[1] Charles Univ Prague, Fac Sci, Albertov 6, Prague, Czech Republic
[2] Czech Acad Sci, Inst Geol, Rozvojova 269, Prague, Czech Republic
[3] Univ Alaska Fairbanks, Inst Geophys, 903 N Koyukuk Dr, Fairbanks, AK 99775 USA
[4] GeoSci Consulting, Dewey, AZ 86327 USA
[5] Charles Univ Prague, Inst Environm Studies, Benatska 2, CZ-12801 Prague 2, Czech Republic
[6] Czech Acad Sci, Ctr Biol, Inst Hydrobiol, Sadkach 7, CZ-37005 Ceske Budejovice, Czech Republic
[7] Czech Acad Sci, Inst Geophys, Bocni 2 1401, CZ-14131 Prague 4, Czech Republic