Citation:

srep19030

Name: Coralline algal physiology is more adversely affected by elevated temperature than reduced pH
Published: 2016-05-26
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Amphiroa tribulus; Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Laboratory experiment; Lithothamnion sp.; Macroalgae; Neogoniolithon sp.; North Atlantic; Plantae; Primary production/Photosynthesis; Respiration; Rhodophyta; Single species; Temperature; Tropical

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Abstract:

In this study we analyzed the physiological responses of coralline algae to ocean acidification (OA) and global warming, by exposing algal thalli of three species with contrasting photobiology and growth-form to reduced pH and elevated temperature. The analysis aimed to discern between direct and combined effects, while elucidating the role of light and photosynthesis inhibition in this response. We demonstrate the high sensitivity of coralline algae to photodamage under elevated temperature and its severe consequences on thallus photosynthesis and calcification rates. Moderate levels of light-stress, however, were maintained under reduced pH, resulting in no impact on algal photosynthesis, although moderate adverse effects on calcification rates were still observed. Accordingly, our results support the conclusion that global warming is a stronger threat to algal performance than OA, in particular in highly illuminated habitats such as coral reefs. We provide in this study a quantitative physiological model for the estimation of the impact of thermal-stress on coralline carbonate production, useful to foresee the impact of global warming on coralline contribution to reef carbon budgets, reef cementation, coral recruitment and the maintenance of reef biodiversity. This model, however, cannot yet account for the moderate physiological impact of low pH on coralline calcification.

Keyword(s):

Amphiroa tribulus; Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Laboratory experiment; Lithothamnion sp.; Macroalgae; Neogoniolithon sp.; North Atlantic; Plantae; Primary production/Photosynthesis; Respiration; Rhodophyta; Single species; Temperature; Tropical

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: 20.850000 * Longitude: -86.916670

Event(s):

Puerto_Morelos * Latitude: 20.850000 * Longitude: -86.916670 * 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 2016-05-26.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Enríquez, Susana		study
2	Species	Species		Enríquez, Susana
3	Registration number of species	Reg spec no		Enríquez, Susana
4	Uniform resource locator/link to reference	URL ref		Enríquez, Susana		WoRMS Aphia ID
5	Irradiance	E	µmol/m²/s	Enríquez, Susana
6	Gross photosynthesis rate, oxygen	PG O2	µmol/cm²/h	Enríquez, Susana
7	Gross photosynthesis rate, oxygen, standard error	PG O2 std e	±	Enríquez, Susana
8	Calcification rate of calcium carbonate	Calc rate CaCO3	µmol/cm²/h	Enríquez, Susana
9	Temperature, water	Temp	°C	Enríquez, Susana		treatment
10	Respiration rate, oxygen	Resp O2	µmol/cm²/h	Enríquez, Susana		post-illumination
11	Respiration rate, oxygen, standard error	Resp O2 std e	±	Enríquez, Susana		post-illumination
12	Calcification rate of calcium carbonate	Calc rate CaCO3	µmol/cm²/h	Enríquez, Susana		maximum
13	Calcification rate, standard error	Calc rate std e	±	Enríquez, Susana		maximum
14	Gross photosynthesis rate, oxygen	PG O2	µmol/cm²/h	Enríquez, Susana		maximum
15	Gross photosynthesis rate, oxygen, standard error	PG O2 std e	±	Enríquez, Susana		maximum
16	Gross photosynthesis/respiration ratio	PG/resp		Enríquez, Susana
17	Gross photosynthesis/respiration ratio, standard error	PG/resp std e	±	Enríquez, Susana
18	Time in days	Time	days	Enríquez, Susana
19	Irradiance	E	E/m²/day	Enríquez, Susana		light exposure
20	Treatment	Treat		Enríquez, Susana
21	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Enríquez, Susana
22	Maximum photochemical quantum yield of photosystem II, standard error	Fv/Fm std e	±	Enríquez, Susana
23	Respiration rate, oxygen	Resp O2	µmol/cm²/h	Enríquez, Susana		relative post-illumination respiration RL
24	Respiration rate, oxygen, standard error	Resp O2 std e	±	Enríquez, Susana		relative post-illumination respiration RL
25	Gross photosynthesis rate, oxygen	PG O2	µmol/cm²/h	Enríquez, Susana		relative maximum gross photosynthesis
26	Gross photosynthesis rate, oxygen, standard error	PG O2 std e	±	Enríquez, Susana		relative maximum gross photosynthesis
27	Calcification rate of calcium carbonate	Calc rate CaCO3	µmol/cm²/h	Enríquez, Susana		relative maximum calcification rate
28	Calcification rate, standard error	Calc rate std e	±	Enríquez, Susana		relative maximum calcification rate
29	Chlorophyll a	Chl a	µg/cm²	Enríquez, Susana
30	Chlorophyll a, standard error	Chl a std e	±	Enríquez, Susana
31	Antennae pigment	Antennae pigm	mg/m²	Enríquez, Susana
32	Antennae pigment, standard error	Antennae pigm std e	±	Enríquez, Susana
33	Salinity	Sal		Enríquez, Susana
34	Salinity, standard error	Sal std e	±	Enríquez, Susana
35	Temperature, water	Temp	°C	Enríquez, Susana
36	Temperature, water, standard error	T std e	±	Enríquez, Susana
37	pH	pH		Enríquez, Susana		NBS scale
38	pH, standard error	pH std e	±	Enríquez, Susana		NBS scale
39	Alkalinity, total	AT	µmol/kg	Enríquez, Susana
40	Alkalinity, total, standard error	AT std e	±	Enríquez, Susana
41	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Enríquez, Susana	Calculated using CO2SYS
42	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error	pCO2water_SST_wet std e	±	Enríquez, Susana	Calculated using CO2SYS
43	Carbon, inorganic, dissolved	DIC	µmol/kg	Enríquez, Susana	Calculated using CO2SYS
44	Carbon, inorganic, dissolved, standard error	DIC std e	±	Enríquez, Susana	Calculated using CO2SYS
45	Calcite saturation state	Omega Cal		Enríquez, Susana	Calculated using CO2SYS
46	Calcite saturation state, standard error	Omega Cal std e	±	Enríquez, Susana	Calculated using CO2SYS
47	Carbonate ion	[CO3]2-	µmol/kg	Enríquez, Susana	Calculated using CO2SYS
48	Carbonate ion, standard error	[CO3]2- std e	±	Enríquez, Susana	Calculated using CO2SYS
49	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
50	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
51	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
52	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)
53	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)
54	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
55	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
56	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
57	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
58	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:

5675 data points

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