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2. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins

Author

Mantzouki, E., Campbell, J., van Loon, E., Visser, P., Konstantinou, I., Antoniou, M., Giuliani, G., Machado-Vieira, D., Gurjão de Oliveira, A., Maronić, D.Š., Stević, F., Pfeiffer, T.Ž., Vucelić, I.B., Žutinić, P., Udovič, M.G., Plenković-Moraj, A., Tsiarta, N., Bláha, L., Geriš, R., Fránková, M., Christoffersen, K.S., Warming, T.P., Feldmann, T., Laas, A., Panksep, K., Tuvikene, L., Kangro, K., Häggqvist, K., Salmi, P., Arvola, L., Fastner, J., Straile, D., Rothhaupt, K.O., Fonvielle, J., Grossart, H.P., Avagianos, C., Kaloudis, T., Triantis, T., Zervou, S.K., Hiskia, A., Gkelis, S., Panou, M., McCarthy, V., de Senerpont Domis, L.N., Seelen, L., Verstijnen, Y., Lürling, M., Maliaka, V., Faassen, E.J., Mantzouki, E., Campbell, J., van Loon, E., Visser, P., Konstantinou, I., Antoniou, M., Giuliani, G., Machado-Vieira, D., Gurjão de Oliveira, A., Maronić, D.Š., Stević, F., Pfeiffer, T.Ž., Vucelić, I.B., Žutinić, P., Udovič, M.G., Plenković-Moraj, A., Tsiarta, N., Bláha, L., Geriš, R., Fránková, M., Christoffersen, K.S., Warming, T.P., Feldmann, T., Laas, A., Panksep, K., Tuvikene, L., Kangro, K., Häggqvist, K., Salmi, P., Arvola, L., Fastner, J., Straile, D., Rothhaupt, K.O., Fonvielle, J., Grossart, H.P., Avagianos, C., Kaloudis, T., Triantis, T., Zervou, S.K., Hiskia, A., Gkelis, S., Panou, M., McCarthy, V., de Senerpont Domis, L.N., Seelen, L., Verstijnen, Y., Lürling, M., Maliaka, V., and Faassen, E.J.

Abstract

Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.

