Citation:

PANGAEA.956864

Name: Seawater carbonate chemistry and growth rate of a bloom forming macroalga
Published: 2023-03-23
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Chlorophyta; Coast and continental shelf; Growth/Morphology; Laboratory experiment; Macroalgae; Macro-nutrients; North Pacific; Other metabolic rates; Plantae; Primary production/Photosynthesis; Respiration; Single species; Temperate; Ulva lactuca

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Abstract:

Introduction: The coastal macroalgal genus, Ulva, is found worldwide and is considered a nuisance algal genus due to its propensity for forming vast blooms. The response of Ulva to ocean acidification (OA) is of concern, particularly with nutrient enrichment, as these combined drivers may enhance algal blooms because of increased availability of dissolved inorganic resources.

Methods: We determined how a suite of physiological parameters were affected by OA and ammonium (NH4+) enrichment in 22-day laboratory experiments to gain a mechanistic understanding of growth, nutrient assimilation, and photosynthetic processes. We predicted how physiological parameters change across a range of pCO2 and NH4+ scenarios to ascertain bloom potential under future climate change regimes.

Results: During the first five days of growth, there was a positive synergy between pCO2 and NH4+ enrichment, which could accelerate initiation of an Ulva bloom. After day 5, growth rates declined overall and there was no effect of pCO2, NH4+, nor their interaction. pCO2 and NH4+ acted synergistically to increase NO3– uptake rates, which may have contributed to increased growth in the first five days. Under the saturating photosynthetically active radiation (PAR) used in this experiment (500 μmol photon/m**2/s), maximum photosynthetic rates were negatively affected by increased pCO2, which could be due to increased sensitivity to light when high CO2 reduces energy requirements for inorganic carbon acquisition. Activity of CCMs decreased under high pCO2 and high NH4+ conditions indicating that nutrients play a role in alleviating photodamage and regulating CCMs under high-light intensities.

Discussion: This study demonstrates that OA could play a role in initiating or enhancing Ulva blooms in a eutrophic environment and highlights the need for understanding the potential interactions among light, OA, and nutrient enrichment in regulating photosynthetic processes.

Keyword(s):

Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Chlorophyta; Coast and continental shelf; Growth/Morphology; Laboratory experiment; Macroalgae; Macro-nutrients; North Pacific; Other metabolic rates; Plantae; Primary production/Photosynthesis; Respiration; Single species; Temperate; Ulva lactuca

Supplement to:

Reidenbach, Leah B; Dudgeon, Steve R; Kübler, Janet E (2022): Ocean acidification and ammonium enrichment interact to stimulate a short-term spike in growth rate of a bloom forming macroalga. Frontiers in Marine Science, 9, 980657, https://doi.org/10.3389/fmars.2022.980657

Original version:

Reidenbach, Leah B; Kübler, Janet E; Dudgeon, Steve R (2021): Results from a study of physiological responses of Ulva lactuca to ocean acidification and nutrient enrichment. Biological and Chemical Oceanography Data Management Office (BCO-DMO), https://doi.org/10.26008/1912/bco-dmo.861111.1

Documentation:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James; Gentili, Bernard; Hagens, Mathilde; Hofmann, Andreas; Mueller, Jens-Daniel; Proye, Aurélien; Rae, James; Soetaert, Karline (2022): seacarb: seawater carbonate chemistry with R. R package version 3.3.1. https://cran.r-project.org/web/packages/seacarb/index.html

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Coverage:

Latitude: 34.041300 * Longitude: -118.567500

Event(s):

