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Presentation at the 11th International Shallow Lakes Conference, Estonia 11.-16.06.2023. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963, by Estonian Ministry of the Environment through the state monitoring programme, and also from the Estonian Research Council grant PRG1167. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963, by Estonian Ministry of the Environment through the state monitoring programme, and also from the Estonian Research Council grant PRG1167.

Esitlus "Euroopa Horisondi“ uute taotlusvoorude infopäeval Eesti Maaülikoolis, 11.01.2023 This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963

Lake Peipsi, one of the world's largest lakes, is shared between Estonia and Russia. The water quality in different parts of the lake has so far been assessed independently. Here we explore opportunities for com-bining data of Estonian and Russian monitoring. For that, we 1) analysed the compatibility of data for some water quality variables; 2) estimated the potential effects of the differences in sampling frequency; 3) provided a few regression models to calculate the missing data for months not sampled by the Russian side. Data of the concurrent Estonian and Russian sampling indicated a good compatibility. Estonian data analysis suggested that water quality assessment results are sensitive to sampling frequency. For exam-ple, total phosphorus (TP) in the largest basin showed a long-term decreasing trend in three month data that disappeared when data for other months were added. Disregarding some months may lead to under -or overestimation of certain factors with no consistency in the response of different basins. Hence, data of the whole ice-free period are recommended for an adequate water quality assessment. Furthermore, we demonstrated that monthly values of the water quality variables of the same year are autocorrelated. Based on this, we filled the gaps in the long-term data and compiled a dataset for the whole lake that enables its most comprehensive use in water quality assessment and management. Long-term data revealed no water quality improvement of Lake Peipsi. Further reduction of the external nutrient load is needed. Eutrophication is sustained by high internal phosphorus load.(c) 2022 The Authors. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/ 4.0/).

EU Horizon 2020 Project „Towards Research Excellence and Innovation Capacity in Studying Lake Ecosystems’ Functional Structures and Climate Change Impact“ – TREICLAKE – aims to increase the scientific expertise of Estonian lake researchers to achieve larger impact not only in science but also in society at large. We tighten co-operation with two European high-level universities – University of Jyväskylä, Finland and Aarhus University, Denmark, to: • learn the newest scientific methodologies • publish high-level scientific articles and enable Open Access to them • better ivolve graduate students and early-stage researchers • increase our contribution to the formation of lake management policies • raise society's awareness of the necessity and possibilities of maintaining and improving the ecological condition of lakes. What is the use of lake science in the management and maintenance of lakes? Lea Tuvikene 16th International Living Lakes Conference, Puno, Peru, December 16-18, 2022 EU Horizon 2020 Project „Towards Research Excellence and Innovation Capacity in Studying Lake Ecosystems’ Functional Structures and Climate Change Impact“ – TREICLAKE – aims to increase the scientific expertise of Estonian lake researchers to achieve larger impact not only in science but also in society at large. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963. This work was supported by the Estonian Research Council grant PRG709.

Neljas üle-Eestiline avatud kalasadamate päev Limnoloogias, 2022. • Järved katavad 2070 km2 ehk 4,6% Eesti pindalast • 75,8% Eesti järvede pindalast on Peipsi Eesti-osa • Võrtsjärv moodustab 13% Eesti järvede pindalast Projekti toetab Horisont 2020, Euroopa Liidu teadusuuringute ja innovatsiooni raamprogramm grandiga nr. 951963. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951963