Published
2018

3. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins

Author

European Cooperation in Science and Technology, Hernández, Armand [0000-0001-7245-9863], Mantzouki, E., Campbell, James, van Loon, E., Visser, P., Konstantinou, I., Antoniou, M., Giuliani, G., Machado-Vieira, D., Gurjão de Oliveira, Alinne, Maronić, D.Š., Stević, F., Hiskia, A., Gkelis, S., Walusiak, E., Panou, M., McCarthy, V., Budzyńska, A., Perello, V.C., Kostrzewska-Szlakowska, I., Gonçalves, V., Skjelbred, B., Palomino, Roberto L., Obertegger, U., Boscaini, A., Flaim, G., Salmaso, N., Gagala, I., Cerasino, L., Mankiewicz-Boczek, J., Hansson, L. A., Grabowska, M., Karpowicz, M., Rodríguez-Pérez, E., Chmura, D., Nawrocka, L., Kozak, A., Kobos, J., Rosińska, J., Seelen, L., Toporowska, M., Pawlik-Skowronska, B., Urrutia-Cordero, Pablo, Niedźwiecki, M., Maliaka, V., Pęczuła, W., Wasilewicz, M., Napiórkowska-Krzebietke, A., Ochocka, A., Beklioğlu, M., Szeląg-Wasielewska, E., Domek, P., Teurlincx, S., Jakubowska-Krepska, N., Tavşanoğlu, ÜN., Carballeira, R., Kwasizur, K., Drastichova, I., Messyasz, B., Chomova, L., Soylu, E.N., Pasztaleniec, A., Jasser, I., Filiz, N., Antão-Geraldes, A. M., Bilgin, F., Camacho, A., Özen, A., Leira, M., Hernández, Armand, Vasconcelos, V., Remec-Rekar, S., Pfeiffer, T.Ž., Eleršek, Tina, Delgado-Martín, Jordi, Yağcı, M.A., García, D., Bezirci, G., Bláha, L., Bravo, Andrea G., Verstijnen, Y., Cereijo, J. L., Gomà, Joan, Trapote, M.C., Vegas-Vilarrúbia, Teresa, Obrador, B., García-Murcia, A., Real, M., Picazo, Antoni, Vucelić, I.B., Romans, E., Cesur, M., Çınar, Ş., Lürling, M., Levi, E., Noguero-Ribes, J., Duque, D.P., Fernández-Morán, E., Úbeda, B., Yağcı, A., Gálvez, J.Á., Marcé, Rafael, Catalán, N., Buck, Moritz, Pérez-Martínez, Carmen, Ramos-Rodríguez, E., Tsiarta, N., Žutinić, P., Iskin, U., Çapkın, K., Udovič, M.G., Cillero-Castro, C., Moreno-Ostos, Enrique, Blanco, J. M., Rodríguez, V., Plenković-Moraj, Anđelka, Montes-Pérez, J.J., Colom-Montero, W., Koreivienė, J., Rochera, C., Santamans, A. C., Ferriol, C., Romo, S., Faassen, E.J., Soria, J. M., Latour, D., Mazur-Marzec, Hanna, Mustonen, K., Pierson, D., Kasperovičienė, J., Yang, Y., Verspagen, Jolanda M. H., Çelik, K., de Senerpont Domis, L.N., Özhan, K., Dunalska, J., Carey, C.C., Paerl, Hans, Alcaraz-Párraga, P., Torokne, A., Goldyn, R., Karan, T., Bulut, C., Demir, N., Uysal, R., Pełechata, A., Karakaya, N., Koçer, M.A.T., Sieńska, J., Yilmaz, M., Bańkowska-Sobczak, A., Savadova, K., Maraşlıoğlu, F., Geriš, R., Fakioglu, Ö., Fránková, M., Morais, J., Köker, L., Bergkemper, V., Pełechaty, M., O'Leary, S., Nemova, H., Vitonytė, I., Wilk-Woźniak, E., Beirne, E., Cromie, H., Ibelings, Bas W., Christoffersen, K. S., Warming, T.P., Feldmann, T., Laas, A., Vale, M., Panksep, K., Frąk, M., Kokocinski, M., Krztoń, W., Szymański, D., Tuvikene, L., Kangro, K., Häggqvist, K., Salmi, P., Arvola, L., Fastner, J., Straile, D., Haande, S., Rothhaupt, K. O., Fonvielle, J., Krstić, S., Raposeiro, P. M., Kruk, M., Madrecka, B., Grossart, Hans-Peter, Avagianos, C., Kaloudis, T., Triantis, T., Aleksovski, B., Zervou, S. K., European Cooperation in Science and Technology, Hernández, Armand [0000-0001-7245-9863], Mantzouki, E., Campbell, James, van Loon, E., Visser, P., Konstantinou, I., Antoniou, M., Giuliani, G., Machado-Vieira, D., Gurjão de Oliveira, Alinne, Maronić, D.Š., Stević, F., Hiskia, A., Gkelis, S., Walusiak, E., Panou, M., McCarthy, V., Budzyńska, A., Perello, V.C., Kostrzewska-Szlakowska, I., Gonçalves, V., Skjelbred, B., Palomino, Roberto L., Obertegger, U., Boscaini, A., Flaim, G., Salmaso, N., Gagala, I., Cerasino, L., Mankiewicz-Boczek, J., Hansson, L. A., Grabowska, M., Karpowicz, M., Rodríguez-Pérez, E., Chmura, D., Nawrocka, L., Kozak, A., Kobos, J., Rosińska, J., Seelen, L., Toporowska, M., Pawlik-Skowronska, B., Urrutia-Cordero, Pablo, Niedźwiecki, M., Maliaka, V., Pęczuła, W., Wasilewicz, M., Napiórkowska-Krzebietke, A., Ochocka, A., Beklioğlu, M., Szeląg-Wasielewska, E., Domek, P., Teurlincx, S., Jakubowska-Krepska, N., Tavşanoğlu, ÜN., Carballeira, R., Kwasizur, K., Drastichova, I., Messyasz, B., Chomova, L., Soylu, E.N., Pasztaleniec, A., Jasser, I., Filiz, N., Antão-Geraldes, A. M., Bilgin, F., Camacho, A., Özen, A., Leira, M., Hernández, Armand, Vasconcelos, V., Remec-Rekar, S., Pfeiffer, T.Ž., Eleršek, Tina, Delgado-Martín, Jordi, Yağcı, M.A., García, D., Bezirci, G., Bláha, L., Bravo, Andrea G., Verstijnen, Y., Cereijo, J. L., Gomà, Joan, Trapote, M.C., Vegas-Vilarrúbia, Teresa, Obrador, B., García-Murcia, A., Real, M., Picazo, Antoni, Vucelić, I.B., Romans, E., Cesur, M., Çınar, Ş., Lürling, M., Levi, E., Noguero-Ribes, J., Duque, D.P., Fernández-Morán, E., Úbeda, B., Yağcı, A., Gálvez, J.Á., Marcé, Rafael, Catalán, N., Buck, Moritz, Pérez-Martínez, Carmen, Ramos-Rodríguez, E., Tsiarta, N., Žutinić, P., Iskin, U., Çapkın, K., Udovič, M.G., Cillero-Castro, C., Moreno-Ostos, Enrique, Blanco, J. M., Rodríguez, V., Plenković-Moraj, Anđelka, Montes-Pérez, J.J., Colom-Montero, W., Koreivienė, J., Rochera, C., Santamans, A. C., Ferriol, C., Romo, S., Faassen, E.J., Soria, J. M., Latour, D., Mazur-Marzec, Hanna, Mustonen, K., Pierson, D., Kasperovičienė, J., Yang, Y., Verspagen, Jolanda M. H., Çelik, K., de Senerpont Domis, L.N., Özhan, K., Dunalska, J., Carey, C.C., Paerl, Hans, Alcaraz-Párraga, P., Torokne, A., Goldyn, R., Karan, T., Bulut, C., Demir, N., Uysal, R., Pełechata, A., Karakaya, N., Koçer, M.A.T., Sieńska, J., Yilmaz, M., Bańkowska-Sobczak, A., Savadova, K., Maraşlıoğlu, F., Geriš, R., Fakioglu, Ö., Fránková, M., Morais, J., Köker, L., Bergkemper, V., Pełechaty, M., O'Leary, S., Nemova, H., Vitonytė, I., Wilk-Woźniak, E., Beirne, E., Cromie, H., Ibelings, Bas W., Christoffersen, K. S., Warming, T.P., Feldmann, T., Laas, A., Vale, M., Panksep, K., Frąk, M., Kokocinski, M., Krztoń, W., Szymański, D., Tuvikene, L., Kangro, K., Häggqvist, K., Salmi, P., Arvola, L., Fastner, J., Straile, D., Haande, S., Rothhaupt, K. O., Fonvielle, J., Krstić, S., Raposeiro, P. M., Kruk, M., Madrecka, B., Grossart, Hans-Peter, Avagianos, C., Kaloudis, T., Triantis, T., Aleksovski, B., and Zervou, S. K.

