Citation:

ppl.12539

Name: Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica
Published: 2017-04-21
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Antarctic; Bottles or small containers/Aquaria (<20 L); Chaetoceros debilis; Chromista; Fragilariopsis kerguelensis; Growth/Morphology; Haptophyta; Laboratory experiment; Ochrophyta; Open ocean; Pelagos; Phaeocystis antarctica; Phytoplankton; Polar; Primary production/Photosynthesis; Single species

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Abstract:

To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons/m2/s) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC per cell was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e.g. C. debilis) or POC content (e.g. F. kerguelensis) under OA in conjunction with high light. For both diatoms, also maximum quantum yields of PSII (Fv/Fm) were decreased under these conditions, indicating lowered photochemical efficiencies. To counteract the negative effects by OA and high light, the two diatoms showed diverging photoacclimation strategies. While cellular chlorophyll a and fucoxanthin contents were enhanced in C. debilis to potentially maximize light absorption, F. kerguelensis exhibited reduced chlorophyll a per cell, increased disconnection of antennae from photosystem II reaction centers and strongly lowered absolute electron transport rates (ETR). The decline in ETRs in F. kerguelensis might be explained in terms of different species-specific strategies for tuning the available flux of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Overall, our results revealed that P. antarctica was more tolerant to OA and changes in irradiance than the two diatoms, which may have important implications for biogeochemical cycling.

Keyword(s):

Antarctic; Bottles or small containers/Aquaria (<20 L); Chaetoceros debilis; Chromista; Fragilariopsis kerguelensis; Growth/Morphology; Haptophyta; Laboratory experiment; Ochrophyta; Open ocean; Pelagos; Phaeocystis antarctica; Phytoplankton; Polar; Primary production/Photosynthesis; Single species

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2017-04-21.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Trimborn, Scarlett		study
2	Species	Species		Trimborn, Scarlett
3	Registration number of species	Reg spec no		Trimborn, Scarlett
4	Uniform resource locator/link to reference	URL ref		Trimborn, Scarlett		WoRMS Aphia ID
5	Treatment	Treat		Trimborn, Scarlett		light level
6	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Trimborn, Scarlett		treatment
7	Growth rate	µ	1/day	Trimborn, Scarlett
8	Growth rate, standard deviation	µ std dev	±	Trimborn, Scarlett
9	Carbon, organic, particulate, per cell	POC/cell	pg/#	Trimborn, Scarlett
10	Carbon, organic, particulate, standard deviation	POC std dev	±	Trimborn, Scarlett
11	Carbon/Nitrogen ratio	C/N		Trimborn, Scarlett
12	Carbon/Nitrogen ratio, standard deviation	C/N std dev	±	Trimborn, Scarlett
13	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Trimborn, Scarlett
14	Maximum photochemical quantum yield of photosystem II, standard deviation	Fv/Fm std dev	±	Trimborn, Scarlett
15	Yield	Yield	%	Trimborn, Scarlett		yield recovery after short-term light stress (% of initial)
16	Yield, standard deviation	Y std dev	±	Trimborn, Scarlett		yield recovery after short-term light stress (% of initial)
17	Irradiance	E	µmol/m²/s	Trimborn, Scarlett
18	Electron transport rate	ETR	µmol e/m²/s	Trimborn, Scarlett
19	Electron transport rate, standard deviation	ETR std dev	±	Trimborn, Scarlett
20	Non photochemical quenching	NPQ		Trimborn, Scarlett
21	Non photochemical quenching, standard deviation	NPQ std dev	±	Trimborn, Scarlett
22	Temperature, water	Temp	°C	Trimborn, Scarlett
23	Salinity	Sal		Trimborn, Scarlett
24	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Trimborn, Scarlett
25	Partial pressure of carbon dioxide, standard deviation	pCO2 std dev	±	Trimborn, Scarlett
26	Carbon dioxide	CO2	µmol/kg	Trimborn, Scarlett
27	Carbon dioxide, standard deviation	CO2 std dev	±	Trimborn, Scarlett
28	Carbon, inorganic, dissolved	DIC	µmol/kg	Trimborn, Scarlett
29	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Trimborn, Scarlett
30	Alkalinity, total	AT	µmol/kg	Trimborn, Scarlett
31	Alkalinity, total, standard deviation	AT std dev	±	Trimborn, Scarlett
32	pH	pH		Trimborn, Scarlett		NBS scale
33	pH, standard deviation	pH std dev	±	Trimborn, Scarlett		NBS scale
34	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
35	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
36	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
37	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)
38	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)
39	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
40	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
41	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
43	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:

7396 data points

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