Communities of bottom macroinvertebrates in the streams of Anadyr river basin

The results of the monitoring of the Upper Anadyr tributaries are represented in the article. For the first time data on general composition of the bottom invertebrates of the Anadyr basin and quantitative pa-rameters of benthos development are given. The state of the benthos communities on the background sta-tions is unstable. Fauna composition of 3 orders of amphibiotic insects in the Chukotka streams is ana-lyzed. Today the list of mayflies includes 21 species, of stoneflies - 22 species, of caddisflies - 22 species.