toxins; waste; pollutants; climate-change; harmful bloom; monitoring; risk; cyanobacteria
Monchamp Marie-Eve, Spaak Piet, Pomati Francesco (2019), Long Term Diversity and Distribution of Non-photosynthetic Cyanobacteria in Peri-Alpine Lakes, in Frontiers in Microbiology
, 9, 1-11.
Monchamp Marie-Eve, Spaak Piet, Domaizon Isabelle, Dubois Nathalie, Bouffard Damien, Pomati Francesco (2018), Homogenization of lake cyanobacterial communities over a century of climate change and eutrophication, in Nature Ecology & Evolution
, 2(2), 317-324.
Monchamp Marie-Eve, Enache Ioana, Turko Patrick, Pomati Francesco, Rîşnoveanu Geta, Spaak Piet (2017), Sedimentary and egg-bank DNA from 3 European lakes reveal concurrent changes in the composition and diversity of cyanobacterial and Daphnia communities, in Hydrobiologia
, 800(1), 155-172.
Fontana Simone, Thomas Mridul Kanianthara, Moldoveanu Mirela, Spaak Piet, Pomati Francesco (2017), Individual-level trait diversity predicts phytoplankton community properties better than species richness or evenness, in The ISME Journal
, 12(2), 356-366.
Monchamp Marie-Eve, Walser Jean-Claude, Pomati Francesco, Spaak Piet (2016), Sedimentary DNA Reveals Cyanobacterial Community Diversity over 200 Years in Two Perialpine Lakes, in Applied and Environmental Microbiology
, 82(21), 6472-6482.
Drugă Bogdan, Turko Patrick, Spaak Piet, Pomati Francesco (2016), Cyanobacteria Affect Fitness and Genetic Structure of Experimental Daphnia Populations, in Environmental Science & Technology
, 50(7), 3416-3424.
DUMITRACHE A., MOLDOVEANU M., POSTOLACHE C., SANDU C., FLORESCU L. (2015), ENVIRONMENTAL FACTORS CONTROLLING CILIATES IN SHALLOW LAKES OF THE DANUBE DELTA – SPATIAL AND TEMPORAL VARIABILITY, in Proceedings of the 14th International Conference on Environmental Science and Technology Rhodes, Gre
Tardent Nadine, Tellenbach Christoph, Turko Patrick, Spaak Piet, Clonal structure and depth selection during a Caullerya mesnili epidemic in a hybridizing population of the Daphnia longispina complex, in Hydrobiologia
BackgroundNutrient pollution that started in the fifties led to eutrophication of lakes all over the world. The construction of waste water treatment plants has reversed this pattern in many countries (e.g. Switzerland) while in other countries (e.g. Romania) lakes still suffer under the consequences of water pollution. The Danube, the second largest river of Europe forms a delta of international importance at the confluence with the Black Sea. Pollution of the Danube, especially before 1990, led to eutrophication of the shallow lakes that, combined with climate change, favoured the development of massive cyanobacterial blooms that currently affect the seasonal succession of plankton and macrophyte communities. This has consequences for fish populations and the whole food web and potential impact on livestock- and human health. The dynamics and environmental context of these blooms is only documented in exceptional cases. Monitoring lakes throughout their phases of pollution and recovery takes decennia and requires a large investment in terms of personnel and resources. Datasets that allow to follow the history of cyanobacterial blooms in polluted lakes are rare, and totally missing for the Danube Delta - a biodiversity hotspot and UNESCO World Heritage Site of global importance.Aims and methodsThe goal of this research project is to reconstruct: i) the history of cyanobacterial blooms, ii) the occurrence of toxic genes from lake sediments, and iii) the effects of cyanobacteria on locally adapted zooplankton in the Danube Delta. Knowledge about this history is crucial to predict the risk for harmful cyanobacterial blooms in the context of environmental change and their consequences for lake food webs. The formerly hyper-eutrophied lake Greifensee, Switzerland, is an ideal study site to develop the method to reconstruct cyanobacterial blooms from sediment cores: historical data are available for zoo- and phytoplankton and for the population structure of the waterflea Daphnia. This is a key organism in aquatic food webs as it eats the algae and serves as fish food. Extensive field data will be collected from lake complexes in the Romanian part of the Danube Delta, to assess the occurrence of harmful cyanobacterial blooms. Since detailed long-term monitoring data are missing from those lakes, from sediment cores we will 1) reconstruct cyanobacterial bloom dynamics by lipid biomarkers, 2) evaluate the presence of toxic genes by PCR, 3) resurrect Daphnia from resting eggs, and 4) test pre- and post-eutrophication Daphnia populations for local adaptation to cyanobacterial blooms in laboratory experiments. For this work we apply for 1 PhD position at Eawag and two PhD students at IBB, furthermore we request funds to support the Romanian research team.Expected valueThe method we aim to develop in our project will be of high value for water managers in European countries, and especially in eastern European countries where eutrophication of lakes and rivers is still a high concern. The Danube Delta serves as an excellent case study. Sediments act as archives from which valuable information about the past can be extracted and analysed, overcoming the lack of expensive long-term monitoring programs that cannot be afforded. Our data will allow “learning from the past, preserving for the future”. We will assess whether the studied ecosystems are under risk with respect to harmful cyanobacterial blooms and our data will provide the possibility to forecast future developments, to develop protection strategies and to take measures to reduce risks in the future.