ratio	PTR/CHO		Hofmann, Laurie C
23	Carbohydrates, insolube/Carbohydrates, solube ratio	CHO insol/CHO sol		Hofmann, Laurie C
24	Carbohydrates, solube	CHO sol	%	Hofmann, Laurie C
25	Carbohydrates, insolube	CHO insol	%	Hofmann, Laurie C
26	Proteins	Protein	%	Hofmann, Laurie C
27	Phycoerythrin	Phycoe	µg/g	Hofmann, Laurie C
28	Phycocyanin	Phycoc	µg/g	Hofmann, Laurie C
29	Chlorophyll a	Chl a	µg/g	Hofmann, Laurie C
30	Chlorophyll b	Chl b	µg/g	Hofmann, Laurie C
31	Respiration rate, oxygen	Resp O2	µmol/mg/h	Hofmann, Laurie C
32	Respiration rate, oxygen	Resp O2	µmol/mg/h	Hofmann, Laurie C		Light Adapted
33	Salinity	Sal		Hofmann, Laurie C
34	Temperature, water	Temp	°C	Hofmann, Laurie C
35	Alkalinity, total	AT	µmol/kg	Hofmann, Laurie C
36	pH	pH		Hofmann, Laurie C		NBS scale
37	Phosphate	PHSPHT	µmol/kg	Hofmann, Laurie C
38	Silicate	SILCAT	µmol/kg	Hofmann, Laurie C
39	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
40	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
41	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	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)
43	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)
44	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
45	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
46	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
47	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
48	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:

63689 data points

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