Abstract

Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.

Published
2018

4. Climate change effects on shallow lakes: design and preliminary results of a cross-European climate gradient mesocosm experiment

Author

Landkildehus, F, primary, Søndergaard, M, primary, Beklioglu, M, primary, Adrian, R, primary, Angeler, D G, primary, Hejzlar, J, primary, Papastergiadou, E, primary, Zingel, P, primary, Çakiroğlu, A I, primary, Scharfenberger, U, primary, Drakare, S, primary, Nõges, T, primary, Šorf, M, primary, Stefanidis, K, primary, Tavşanoğlu, N, primary, Trigal, C, primary, Mahdy, A, primary, Papadaki, C, primary, Tuvikene, L, primary, Larsen, S E, primary, Kernan, M, primary, and Jeppesen, E, primary

Published
2014
Full Text
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5. The determination of ecological quality in shallow lakes - a tested system (EcoFrame) for implementation of the European Water Framework Directive

Author

Moss, B., Stephen, D., Alvarez, C., Bécares, E., Van de Bund, W.J., Collings, S.E., Van Donk, E., De Eyto, E., Feldmann, T., Fernández-Aláez, C., Fernandez-Aláez, M., Franken, R.J.M., García-Criado, F., Gross, E.M., Gyllström, M., Hansson, L-A., Irvine, K., Järvalt, A., Jensen, J.P., Jeppesen, E., Kairesalo, T., Kornijów, R., Krause, Tobias, Künnap, H., Laas, A., Lill, E., Lorens, B., Luup, H., Rosa Miracle, M., Nõges, P., Nõges, T., Nykänen, M., Ott, I., Peczula, W., Peeters, E.T.H.M., Philips, G., Romo, S., Russell, V., Salujõe, J., Scheffer, M., Siewertsen, K., Smal, H., Tesch, C., Timm, H., Tuvikene, L., Tonno, I., Virro, T., Vicente, E., Wilson, D., Aquatic Ecology (AqE), and Foodweb Studies

Subjects
phosphorus transfer-functions, zooplankton, Aquatic Ecology and Water Quality Management, WIMEK, conservation, Aquatische Ecologie en Waterkwaliteitsbeheer, danish lakes, top-down, trophic structure, land-use, phytoplankton, temperate lakes, management
Abstract

1. The European Water Framework Directive requires the determination of ecological status in European fresh and saline waters. This is to be through the establishment of a typology of surface water bodies, the determination of reference (high status) conditions in each element (ecotype) of the typology and of lower grades of status (good, moderate, poor and bad) for each ecotype. It then requires classification of the status of the water bodies and their restoration to at least good status in a specified period. 2. Though there are many methods for assessing water quality, none has the scope of that defined in the Directive. The provisions of the Directive require a wide range of variables to be measured and give only general guidance as to how systems of classification should be established. This raises issues of comparability across States and of the costs of making the determinations. 3. Using expert workshops and subsequent field testing, a practicable pan-European typology and classification system has been developed for shallow lakes, which can easily be extended to all lakes. It is parsimonious in its choice of determinands, but based on current limnological understanding and therefore as cost-effective as possible. 4. A core typology is described, which can be expanded easily in particular States to meet local conditions. The core includes 48 ecotypes across the entire European climate gradient and incorporates climate, lake area, geology of the catchment and conductivity. 5. The classification system is founded on a liberal interpretation of Annexes in the Directive and uses variables that are inexpensive to measure and ecologically relevant. The need for taxonomic expertise is minimized. 6. The scheme has been through eight iterations, two of which were tested in the field on tranches of 66 lakes. The final version, Version 8, is offered for operational testing and further refinement by statutory authorities [KEYWORDS: lakes Water Framework Directive typology ecotypes ecological status quality]

