Phenotypic plasticity of coralline algae in a High CO2 world.
It is important to understand how marine calcifying organisms may acclimatize to ocean acidification to assess their survival over the coming century. We cultured the cold water coralline algae, Lithothamnion glaciale, under elevated pCO2 (408, 566, 770, and 1024 μatm) for 10 months. The results show that the cell (inter and intra) wall thickness is maintained, but there is a reduction in growth rate (linear extension) at all elevated pCO2. Furthermore a decrease in Mg content at the two highest CO2 treatments was observed. Comparison between our data and that at 3 months from the same long-term experiment shows that the acclimation differs over time since at 3 months, the samples cultured under high pCO2 showed a reduction in the cell (inter and intra) wall thickness but a maintained growth rate. This suggests a reallocation of the energy budget between 3 and 10 months and highlights the high degree plasticity that is present. This might provide a selective advantage in future high CO2 world.
GEOMAR, Helmholtz Centre for Ocean Research Wischhofstraße 1-3, 24148, Kiel, Germany ; Department of Earth Sciences, University of Bristol Wills Memorial Building, Queen's Road, BS8 1RJ, U.K.
Federica
F
Ragazzola
Laura C
LC
Foster
Armin U
AU
Form
Janina
J
Büscher
Thor H
TH
Hansteen
Jan
J
Fietzke
Climate change; coralline algae; long-term experiments; ocean acidification