In late June ASPB in tandem with the RA NAS Institutes of Hydro-ecology, Ichthyology, Zoology and Ministry of Nature Protection conducted a joint research of the Lake Sevan. The study area included Lesser Sevan and some sections of Greater Sevan and the aim was to monitor ecological status of the lake.
The hydro-ecologists took the samples of phytoplankton, zooplankton, zoobenthos and phytobenthos, as well as measured the transparency and other parameters of the water. The researchers also took the samples of water for further study of hydroecological status of the lake based on hydrochemical and hydrophysical parameters.
As in the previous years, this year’s records included Great white egret, Little egret, Night heron and Glossy ibis. In the breeding colony we also observed three Little bitterns and Cattle egret which is extremely rare for this part of the country.Parallel with this survey, bird population monitoring has been held along the surveillance area, particularly in the reserve part of Gull Island.
The north eastern part of the island was occupied by a small breeding colony of Great Cormorant. Unlike the previous years when they nested in tree branches projecting from water, this year their nests were built on the ground.
Other species such as Gadwalls, Mallards and Ruddy shelducks were observed in small groups. Coots were recorded along the entire shores of the lake. Compared with last year, in the current year numbers of Great Crested and Little Grebes slightly decreased.
As the research results suggest, steady increase in the lake’s water level has beneficial impact on the avian fauna of the lake. Every year more and more new species breed at Lake Sevan while resident species increase in numbers.