1. Periglacial Research Section; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research; Potsdam Germany
2. Institute of Earth and Environmental Science; University of Potsdam; Potsdam-Golm Germany
3. Department for Geography and Biology; North-Eastern Federal University of Yakutsk; Yakutsk Russia
4. Institute of Biochemistry and Biology; University of Potsdam; Potsdam-Golm Germany