A set of volcanic rock association rich in alkaline is formed. Their Nd and Sr isotopic characteristics show that the acidic volcanic rocks have high ε Sr (T) and low ε Nd (T) values, the initial ratio (N 87 Sr/N 86 Sr) 0 ranges from 0.710 20 to 0.710 50, upper crust end members are between 67%～50% and the rock is originated from deep crust with some mantle fluid.
In response to low environmental salinity, all three species closed the opercular plates firmly and rapidly used up oxygen within the mantle fluid.
Ventilation of the mantle cavity depended partially on external water flow, with higher and more stable mantle fluid oxygen concentrations being sustained when the water around barnacles was agitated.
Mantle fluid oxygen concentrations were extremely variable; behaviour and oxygen concentrations were not closely coupled.
When isolated, the mussels maintain a high osmotic concentration in the mantle fluid as the external salinity drops.
We also observed that both 3H-protein and 3H-glycine concentrations were higher in the mantle fluid than in the external sea water, although the ratios of 3H-glycine to 3H-protein in these two fluids were not different.