Published
2003

8. Factors controlling hydrochemical and trophic state variables in 86 shallow lakes in Europe

Author

Nõges, P., Nõges, T., Tuvikene, L., Smal, H., Ligeza, S., Kornijów, R., Peczula, W., Bécares, E., Garcia-Criado, F., Alvarez-Carrera, C., Fernandez-Alaez, C., Ferriol, C., Miracle, R.M., Vicente, E., Romo, S., Van Donk, E., Van de Bund, W.J., Jensen, J.P., Gross, E.M., Hansson, L-A., Gyllström, M., Nykänen, M., De Eyto, E., Irvine, K., Stephen, D., Collings, S.E., Moss, B., Nõges, P., Nõges, T., Tuvikene, L., Smal, H., Ligeza, S., Kornijów, R., Peczula, W., Bécares, E., Garcia-Criado, F., Alvarez-Carrera, C., Fernandez-Alaez, C., Ferriol, C., Miracle, R.M., Vicente, E., Romo, S., Van Donk, E., Van de Bund, W.J., Jensen, J.P., Gross, E.M., Hansson, L-A., Gyllström, M., Nykänen, M., De Eyto, E., Irvine, K., Stephen, D., Collings, S.E., and Moss, B.

Abstract

In order to disentangle the causes of variations in water chemistry among European shallow lakes, we performed standardised sampling programs in 86 lakes along a latitudinal gradient from southern Spain to northern Sweden. Lakes with an area of 0.1 to 27 000 ha and mean depth of 0.4–5.6 m located in low to high altitudes were investigated within the EC project ECOFRAME 1–4 times during June–October 2000–2001. Several variables like conductivity, alkalinity, abundance of submerged plants, concentrations of suspended solids, total nitrogen and phosphorus were latitude-dependent decreasing from south to north. Secchi depth, concentrations of total nitrogen, total phosphorus, suspended solids, and chlorophyll a correlated strongly with the presumed quality classes of the lakes. We came to the conclusion that the variability of shallow lakes in Europe is still mostly dependent on natural differences. Variables connected to lake morphometry, seasonality, basin geology and climate explained altogether nearly half of the total variability of lakes. The trophic state factor, describing mostly the human influence on lakes, was the strongest single factor responsible for nearly a quarter of the total variability of the studied European lakes [KEYWORDS: ecological status, European shallow lakes, hydrochemistry, latitude], In order to disentangle the causes of variations in water chemistry among European shallow lakes, we performed standardised sampling programs in 86 lakes along a latitudinal gradient from southern Spain to northern Sweden. Lakes with an area of 0.1 to 27 000 ha and mean depth of 0.4–5.6 m located in low to high altitudes were investigated within the EC project ECOFRAME 1–4 times during June–October 2000–2001. Several variables like conductivity, alkalinity, abundance of submerged plants, concentrations of suspended solids, total nitrogen and phosphorus were latitude-dependent decreasing from south to north. Secchi depth, concentrations of total nitrogen, total phosphorus, suspended solids, and chlorophyll a correlated strongly with the presumed quality classes of the lakes. We came to the conclusion that the variability of shallow lakes in Europe is still mostly dependent on natural differences. Variables connected to lake morphometry, seasonality, basin geology and climate explained altogether nearly half of the total variability of lakes. The trophic state factor, describing mostly the human influence on lakes, was the strongest single factor responsible for nearly a quarter of the total variability of the studied European lakes [KEYWORDS: ecological status, European shallow lakes, hydrochemistry, latitude]

