Projects per year
(Southern Ocean) by incubating living specimens across a range of aragonite saturation states for a maximum of 14 days. Specimens started dissolving almost immediately upon exposure to undersaturated conditions (Omega_Ar,0.8), losing 1.4% of shell mass per day. The observed rate of gross dissolution was different from that predicted by rate law kinetics of aragonite dissolution, in being higher at Var levels slightly above 1 and lower at Omega_Ar levels of between 1 and 0.8. This indicates that shell mass is affected by even transitional levels of saturation, but there is, nevertheless, some partial means of protection for shells when in undersaturated conditions. A function for gross dissolution against Var derived from the present observations was compared to a function for gross calcification derived by a different study, and showed that dissolution became the dominating process even at Omega_Ar levels close to 1, with net shell growth ceasing at an Omega_Ar of 1.03. Gross dissolution increasingly dominated net change in shell mass as saturation levels decreased below 1. As well as influencing their viability, such dissolution of pteropod shells in the surface layers will result in slower sinking velocities and decreased carbon and carbonate fluxes to the deep ocean.
- 1 Finished
Bakker, D., Zubkov, M., Achterberg, E., Brownlee, C., Johns, D., Lawson, T., Leakey, R., Moore, C., Nightingale, P., Poulton, A., Rees, A., Rickaby, R., Sanders, R., Schroeder, D., Sharples, J., Suggett, D., Tarling, G., Tyrrell, T., Young, J., Blomfield, D., Etchells, A. & Lee, G.
1/10/10 → 30/09/14