Hello everyone! Does anybody know the minimum requirements of Unionids for carbon concentration in water for the shell construction?

I am asking because I found the glochidia of Unionidae on gills of European grayling in headwaters of Vishera River (Perm Krai, Russia) with water hardness 10-40 mg/l and Ca CO3 concentration 8-11...

25 September 2020 5,971 1 View