Published
2003

15. Temperature effects explain continental scale distribution of cyanobacterial toxins

Author

Sigrid Haande, Christos Avagianos, Vítor Gonçalves, Lisette N. de Senerpont Domis, Carlos Rochera, Ana García-Murcia, Kerstin Häggqvist, Reyhan Akçaalan, Jordi Noguero-Ribes, Mariusz Pełechaty, Wojciech Krztoń, Hans-Peter Grossart, Jutta Fastner, Bárbara Úbeda, Wojciech Pęczuła, Nur Filiz, Justyna Kobos, Juan M. Soria, Elif Neyran Soylu, Lars-Anders Hansson, Filip Stević, Luděk Bláha, Hanna Mazur-Marzec, Jolanda M. H. Verspagen, Burçin Önem, Karl-Otto Rothhaupt, Nico Salmaso, Abdulkadir Yağcı, David Parreño Duque, Ksenija Savadova, Nusret Karakaya, Aleksandra Pełechata, Yvon Verstijnen, Carmen Pérez-Martínez, Pauliina Salmi, Gizem Bezirci, Tuğba Ongun Sevindik, Svetislav Krstić, Rahmi Uysal, Laura Seelen, Eloísa Ramos-Rodríguez, Spela Remec-Rekar, Sven Teurlincx, Monserrat Real, Meriç Albay, Donald C. Pierson, Susana Romo, Kristiina Mustonen, Kirsten Christoffersen, Valentini Maliaka, Estela Rodríguez-Pérez, Joanna Rosińska, Nilsun Demir, Mehmet Tahir Alp, Elvira Romans, João Morais, Daniel Szymański, Danielle Machado-Vieira, Damian Chmura, Evanthia Mantzouki, Teresa Vegas-Vilarrúbia, Antonio Picazo, Mikołaj Kokociński, Anastasia Hiskia, Christine Edwards, Yang Yang, Irma Vitonytė, Mehmet Cesur, Agnieszka Bańkowska-Sobczak, Iwona Kostrzewska-Szlakowska, Nikoletta Tsiarta, Anđelka Plenković-Moraj, Miquel Lürling, Ryszard Gołdyn, Kristel Panksep, Kemal Celik, Anna Kozak, Jose Luis Cereijo, Pablo Urrutia-Cordero, Petra M. Visser, Rodan Geriš, Uğur Işkın, Leonardo Cerasino, Kadir Çapkın, Victor C. Perello, Carmen Cillero-Castro, Arda Özen, Manel Leira, Enrique Moreno-Ostos, Şakir Çinar, Agnieszka Budzyńska, Faruk Maraşlıoğlu, Pedro M. Raposeiro, Theodoros M. Triantis, Agnieszka Pasztaleniec, Sevasti-Kiriaki Zervou, Elżbieta Wilk-Woźniak, Edward Walusiak, Kersti Kangro, Jorge Juan Montes-Pérez, Triantafyllos Kaloudis, Mari Carmen Trapote, Pablo Alcaraz-Párraga, José María Blanco, Marek Kruk, Hans W. Paerl, Lidia Nawrocka, Meryem Beklioglu, Antonio Camacho, Moritz Buck, Biel Obrador, Ilona Gagala, Lauri Arvola, Elżbieta Szeląg-Wasielewska, Petar Žutinić, Giovanna Flaim, Núria Catalán, R. Carballeira, Alinne Gurjão de Oliveira, Magdalena Frąk, Alo Laas, Magdalena Grabowska, Dubravka Špoljarić Maronić, Meral Apaydın Yağcı, Itana Bokan Vucelić, Ana Maria Antão-Geraldes, Tõnu Feldmann, Natalia Jakubowska-Krepska, Trine Perlt Warming, Armand Hernández, Anna C. Santamans, Fuat Bilgin, Cayelan C. Carey, Joana Mankiewicz-Boczek, Elísabeth Fernández-Morán, Mete Yilmaz, Iwona Jasser, Boris Aleksovski, Michał Wasilewicz, Agnieszka Ochocka, David García, Lea Tuvikene, Roberto L. Palomino, B.W. Ibelings, Hatice Tunca, Birger Skjelbred, Joan Gomà, Jūratė Karosienė, Maria G. Antoniou, Vitor Vasconcelos, Mehmet Ali Turan Koçer, Eti E. Levi, Markéta Fránková, Beata Madrecka, Barbara Pawlik-Skowrońska, Jeremy Fonvielle, Korhan Özkan, Maciej Karpowicz, Özden Fakioglu, Lucia Chomova, Magdalena Toporowska, Ülkü Nihan Tavşanoğlu, Jūratė Kasperovičienė, Latife Köker, Kinga Kwasizur, Koray Ozhan, Valeriano Rodríguez, William Colom-Montero, Ulrike Obertegger, Micaela Vale, Spyros Gkelis, Michał Niedźwiecki, Tunay Karan, Piotr Domek, Judita Koreivienė, Andrea G. Bravo, Justyna Sieńska, Jessica Richardson, Hana Nemova, Cafer Bulut, Jordi Delgado-Martín, Tanja Žuna Pfeiffer, Marija Gligora Udovič, Manthos Panou, Dietmar Straile, Rafael Marcé, Valerie McCarthy, Iveta Drastichova, Agnieszka Napiórkowska-Krzebietke, J. A. Gálvez, Tina Elersek, Beata Messyasz, Adriano Boscaini, Carmen Ferriol, Julita Dunalska, Freshwater and Marine Ecology (IBED, FNWI), BAİBÜ, Mühendislik Fakültesi, Çevre Mühendisliği Bölümü, Karakaya, Nusret, Universitat de Barcelona, Fakülteler, Fen - Edebiyat Fakültesi, Biyoloji Bölümü, Soylu, Elif Neyran, European Cooperation in Science and Technology, Université de Genève, Tokat Gaziosmanpaşa Üniversitesi, Lammi Biological Station, Doctoral Programme in Atmospheric Sciences, CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Yılmaz, Mete, Institute of Agricultural and Environmental Sciences, Mantzouki, Evanthia, Ibelings, Bastiaan Willem, Mantzouki, E, Lurling, M, Fastner, J, Domis, LD, Wilk-Wozniak, E, Koreiviene, J, Seelen, L, Teurlincx, S, Verstijnen, Y, Krzton, W, Walusiak, E, Karosiene, J, Kasperoviciene, J, Savadova, K, Vitonyte, I, Cillero-Castro, C, Budzynska, A, Goldyn, R, Kozak, A, Rosinska, J, Szelag-Wasielewska, E, Domek, P, Jakubowska-Krepska, N, Kwasizur, K, Messyasz, B, Pelechata, A, Pelechaty, M, Kokocinski, M, Garcia-Murcia, A, Real, M, Romans, E, Noguero-Ribes, J, Duque, DP, Fernandez-Moran, E, Karakaya, N, Haggqvist, K, Demir, N, Beklioglu, M, Filiz, N, Levi, EE, Iskin, U, Bezirci, G, Tavsanoglu, UN, Ozhan, K, Gkelis, S, Panou, M, Fakioglu, O, Avagianos, C, Kaloudis, T, Celik, K, Yilmaz, M, Marce, R, Catalan, N, Bravo, AG, Buck, M, Colom-Montero, W, Mustonen, K, Pierson, D, Yang, Y, Raposeiro, PM, Goncalves, V, Antoniou, MG, Tsiarta, N, McCarthy, V, Perello, VC, Feldmann, T, Laas, A, Panksep, K, Tuvikene, L, Gagala, I, Mankiewicz-Boczek, J, Yagci, MA, Cinar, S, Capkin, K, Yagci, A, Cesur, M, Bilgin, F, Bulut, C, Uysal, R, Obertegger, U, Boscaini, A, Flaim, G, Salmaso, N, Cerasino, L, Richardson, J, Visser, PM, Verspagen, JMH, Karan, T, Soylu, EN, Maraslioglu, F, Napiorkowska-Krzebietke, A, Ochocka, A, Pasztaleniec, A, Antao-Geraldes, AM, Vasconcelos, V, Morais, J, Vale, M, Koker, L, Akcaalan, R, Albay, M, Maronic, DS, Stevic, F, Pfeiffer, TZ, Fonvielle, J, Straile, D, Rothhaupt, KO, Hansson, LA, Urrutia-Cordero, P, Blaha, L, Geris, R, Frankova, M, Kocer, MAT, Alp, MT, Remec-Rekar, S, Elersek, T, Triantis, T, Zervou, SK, Hiskia, A, Haande, S, Skjelbred, B, Madrecka, B, Nemova, H, Drastichova, I, Chomova, L, Edwards, C, Sevindik, TO, Tunca, H, Onem, B, Aleksovski, B, Krstic, S, Vucelic, IB, Nawrocka, L, Salmi, P, Machado-Vieira, D, de Oliveira, AG, Delgado-Martin, J, Garcia, D, Cereijo, JL, Goma, J, Trapote, MC, Vegas-Vilarrubia, T, Obrador, B, Grabowska, M, Karpowicz, M, Chmura, D, Ubeda, B, Galvez, JA, Ozen, A, Christoffersen, KS, Warming, TP, Kobos, J, Mazur-Marzec, H, Perez-Martinez, C, Ramos-Rodriguez, E, Arvola, L, Alcaraz-Parraga, P, Toporowska, M, Pawlik-Skowronska, B, Niedzwiecki, M, Peczula, W, Leira, M, Hernandez, A, Moreno-Ostos, E, Blanco, JM, Rodriguez, V, Montes-Perez, JJ, Palomino, RL, Rodriguez-Perez, E, Carballeira, R, Camacho, A, Picazo, A, Rochera, C, Santamans, AC, Ferriol, C, Romo, S, Soria, JM, Dunalska, J, Sienska, J, Szymanski, D, Kruk, M, Kostrzewska-Szlakowska, I, Jasser, I, Zutinic, P, Udovic, MG, Plenkovic-Moraj, A, Frak, M, Bankowska-Sobczak, A, Wasilewicz, M, Ozkan, K, Maliaka, V, Kangro, K, Grossart, HP, Paerl, HW, Carey, CC, Ibelings, BW, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü, Ongun Sevindik, Tuğba, Tunca, Hatice, Hitit Üniversitesi, Fen Edebiyat Fakültesi, Biyoloji Bölümü, and Fen Edebiyat Fakültesi

