Planktonic Communities in the Torey Lakes (Zabaikalsky Krai) in a Low Water Year

Abstract

Lakes Barun-Torey and Zun-Torey are the largest water bodies in Zabaikalsky Krai, and they are characterized by long-term cyclic changes in the water level. Samples of the planktonic community (algae and invertebrates) were collected from the Torey Lakes in June, August, and October in the dry 2016. Collection and processing of the samples was carried out using standard hydrobiological methods. The aim of the study was to investigate the planktonic communities in the Torey Lakes. The lakes were in different hydrological phases: Barun-Torey was in the initial filling phase (with isolated small lakes present on the dried bed), and Zun-Torey was in the shallowing phase. Considerable differences were observed between the compositions and structures of the planktonic communities, which were determined by the mineral content of the water. Diverse littoral plankton developed, consisting of 2-25 taxa of algae (total number of taxa -46) and 2-15 species of invertebrates (total number of species -29) in the oligohaline small lakes on the bottom of Lake Barun-Torey. The abundance and biomass of aquatic organisms varied within very wide limits: for phytoplanktonfrom 0.7 × 10 3 to 1260.0 × 10 3 cells / L and from 0.1 to 1271.0 mg / m 3 , and for zooplankton -from 9.2 × 10 3 to 19370.0 × 10 3 individuals / m 3 and from 3.8 to 361.7 g / m 3 . Freshwater and euryhaline species were dominant. In polyhaline Lake Zun-Torey, the phytoplankton consisted of 3-12 taxa of algae (total number of taxa -18), and the invertebrate fauna included only 3 species. The abundance of phytoplankton varied from 12.4 × 10 3 to 310.7 × 10 3 cells / L and a biomass from 1.0 to 14.7 mg / m 3 , and the abundance of zooplankton varied from 55.1 × 10 3 to 1656.0 × 10 3 individuals / m 3 and a biomass from 1.1 to 85.5 g / m 3 . Euryhaline and halophilic species dominated.Особенности планктонных сообществ Торейских озер (Забайкальский край) в маловодный год Е.Ю. Афонина, Н.А. Ташлыкова Институт природных ресурсов, экологии и криологии СО РАН Россия, 672014, Чита, ул. Недорезова, 16а Озера Барун-Торей и Зун-Торей являются самыми крупными водоемами в Забайкальском крае, для них характерна хорошо выраженная цикличность, проявляющаяся в многолетних изменениях уровня воды. Материалом для работы послужили пробы, собранные на Торейских озерах в июне, августе, октябре в маловодный 2016 г. Сбор и обработка материалов проводилась согласно стандартным гидробиологическим методам. Целью работы стало изучение особенностей развития планктонных биоценозов Торейских озер, одновременно находящихся в разных гидрологических фазах: Барун-Торей -в начальной фазе наполнения, Зун-Торей -в фазе снижения уровня воды. В районе северной оконечности высохшего Барун-Торея в пределах дна его ложа отмечались мелкие водоемы, источником питания которых служила многолетняя мерзлота и разгрузка подземных вод по разлому, проходящему по западному берегу озера. В Зун-Торее продолжался процесс обмеления водоема, который закончился практически полным его высыханием осенью 2017 г. Состав и структура...

Torey lakes, Daursky State Nature Biosphere Reserve, Russia: long-term changes in environmental parameters

“…We have been studying the lakes for a number of years, which we have provisionally divided into periods, including three periods for the Lake Zun-Torey (high (1999 and 2003), intermediate (2007,2011) and low (2014 and 2016) lake levels) and two periods for Lake Barun-Torey (high water level (1999 and 2003) and the initial filling phase (2014,2016,2018,2020)). For the majority of the studies (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016), the methods used are described in detail by Tsybekmitova & Belozertseva (2014), Tsybekmitova (2018), Afonina & Tashlykova (2018, Bazarova et al (2019).…”