抄録
In order to evaluate the impact of sequestration of CO, in the ocean to the deep-sea benthic community, in situ experiment using a free fall type of benthic chamber system was carried out in Kumano trough at a depth of 2,000 m. The exposure concentrations of CO2 averaged 5.000 μatm and 2.000 μatm for the two exposure chambers and an intact chamber as a control has prepared. The number of foraminifera declined in the chamber of 5.000 μatm pCO2 compared with the control. On the other hand, biomass of each taxa in the chamber of 2.000 μatm pCO2 was not changed. These results suggest that the threshold concentration of the acute effect of C02 for the benthic community is recognized between 2.000 and 5000 μatm.