Subjects
light climate, 0106 biological sciences, thermocline, Bacterial toxins, toksiinit, limit of quantitation, Toxines bacterianes, Microcystin-LR, Toxicology, 01 natural sciences, Anatoxin-a, analogs and derivatives, BLOOMS, Direct Effects, uracil, Water Pollutants, chemistry.chemical_classification, Temperatures, FRESH-WATER, latitude, maximum buoyancy frequency, 6. Clean water, climate change, Indirect effects, EUTROPHICATION, microcystin RR, articles, GROWTH, lämpötila, LAKES, microcystin, anatoxin, cylindrospermopsin, temperature, direct effects, indirect effects, spatial distribution, European Multi Lake Survey, epilimnetic temperature, ta1172, cyanobacteria, lakes, climate warming, microcystin, Zoology, Article, water pollutant, MICROCYSTIS-AERUGINOSA, Alkaloids, Settore BIO/07 - ECOLOGIA, NATURAL SCIENCES. Biology, Spatial distribution, Microcystis aeruginosa, Uracil, lake, syanobakteerit, Indirect Effects, liquid chromatography-mass spectrometry, 1172 Environmental sciences, Ekologi, nutrient, 010604 marine biology & hydrobiology, lcsh:R, microbiology, Climatic changes, microcystin LR, Anatoxin, Lakes, Spatial Distribution, chemistry, nodularin, microbial diversity, phytoplankton, ta1181, Cylindrospermopsin, Tropanes, Cyanobacteria, Aquatic Ecology and Water Quality Management, analysis, Health, Toxicology and Mutagenesis, lcsh:Medicine, environmental parameters, 010501 environmental sciences, medicine.disease_cause, nitrogen, chemistry.chemical_compound, sea surface temperature, environmental factor, ddc:550, Canvi climàtic, phosphorus, PRIRODNE ZNANOSTI. Biologija, limit of detection, Ecology, Cyanobacteria Toxins, biology, Temperature, levinneisyys, Nodularin, tropane derivative, Europe, DAPHNIA-MAGNA, İndirect Effects, Direct effects, microbial community, Environmental Monitoring, high performance liquid chromatography, Microcystins, Climate Change, Bacterial Toxins, Microcystin, välittömät oikeusvaikutukset, cyanobacterium, ddc:570, geographic distribution, medicine, bacterial toxin, controlled study, ddc:610, Institut für Biochemie und Biologie, 0105 earth and related environmental sciences, nonhuman, WIMEK, Toxin, longitude, PHYTOPLANKTON ASSEMBLAGES, Aquatic Ecology, NITROGEN AVAILABILITY, anatoxin a, Aquatische Ecologie en Waterkwaliteitsbeheer, biology.organism_classification, Climatic change, CLIMATE, 13. Climate action, response variable, Canvis climàtics
Abstract

Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains. © 2018 by the authors. Licensee MDPI, Basel, Switzerland., The authors acknowledge COST Action ES 1105 “CYANOCOST—Cyanobacterial blooms and toxins in water resources: Occurrence impacts and management” and COST Action ES 1201 “NETLAKE—Networking Lake Observatories in Europe” for contributing to this study through networking and knowledge sharing with European experts in the field. Evanthia Mantzouki was supported by a grant from the Swiss State Secretariat for Education, Research and Innovation (SERI) to Bas Ibelings and by supplementary funding from the University of Geneva. We thank Clare Ahnlund, Ena Suarez and Irene Gallego for helping out with the Swiss survey. We thank Wendy Beekman and Els J. Faassen for the nutrient and toxin analysis.

Published
2018

16. Data Descriptor: A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins

Author

Tunca, Hatice, Mantzouki, E, Campbell, J, van Loon, E, Visser, P, Konstantinou, I, Antoniou, M, Giuliani, G, Machado-Vieira, D, de Oliveira, AG, Maronic, DS, Stevic, F, Pfeiffer, TZ, Vucelic, IB, Zutinic, P, Udovic, MG, Plenkovic-Moraj, A, Tsiarta, N, Blaha, L, Geris, R, Frankova, M, Christoffersen, KS, Warming, TP, Feldmann, T, Laas, A, Panksep, K, Tuvikene, L, Kangro, K, Haggqvist, K, Salmi, P, Arvola, L, Fastner, J, Straile, D, Rothhaupt, KO, Fonvielle, J, Grossart, HP, Avagianos, C, Kaloudis, T, Triantis, T, Zervou, SK, Hiskia, A, Gkelis, S, Panou, M, McCarthy, V, Perello, VC, Obertegger, U, Boscaini, A, Flaim, G, Salmaso, N, Cerasino, L, Koreiviene, J, Karosiene, J, Kasperoviciene, J, Savadova, K, Vitonyte, I, Haande, S, Skjelbred, B, Grabowska, M, Karpowicz, M, Chmura, D, Nawrocka, L, Kobos, J, Mazur-Marzec, H, Alcaraz-Parraga, P, Wilk-Wozniak, E, Krzton, W, Walusiak, E, Gagala, I, Mankiewicz-Boczek, J, Toporowska, M, Pawlik-Skowronska, B, Niedzwiecki, M, Peczula, W, Napiorkowska-Krzebietke, A, Dunalska, J, Sienska, J, Szymanski, D, Kruk, M, Budzynska, A, Goldyn, R, Kozak, A, Rosinska, J, Szelag-Wasielewska, E, Domek, P, Jakubowska-Krepska, N, Kwasizur, K, Messyasz, B, Pelechata, A, Pelechaty, M, Kokocinski, M, Madrecka, B, Kostrzewska-Szlakowska, I, Frak, M, Bankowska-Sobczak, A, Wasilewicz, M, Ochocka, A, Pasztaleniec, A, Jasser, I, Antao-Geraldes, AM, Leira, M, Hernandez, A, Vasconcelos, V, Morais, J, Vale, M, Raposeiro, PM, Goncalves, V, Aleksovski, B, Krstic, S, Nemova, H, Drastichova, I, Chomova, L, Remec-Rekar, S, Elersek, T, Delgado-Martin, J, Garcia, D, Cereijo, JL, Goma, J, Trapote, MC, Vegas-Vilarrubia, T, Obrador, B, Garcia-Murcia, A, Real, M, Romans, E, Noguero-Ribes, J, Duque, DP, Fernandez-Moran, E, Ubeda, B, Galvez, JA, Marce, R, Catalan, N, Perez-Martinez, C, Ramos-Rodriguez, E, Cillero-Castro, C, Moreno-Ostos, E, Blanco, JM, Rodriguez, V, Montes-Perez, JJ, Palomino, RL, Rodriguez-Perez, E, Carballeira, R, Camacho, A, Picazo, A, Rochera, C, Santamans, AC, Ferriol, C, Romo, S, Soria, JM, Hansson, LA, Urrutia-Cordero, P, Ozen, A, Bravo, AG, Buck, M, Colom-Montero, W, Mustonen, K, Pierson, D, Yang, Y, Verspagen, JMH, Domis, LND, Seelen, L, Teurlincx, S, Verstijnen, Y, Lurling, M, Maliaka, V, Faassen, EJ, Latour, D, Carey, CC, Paerl, HW, Torokne, A, Karan, T, Demir, N, Beklioglu, M, Filiz, N, Levi, EE, Iskin, U, Bezirci, G, Tavsanoglu, UN, Celik, K, Ozhan, K, Karakaya, N, Kocer, MAT, Yilmaz, M, Maraslioglu, F, Fakioglu, O, Soylu, EN, Yagci, MA, Cinar, S, Capkin, K, Yagci, A, Cesur, M, Bilgin, F, Bulut, C, Uysal, R, Koker, L, Akcaalan, R, Albay, M, Alp, MT, Ozkan, K, Sevindik, TO, Tunca, H, Onem, B, Richardson, J, Edwards, C, Bergkemper, V, O'Leary, S, Beirne, E, Cromie, H, Ibelings, BW, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü, and Tunca, Hatice

