Impact of glacier changes on ecosystem of proglacial lakes in high mountain regions of East Siberia (Russia)

Vorobyeva, S. S.; Трунова, В. А.; Stepanova, O. G.; Зверева, В. П.; Petrovskii, S. K.; Melgunov, M. S.; Zheleznyakova, T. O.; Chechetkina, L. G.; Fedotov, Andrey

doi:10.1007/s12665-015-4164-6

Cited by 21 publications

(16 citation statements)

References 41 publications

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“…Glacial streams and lakes are characterized frequently as seasonal and diurnal runoff fluctuations that temporarily enhance sediment transport (Vorobyeva et al , ). The amount of meltwater and the extent of the thawed surface strata are closely related to seasonal and diurnal changes in precipitation and solar irradiation.…”

Section: Introductionmentioning

confidence: 99%

Meltwater erosion process of frozen soil as affected by thawed depth under concentrated flow in high altitude and cold regions

Ban

Lei

Chen

et al. 2017

Earth Surf Processes Landf

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Changes in thawed depth of frozen soil caused by diurnal and seasonal temperature fluctuations are commonly found in high altitude and latitude regions of the world. These changes significantly influence hydrologic and erosion processes. Experimental data are necessary to improve the understanding and modeling of the phenomenon. Laboratory experiments were conducted in Beijing to assess the impacts of thawed soil depth, slope gradient, and flow rate on soil erosion by concentrated meltwater flow over an underlying frozen soil layer. Soil samples from watershed were filled in flumes, saturated before being frozen. After the soil was completely frozen, flumes were taken out of storage to thaw the frozen soil from top to the designed depths. Meltwater flow was simulated using a tank filled with water and icecubes at approximately 0°C. The erosion experiments involved four thawed soil depths of 1, 2, 5, and 10 cm; three slope gradients of 5°, 10°, and 15°; and three flow rates of 1, 2, and 4 l/min; and seven rill lengths of 0.5, 1, 2, 3, 4, 5, and 6 m. Sediment-laden water samples were collected at the lower end of the flume for determination of sediment concentration. The results showed that sediment concentration increased exponentially with rill length to approach a maximum value. The sediment concentrations were closely correlated with thawed soil depth, flow rate, and slope gradient. Shallower thawed depths delivered more sediments than deeper thawed depths. Slope gradient was the primary factor responsible for severe erosion. The effect of flow rate on sediment concentration which decreased with increasing slope gradient, was not as significant as that of slope gradient. Results from these experiments are useful for understanding the effect of thawed soil depth on erosion process in thawed soils subject to freezing and for estimating erosion model parameters.

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Section: Introductionmentioning

confidence: 99%

Meltwater erosion process of frozen soil as affected by thawed depth under concentrated flow in high altitude and cold regions

Ban

Lei

Chen

et al. 2017

Earth Surf Processes Landf

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“…Recently, next-generation sequencing revealed high diversities of pro-and eukaryotes in a glacial turbid alpine lake (Kammerlander et al, 2015;Peter & Sommaruga, 2016). Although these lake types are in the spotlight of upcoming studies due to the strong progressive retreat of ice sheets in alpine and arctic regions (Sommaruga, 2015;Vorobyeva et al, 2015;Peter & Sommaruga, 2016), still virtually nothing is known about ciliates and other planktonic members in such lakes.…”

Section: Introductionmentioning

confidence: 99%

Ciliate community structure and interactions within the planktonic food web in two alpine lakes of contrasting transparency

et al. 2016

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Summary Climate warming is accelerating the retreat of glaciers and recently, many ‘new’ glacial turbid lakes have been created. In the course of time, the loss of the hydrological connectivity to a glacier causes, however, changes in their water turbidity and turns these ecosystems into clear ones.To understand potential differences in the food‐web structure between glacier‐fed turbid and clear alpine lakes, we sampled ciliates, phyto‐, bacterio‐ and zooplankton in one clear and one glacial turbid alpine lake, and measured key physicochemical parameters. In particular, we focused on the ciliate community and the potential drivers for their abundance distribution.In both lakes, the zooplankton community was similar and dominated by the copepod Cyclops abyssorum tatricus and rotifers including Polyarthra dolichoptera, Keratella hiemalis, Keratella cochlearis and Notholca squamula. The phytoplankton community structure differed and it was dominated by the planktonic diatom Fragilaria tenera and the cryptophyte alga Plagioselmis nannoplanctica in the glacial turbid lake, while chrysophytes and dinoflagellates were predominant in the clear one.Ciliate abundance and richness were higher in the glacial turbid lake (∼4000–27 800 Ind L−1, up to 29 species) than in the clear lake (∼570–7150 Ind L−1, up to eight species). The dominant species were Balanion planctonicum, Askenasia cf. chlorelligera, Urotricha cf. furcata and Mesodinium cf. acarus. The same species dominated in both lakes, except for Mesodinium cf. acarus and some particle‐associated ciliates, which occurred exclusively in the glacial turbid lake. The relative underwater solar irradiance (i.e. percentage of PAR and UVR at depth) significantly explained their abundance distribution pattern, especially in the clear water lake. In the glacial turbid lake, the abundance of the dominating ciliate taxa was mainly explained by the presence of predatory zooplankton.Our results revealed an unexpected high abundance and richness of protists (algae, ciliates) in the glacial turbid lake. This type of lake likely offers more suitable environmental conditions and resource niches for protists than the clear and highly UV transparent lake.

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“…In a nival-glacial belt are decreased nival-glacial part, the share of superficial moraines increases (Popovnin et al 2015) and lichens colonize rocks from under the glaciers. In the goletz belt, the mountain vegetation occupies moraine complexes (Timoshok et al 2008) and the ecology of the proglacial lakes is changing (Vorobyeva et al 2015;Stepanova et al 2015), the tundra extends up, and the wood vegetation moves ahead in the subalpinotype zone. The timberline in mountains of Southern Siberia practically did not change since LIA era, but sparse growth of trees in the depressions was formed, and separate trees promoted on 500 m towards glaciers.…”

Section: Resultsmentioning

confidence: 99%

Nival-glacial dynamics of geosystems in Eastern Siberia (Russia) for the last 50 years

Китов

Plyusnin

2015

Environ Earth Sci

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It is presented the results of studying of small glaciers located in the Eastern Siberia along transect the Kodar mountains -Baikalskiy and Barguzinskiy ridgesthe Eastern Sayan mountains. Some glaciers from this transect have not been described before. The inventorying of these glaciers is based on high-resolution satellite images and fieldworks. The most numbers of glaciers are located in the Kodar mountains and few are in the Baikalskiy and the Barguzinskiy ridges. Most likely, these glaciers remained mainly due to coldest winters and geomorphologic features. The main parameters of a glacier's data (the dynamics, the current state, cartographic representation, remote sensing data and others) are selected by analogy of the international glaciological database.

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Impact of glacier changes on ecosystem of proglacial lakes in high mountain regions of East Siberia (Russia)

Cited by 21 publications

References 41 publications

Meltwater erosion process of frozen soil as affected by thawed depth under concentrated flow in high altitude and cold regions

Meltwater erosion process of frozen soil as affected by thawed depth under concentrated flow in high altitude and cold regions

Ciliate community structure and interactions within the planktonic food web in two alpine lakes of contrasting transparency

Nival-glacial dynamics of geosystems in Eastern Siberia (Russia) for the last 50 years

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