Птицы озерных котловин южной части хребта Черского.

New data and analysis of the avifauna and bird species abundance are given for the lake systems of the southern part of the Chersky mountain ridge. In August - October of 2018 and in June and August of 2021, bird studies of lake basins of Ui, Momontay, Malyk, Darpir and Urultun lakes, situated at altitudes of 818-1234 meters above the sea level, were performed. 81 bird species were registered, of which 69 were recorded during breeding season, including 56 species referred to breeding and 13, to summering species. In comparison to the bird fauna of neighboring mountain areas, the avifauna of the studied lake systems is characterized by low species diversity, low percentage of widely-distributed species, and high percentage of boreal-hypoartcic and hypoarctic types of zonal- landscape distribution with clearly dominating species of the Siberian origin. Species content of the studied area is similar to that of the subalpine belt of Yakutia's northern mountains in the presence of Long-toed Stint, Red-throated Pipit and Pallas' Reed Bunting as well as, contrary to the subalpine belt of the Kolyma Highland, in the absence such species as Pine Grosbeak, Siberian Rubythroat, Pallas' Leaf Warbler, and Arctic Warbler on these elevations. On the other hand, the presence of such species as Ringed Plover and Dusky Warbler and the absence of Bluethroat is similar to the bird fauna of the Kolyma Highland subalpine belt. High abundance of both Beringian and Green-headed Yellow Wagtails sharing their habitats appeared to be a unique feature of the studied area. Confirmed breeding of Fieldfare on the elevations over 1000 m above the sea level significantly increases the knowledge on the distribution and ecology of this species.

The Spatial Variations of Water Quality and Effects of Water Landscape in Baiyangdian Lake, North China

Baiyangdian Lake (BYD), a large shallow lake in North China, has complex water landscape patterns that are underlies spatial variations in water quality. In this study, we collected 61 water samples from three water landscapes (reed littoral zones, fish ponds and open water) and analyzed them for water quality parameters, such as dissolved organic carbon (DOC), total nitrogen (TN), and total phosphorus (TP). Water landscape distribution (determined using remote sensing imagery) was then used to assess correlations between water quality parameters and water landscape proportion in differently scaled buffer zones. There was substantial variation across all subareas, with TN and TP concentrations ranging from 0.90–4.10 mg/L and 0.06–0.18 mg/L, respectively. Spatial variations in water quality were mainly caused by water landscape distribution and external nutrient inputs. There were negative correlations between DOC, TN, and TP concentrations and the area proportion of reed littoral zones in the 300 and 500 m buffers. In contrast, DOC, TN and TP concentrations were significantly positively correlated with the area proportion of fish ponds in the 100 m buffer. Furthermore, compared with reed littoral zones, a lower nitrogen to phosphorus ratio and a higher proportion of dissolved organic nitrogen and tyrosine-like proteins were found in fish ponds. These effects were mainly attributed to development of internal sediment loadings due to nutrient exchange between sediment and overlying water. Therefore, dredging-based sediment removal from fish ponds should be considered to suppress internal phosphorus loading and accelerate recovery of the BYD ecosystem.

FORECAST ON WATER QUALITY OF TO LICH RIVER BASED BY SCENES OF HA NOI SEWERAGE PLANNING BY MODEL QUAL2K

To Lich River is well-known as a main drainage river and plays a vital role to the landscape distribution of Hanoi city, which is currently polluted due to improperly untreated wastewater flow. Thanks to QUAL2K model, the variation of river water quality has been forecasted by 4 particular scenarios. For the first scenario, the whole generated wastewater along To Lich River is not totally collected and treated. For the second one, it occurs as the former one with an addition of diluted water of 5m3/s from Red river. Next, wastewater is mostly well managed but minor sources are not collected. Finally, the whole generated wastewater is properly treated and added with a diluted amount of 5m3/s from Red river. The study indicated that in order to meet standard of column B1, QCVN 08-MT:2015/BTNMT (Vietnam National Regulation), centralized and decentralized generated sewerage is required the appropriate treatment to reach column B National Standard 02:2014/BTNMT, with the BOD5 is lower than 20 mg/L before discharging into the nature.

New Data on Landscape Distribution of Ants of the Genus Myrmica Latr. (Hymenoptera, Formicidae) in the Baikal Region

Ants of the genus Myrmica Latr. are one of the abundant insects in many ecosystems of the Baikal region. Information on their landscape distribution is of great theoretical and practical value because Myrmica ants have important functions in the terrestrial ecosystems. The ants had been collected in the Irkutsk Region and the Republic of Buryatia from 2002 to 2011. The method of route survey with a strip width of 2 m was used. Garmin GPS 12 was used to register the geographical coordinates of the locations of the ants' nests. The collected ant specimens were fixed and stored in 1.5 ml Eppendorf microtubes filled with 95% ethanol. In total 151 nest samples were investigated. All material used in this study is stored in the entomological collection of the Core Facilities Center “Bioresource Center” at the Siberian Institute of Plant Physiology and Biochemistry SB RAS (Irkutsk, Russia). The analysis was carried out by means of GIS technology. The published map "Landscapes of the south of East Siberia" was the basis for this analysis. The V.B. Sochava’s methodical developments in the field of landscape studies were used. The main mapping units were geomes. Determination of the landscape distribution of ants was conducted by SQL-queries using a vector landscape layer and a point vector layer of the locations of the nests of ants. 14 species were identified during data processing. It has been found that the nests of ants were located within 15 geomes. M. angulinodis and M. ruginodis are the most common ants of the genus Myrmica in the Baikal region. The most of M. angulinodis nests (32.5%) were recorded in mountain taiga larch forests of limited development and the most of M. ruginodis nests (48.6%) are in the foothill subtaiga pine forests. The largest species number was recorded in the foothill subtaiga pine forests (six species) and the mountain west-transbaikalia geosystems of daurian type (five species). A more detailed picture of the landscape distribution of Myrmica ants was obtained in comparison with previous works. The obtained data on the landscape distribution of ants were in good agreement with field and literary data.