Citation:

bg-2019-97

Name: Acidification and irradiance effect on the photo-physiological fitness, growth and carbon production of the Antarctic cryptophyte Geminigera cryophila
Creator: Scarlett Trimborn
Published: 2019-07-17
License: https://creativecommons.org/licenses/by/4.0/
Keywords: cryptophytes; irradiance; Ocean acidification; Southern Ocean

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Abstract:

Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. This is the first study that investigates the combined effects of the increasing availability of pCO2 (400 and 1000 μatm) and irradiance (20, 200 and 500 μmol photons m-2 s-1) on growth, elemental composition and photo-physiology of the Antarctic cryptophyte Geminigera cryophila. Under ambient pCO2, this species was characterized by a pronounced sensitivity to increasing irradiance with complete growth inhibition at the highest light intensity. Interestingly, when grown under high pCO2 this negative light effect vanished, and it reached the highest rates of growth and particulate organic carbon production at the highest irradiance compared to the other tested experimental conditions. Our results for G. cryophila reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis. Hence, cryptophytes such as G. cryophila may be potential winners of climate change, potentially thriving better in more stratified and acidic coastal waters and contributing in higher abundance to future phytoplankton assemblages of coastal Antarctic waters.

Keyword(s):

cryptophytes; irradiance; Ocean acidification; Southern Ocean

Comment:

#999: not grown

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Type	Type		Trimborn, Scarlett
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: light intensity	T:Io	µmol/m²/s	Trimborn, Scarlett	Irradiance
6	Treatment: partial pressure of carbon dioxide	T:pCO2	µatm	Trimborn, Scarlett	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)
7	Phytoplankton growth rate	Phytopl 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	pg C/cell
11	Carbon, organic, particulate, production per cell	POC prod/cell	pg/#/day	Trimborn, Scarlett
12	Particulate organic carbon, production, standard deviation	POC prod std dev	±	Trimborn, Scarlett	pg C/cell/day
13	Nitrogen, organic, particulate, per cell	PON/cell	pg/#	Trimborn, Scarlett
14	Nitrogen, organic, particulate, per cell, standard deviation	PON/cell std dev	±	Trimborn, Scarlett
15	Production of particulate organic nitrogen	PON prod	pg/#/day	Trimborn, Scarlett
16	Particulate organic nitrogen production, standard deviation	PON prod std dev	±	Trimborn, Scarlett	pg N/cell/day
17	Carbon/Nitrogen ratio	C/N	mol/mol	Trimborn, Scarlett
18	Carbon/Nitrogen ratio, standard deviation	C/N std dev	±	Trimborn, Scarlett
19	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Trimborn, Scarlett
20	Maximum photochemical quantum yield of photosystem II, standard deviation	Fv/Fm std dev	±	Trimborn, Scarlett
21	Recovery	Recovery	%	Trimborn, Scarlett	Fv/Fm recovery [% of initial]
22	Standard deviation	Std dev	±	Trimborn, Scarlett	Fv/Fm recovery [% of initial] std dev
23	Functional photosystem II reaction centers, per cell	RCII/cell	zmol/#	Trimborn, Scarlett
24	Functional photosystem II reaction centers, standard deviation	RCII std dev	±	Trimborn, Scarlett
25	Connectivity between photosystem II	p		Trimborn, Scarlett
26	Connectivity between photosystem II, standard deviation	p std dev	±	Trimborn, Scarlett
27	Functional absorption cross sections of photosystem II reaction centers	Sigma PSII	nm²	Trimborn, Scarlett
28	Functional absorption cross sections of photosystem II reaction centers, standard deviation	Sigma PSII std dev	±	Trimborn, Scarlett
29	Re-oxidation time of the Qa acceptor	tQa	µs	Trimborn, Scarlett
30	Re-oxidation time of the Qa acceptor, standard deviation	tQa std dev	±	Trimborn, Scarlett
31	Irradiance	E	µmol/m²/s	Trimborn, Scarlett
32	Electron transport rate, absolute	aETR	e/PSII/s	Trimborn, Scarlett
33	Electron transport rate, absolute, standard deviation	aETR std dev	±	Trimborn, Scarlett
34	Non photochemical quenching	NPQ		Trimborn, Scarlett
35	Non photochemical quenching, standard deviation	NPQ std dev	±	Trimborn, Scarlett

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

640 data points

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