Seawater carbonate chemistry and photoinhibition in Desmarestia anceps

Ocean acidification and warming are affecting polar regions with particular intensity. Rocky shores of the Antarctic Peninsula are dominated by canopy-forming Desmarestiales. This study investigates the physiological and transcriptomic responses of the endemic macroalga Desmarestia anceps to a combi...

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Bibliographic Details
Main Authors: Iñiguez, Concepcion, Heinrich, Sandra, Harms, Lars, Gordillo, Francisco J L
Format: Dataset
Language:English
Published: PANGAEA 2017
Subjects:
Alkalinity
total
standard deviation
Aragonite saturation state
Benthos
Bicarbonate
Bicarbonate ion
Biomass/Abundance/Elemental composition
Bottles or small containers/Aquaria (<20 L)
Calcite saturation state
Calculated using CO2calc
Calculated using seacarb after Nisumaa et al. (2010)
Carbon
inorganic
dissolved
Carbon/Nitrogen ratio
Carbonate ion
Carbonate system computation flag
Carbon dioxide
Carotenoids
Chlorophyll a
Chlorophyll c1+c2
Chromista
Desmarestia anceps
Dissolved organic carbon release rate
Antarc*
Antarctic
Antarctic Peninsula
Ocean acidification
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.887648
https://doi.org/10.1594/PANGAEA.887648
Description
Summary:Ocean acidification and warming are affecting polar regions with particular intensity. Rocky shores of the Antarctic Peninsula are dominated by canopy-forming Desmarestiales. This study investigates the physiological and transcriptomic responses of the endemic macroalga Desmarestia anceps to a combination of different levels of temperature (2 and 7 °C), dissolved CO2 (380 and 1000 ppm), and irradiance (65 and 145 µmol photons/m**2/s). Growth and photosynthesis increased at high CO2 conditions, and strongly decreased at 2 °C plus high irradiance, in comparison to the other treatments. Photoinhibition at 2 °C plus high irradiance was evidenced by the photochemical performance and intensive release of dissolved organic carbon. The highest number of differentially regulated transcripts was observed in thalli exposed to 2 °C plus high irradiance. Algal 13C isotopic discrimination values suggested an absence of down-regulation of carbon-concentrating mechanisms at high CO2. CO2 enrichment induced few transcriptomic changes. There was high and constitutive gene expression of many photochemical and inorganic carbon utilization components, which might be related to the strong adaptation of D. anceps to the Antarctic environment. These results suggest that increased temperature and CO2 will allow D. anceps to maintain its productivity while tolerating higher irradiances than at present conditions.

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