Bioindicators and environmental protection I.M. Khanieva, S.A. Bekuzarova, R.Z. Abdulkhalikov, A.L. Boziev and Yu.M. Shogenov E3S Web of Conf., 222 (2020) 05002 Published online: 22 December 2020 DOI: 10.1051/e3sconf/202022205002