Malibu_OA * Latitude: 34.041300 * Longitude: -118.567500 * Method/Device: Experiment (EXP)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2022) 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 2023-03-20.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Reidenbach, Leah B		Study
2	Species, unique identification	Species UID		Reidenbach, Leah B
3	Species, unique identification (URI)	Species UID (URI)		Reidenbach, Leah B
4	Species, unique identification (Semantic URI)	Species UID (Semantic URI)		Reidenbach, Leah B
5	Experiment	Exp		Reidenbach, Leah B
6	Identification	ID		Reidenbach, Leah B		Pot number
7	Ammonium	[NH4]+	µmol/l	Reidenbach, Leah B		treatment
8	Ammonium	[NH4]+	µmol/l	Reidenbach, Leah B		The average difference between header tank NH4+ concentration and culture tank NH4+ concentration
9	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Reidenbach, Leah B		up to day 5
10	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Reidenbach, Leah B		on days 5 -10
11	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Reidenbach, Leah B		on days 10 - 20
12	Growth rate	µ	%/day	Reidenbach, Leah B		days 0 - 5 using fresh weight
13	Growth rate	µ	%/day	Reidenbach, Leah B		days 5 - 10 using fresh weight
14	Growth rate	µ	%/day	Reidenbach, Leah B		days 10 - 20 using fresh weight
15	Carbohydrates, in extract, per fresh mass	CHO/fm	mg/ml/g	Reidenbach, Leah B		at end of experiment
16	Proteins, in extract, per fresh mass	Prot/fm	mg/ml/g	Reidenbach, Leah B		at end of experiment
17	Nitrate reductase activity	NO3 reduct act	µmol/g/h	Reidenbach, Leah B
18	Ammonium	NH4	mg/kg	Reidenbach, Leah B		Internal NH4+ pools
19	Nitrate	NO3	mg/kg	Reidenbach, Leah B		Internal NO3- pools
20	Ammonium uptake rate	[NH4]+ upt rate	µmol/g/h	Reidenbach, Leah B		Measured in situ on day twenty of the trials 8 - 10 hours into the light cycle for a period of one hour.
21	Nitrate uptake rate	NO3 upt rate	µmol/g/h	Reidenbach, Leah B		Measured in situ on day twenty of the trials 8 - 10 hours into the light cycle for a period of one hour.
22	Maximum potential capacity of photosynthesis, oxygen	Pmax O2	µmol/g/min	Reidenbach, Leah B
23	Photosynthetic efficiency	FV/FM		Reidenbach, Leah B
24	Light saturation point	Ik	µmol/m²/s	Reidenbach, Leah B
25	Chlorophyll a	Chl a	µg/mg	Reidenbach, Leah B
26	Carbon, per tissue dry mass	C/dm tis	mg/mg	Reidenbach, Leah B
27	Nitrogen, per tissue dry mass	N/dm tis	mg/mg	Reidenbach, Leah B
28	Carbon/Nitrogen ratio	C/N		Reidenbach, Leah B		in algal tissue
29	Respiration rate, oxygen	Resp O2	µmol/g/min	Reidenbach, Leah B
30	Δδ13C	Δδ13C	‰ PDB	Reidenbach, Leah B		Discrimination of carbon stable isotopes = (d13Csource - d13Cplant) / (1 + d13Cplant)
31	δ15N	δ15N	‰	Reidenbach, Leah B		Ratio of nitrogen stable isotopes 15N:14N
32	Temperature, water	Temp	°C	Reidenbach, Leah B
33	Salinity	Sal		Reidenbach, Leah B
34	Salinity, standard error	Sal std e	±	Reidenbach, Leah B
35	pH	pH		Reidenbach, Leah B		total scale
36	pH, standard error	pH std e	±	Reidenbach, Leah B		total scale
37	Carbon dioxide	CO2	µmol/kg	Reidenbach, Leah B
38	Carbon dioxide, standard error	CO2 std e	±	Reidenbach, Leah B
39	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Reidenbach, Leah B
40	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error	pCO2water_SST_wet std e	±	Reidenbach, Leah B
41	Bicarbonate ion	[HCO3]-	µmol/kg	Reidenbach, Leah B
42	Bicarbonate ion, standard error	[HCO3]- std e	±	Reidenbach, Leah B
43	Carbonate ion	[CO3]2-	µmol/kg	Reidenbach, Leah B
44	Carbonate ion, standard error	[CO3]2- std e	±	Reidenbach, Leah B
45	Carbon, inorganic, dissolved	DIC	µmol/kg	Reidenbach, Leah B
46	Carbon, inorganic, dissolved, standard error	DIC std e	±	Reidenbach, Leah B
47	Alkalinity, total	AT	µmol/kg	Reidenbach, Leah B
48	Alkalinity, total, standard error	AT std e	±	Reidenbach, Leah B
49	Aragonite saturation state	Omega Arg		Reidenbach, Leah B
50	Aragonite saturation state, standard error	Omega Arg std e	±	Reidenbach, Leah B
51	Calcite saturation state	Omega Cal		Reidenbach, Leah B
52	Calcite saturation state, standard error	Omega Cal std e	±	Reidenbach, Leah B
53	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
54	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
55	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)
56	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)
57	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
58	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
59	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
60	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
61	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

1175 data points

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