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Effects of pCO2 on physiology and skeletal mineralogy in a tidal pool coralline alga Corallina elongata
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Effects of pCO2 on physiology and skeletal mineralogy in a tidal pool coralline alga Corallina elongata
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Effects of pCO2 on physiology and skeletal mineralogy in a tidal pool coralline alga Corallina elongata
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Journal Article
Effects of pCO2 on physiology and skeletal mineralogy in a tidal pool coralline alga Corallina elongata
2013
Overview
Marine organisms inhabiting environments where
p
CO
2
/pH varies naturally are suggested to be relatively resilient to future ocean acidification. To test this hypothesis, the effect of elevated
p
CO
2
was investigated in the articulated coralline red alga
Corallina elongata
from an intertidal rock pool on the north coast of Brittany (France), where
p
CO
2
naturally varied daily between 70 and 1000 μatm. Metabolism was measured on algae in the laboratory after they had been grown for 3 weeks at
p
CO
2
concentrations of 380, 550, 750 and 1000 μatm. Net and gross primary production, respiration and calcification rates were assessed by measurements of oxygen and total alkalinity fluxes using incubation chambers in the light and dark. Calcite mol % Mg/Ca (
m
Mg/Ca) was analysed in the tips, branches and basal parts of the fronds, as well as in new skeletal structures produced by the algae in the different
p
CO
2
treatments. Respiration, gross primary production and calcification in light and dark were not significantly affected by increased
p
CO
2
. Algae grown under elevated
p
CO
2
(550, 750 and 1000 μatm) formed fewer new structures and produced calcite with a lower
m
Mg/Ca ratio relative to those grown under 380 μatm. This study supports the assumption that
C. elongata
from a tidal pool, where
p
CO
2
fluctuates over diel and seasonal cycles, is relatively robust to elevated
p
CO
2
compared to other recently investigated coralline algae.
