dynamics

SPECIFIC COMPOSITION AND ABUNDANCE OF THE WINTER ZOOPLANKTON IN THE RYBINSK RESERVOIR

Authors: Lazareva V. I., Sokolova E. A.

The specific composition, seasonal dynamics, vertical and horizontal zooplankton distribution were studied in the pelagic zone and littoral of the Rybinsk reservoir in the winters of 2008 – 2016. The zooplankton abundance was found to be low (the abundance < 10,000 ind./m3, the biomass < 0.1 g/m3), by an order of magnitude lower than the values recorded in the 1970 – 1980s. As earlier, the abundance peak was observed in March. The cryophilic Cyclops kolensis prevailed among the crustaceans. A reproducing population of C.

CALANDRA LARK (MELANOCORYPHA CALANDRA) AND CORN BUNTING (MILIARIA CALANDRA) (PASSERIFORMES, AVES) CURRENT DISTRIBUTION AND ABUNDANCE ASSESSMENT IN THE NORTHERN LOWER-VOLGA REGION AND ADJACENT TERRITORIES

Authors: Belyachenko A. V., Piskunov V. V., Belyachenko A. A.

Features of the Calandra Lark and Corn Bunting spatial distribution and abundance dynamics in the Northern Lower-Volga region were studied in the framework of the «Atlas of breeding birds of European Russia» project. Significant habitat boundary changes to the north (Calandra Lark) and north-east (Corn Bunting) were found over the last 10 - 15 years. Extension limits of the habitat boundaries of both species studied in the European Russia were forecast.