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Dynamics and structure of diatom communities in glacier and/or groundwater-fed streams.
Prüherová, Alžběta ; Kulichová, Jana (advisor) ; Žárský, Jakub (referee)
Alpine streams and their algal communities have been increasingly challenged in recent years by the effects of climate change, particularly associated with glacier retreat and their melting. Glaciers in particular are an important hydrological source for alpine ecosystems, which are threatened by rising temperatures, that are more influential in these areas than at lower altitudes. Due to the ongoing retreat of glaciers, glacier meltwater is increasingly being added to tributary streams. This glacier water has significantly different characteristics and may thus be a significant contributor to changes in the diatom biodiversity of alpine aquatic ecosystems. The manipulated experiment of this thesis took place from July to September 2020 in the Swiss Alps. Using permanent diatom slides created out of samples taken from the experimental channels, changes occurring when glacier meltwater was added to ground water-fed tributary streams and changes occurring when ground water was added to glacier-fed streams were analysed. Changes in diatom abundances were compared with environmental factors such as temperature, pH, turbidity or conductivity. Glacial streams were characterised by significantly lower temperature, higher values of conductivity and turbidity, higher oxygen saturation and also higher pH...
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Glacial Outburst Lakes in Kyrgyzstan (case study: Glacier Complex Adygine)
Falátková, Kristýna
In the context of changing climate retreat of mountain glaciers occurs at many places on the planet. One of the consequences is emergence or increase of the outburst risk at lakes situated in front of the glacier terminus. Flood caused by the glacial lake outburst often appear suddenly and can threaten settlements in lower parts of a valley. In the Kyrgyz mountains of Tien Shan there are about 350 lakes at risk of outburst, long-term monitored and dangerous locations are presented in this work. The highest attention is paid to Adygine area where several lakes of different genetic type and age can be found. The largest lake of the locality, the Upper Adygine lake, is subjected to more detailed survey aiming to asses its hydrological regime and to confirm or disprove speculation about outburst possibility of this lake. Keywords: glacial lake, hydrological regime, glacier retreat, Tien Shan, Kyrgyzstan
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Glacial Outburst Lakes in Kyrgyzstan (case study: Glacier Complex Adygine)
Falátková, Kristýna
In the context of changing climate retreat of mountain glaciers occurs at many places on the planet. One of the consequences is emergence or increase of the outburst risk at lakes situated in front of the glacier terminus. Flood caused by the glacial lake outburst often appear suddenly and can threaten settlements in lower parts of a valley. In the Kyrgyz mountains of Tien Shan there are about 350 lakes at risk of outburst, long-term monitored and dangerous locations are presented in this work. The highest attention is paid to Adygine area where several lakes of different genetic type and age can be found. The largest lake of the locality, the Upper Adygine lake, is subjected to more detailed survey aiming to asses its hydrological regime and to confirm or disprove speculation about outburst possibility of this lake. Keywords: glacial lake, hydrological regime, glacier retreat, Tien Shan, Kyrgyzstan
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Glacial Outburst Lakes in Kyrgyzstan (case study: Glacier Complex Adygine)
Falátková, Kristýna ; Janský, Bohumír (advisor) ; Hrdinka, Tomáš (referee)
In the context of changing climate retreat of mountain glaciers occurs at many places on the planet. One of the consequences is emergence or increase of the outburst risk at lakes situated in front of the glacier terminus. Flood caused by the glacial lake outburst often appear suddenly and can threaten settlements in lower parts of a valley. In the Kyrgyz mountains of Tien Shan there are about 350 lakes at risk of outburst, long-term monitored and dangerous locations are presented in this work. The highest attention is paid to Adygine area where several lakes of different genetic type and age can be found. The largest lake of the locality, the Upper Adygine lake, is subjected to more detailed survey aiming to asses its hydrological regime and to confirm or disprove speculation about outburst possibility of this lake. Keywords: glacial lake, hydrological regime, glacier retreat, Tien Shan, Kyrgyzstan
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