G. N. Gasanov
Sub-department of Recreation Geography and Sustainable Development, Dagestan State University, Makhachkala, Russia Laboratory of Biogeochemistry, Caspian Institute of Biological Resources, Dagestan Scientific Center, Russian Academy of Sciences, Makhachkala, Russia
Russian Federation

Doctor of Agricultural Sciences, Professor, head of the Laboratory of Biogeochemistry, Caspian Institute of Biological Resources, the Russian Academy of Sciences, Dagestan Scientific Center, 45 M. Gadjieva str., Makhachkala, 367023 Russia

M. A. Arslanov
Sub-department of Technical Exploitation of Automobiles, M.M. Dzhambulatov Dagestan State Agricultural University, Makhachkala, Russia
Russian Federation

Candidate of Technical Sciences, Associate Professor at the sub-department of Technical Exploitation of Automobiles, M.M. Dzhambulatov Dagestan State Agricultural University, Makhachkala, Russia.

A. A. Aytemirov
Sub-department of Recreation Geography and Sustainable Development, Dagestan State University, Makhachkala, Russia
Russian Federation

professor, sub-department of Recreational Geography and Sustainable Development, Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia