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In 2018, 107 species, subspecies, and generic names were found in the zooplankton of the Argun River basin; the number of Cladocera was 52, Rotifera-43, and Copepoda-12. Planktofauna was characterized by high species richness due to the basin location in the Amur transitional zoogeographic region and diverse natural conditions in the area. Species that are rare in the Zabaikalsky Krai and Russia were found. According to the data from the observation stations, the number of species varied significantly in the Argun River basin and its tributaries. Species diversity index varied from 1.75 to 3.87 bits / copy. The number of species decreased in the Argun River basin with distance from the upper section, which is a very swampy floodplain.

Ðåзюìå Иññлåдîâанèя бåлîбрюõîгî îрлана (Haliaeetus leucogaster) ïрîâîдèлèñь ñ 2006 ïî 2016 гг. â раéîнå Раéгад â шòаòå Маõарашòра на ïрèбрåжнîм у÷аñòêå ïрîòяжённîñòью 106 êм. Бûлè âûяâлåнû ïрåдïî÷òèòåльнûå мåñòîîбèòанèя è мåñòа гнåçдîâанèя бåлîбрюõîгî îрлана. Ïрè ïрîâåдåнèè èññлåдîâанèé â ñåâåрнîé ÷аñòè Раéгада бûлî îòмå÷åнî умåньшåнèå ÷èñла гнåçдяùèõñя ïар îрланîâ.  ñòаòьå èçлîжåнû ïрè÷èнû эòîгî ñнèжåнèя è данû рåêîмåндацèè ïî âîññòанîâлåнèю ñрåдû îбèòанèя.

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