Subjects
Science & Technology - Other Topics
Abstract

Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.

Published
2018

17. Opportunities for combining data of Estonian and Russian monitoring to reflect on water quality in large transboundary Lake Peipsi.

Author

Tammeorg O, Tuvikene L, Kondratyev S, Golosov S, Zverev I, Zadonskaya O, and Nõges P

Abstract

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 combining 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 example, 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., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2022 The Authors.)

Published
2022
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18. Sediment phosphorus mobility in Võrtsjärv, a large shallow lake: Insights from phosphorus sorption experiments and long-term monitoring.

Author

Tammeorg O, Nürnberg GK, Tõnno I, Kisand A, Tuvikene L, Nõges T, and Nõges P

Subjects
Environmental Monitoring, Eutrophication, Geologic Sediments, Phosphorus analysis, Lakes, Water Pollutants, Chemical analysis
Abstract

Sediment phosphorus (P) recycling is one of the key issues in lake water quality management. We studied sediment P mobility in Võrtsjärv, a large shallow lake in Estonia using both sorption experiments and long-term (1985-2020) monitoring data of the lake. Over the years studied, the lake has undergone a decline in external phosphorus loading (EL), while no improvement in phytoplankton indicators was observed. The results of the sorption experiments revealed that it may be successfully used as a tool to determine P forms involved in P retention, as up to 100% of the P from the water column was detected in sediments. Incubation of wet sediment is preferred to dry because of the sensitivity of organic P to desiccation. In the sediments of Võrtsjärv, the labile P (Lab-P) and iron bound (Fe-P) fractions are the major forms of the mobile pool that supply internal P load as sediment released P. The internal P load calculated from summer total P (TP) increases (IL in situ ) in the water column was on average 42%, but could reach 240% of EL at extreme environmental conditions. IL in situ was correlated with the active area, which resembles the area involved in redox-related P release in polymictic lakes, and with the mean bottom shear stress in summer. IL in situ showed a similar decreasing pattern as the external P load over the years 1985-2020, and was likely driven by the decrease of the pool of releasable P. Similarly, the decreases in sediment loading by P retention in our P sorption experiment were associated with decreases in the concentration of the potentially mobile P forms (mainly Lab-P and Fe-P). These results show that changes in external P loading can successfully control internal P loading and are useful in water quality management of large lakes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.)

Published
2022
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19. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins.

Author

Mantzouki E, Campbell J, van Loon E, Visser P, Konstantinou I, Antoniou M, Giuliani G, Machado-Vieira D, Gurjão de Oliveira A, Maronić DŠ, Stević F, Pfeiffer TŽ, Vucelić IB, Žutinić P, Udovič MG, Plenković-Moraj A, Tsiarta N, Bláha L, Geriš R, Fránková M, Christoffersen KS, Warming TP, Feldmann T, Laas A, Panksep K, Tuvikene L, Kangro K, Häggqvist K, Salmi P, Arvola L, Fastner J, Straile D, Rothhaupt KO, Fonvielle J, Grossart HP, Avagianos C, Kaloudis T, Triantis T, Zervou SK, Hiskia A, Gkelis S, Panou M, McCarthy V, Perello VC, Obertegger U, Boscaini A, Flaim G, Salmaso N, Cerasino L, Koreivienė J, Karosienė J, Kasperovičienė J, Savadova K, Vitonytė I, Haande S, Skjelbred B, Grabowska M, Karpowicz M, Chmura D, Nawrocka L, Kobos J, Mazur-Marzec H, Alcaraz-Párraga P, Wilk-Woźniak E, Krztoń W, Walusiak E, Gagala I, Mankiewicz-Boczek J, Toporowska M, Pawlik-Skowronska B, Niedźwiecki M, Pęczuła W, Napiórkowska-Krzebietke A, Dunalska J, Sieńska J, Szymański D, Kruk M, Budzyńska A, Goldyn R, Kozak A, Rosińska J, Szeląg-Wasielewska E, Domek P, Jakubowska-Krepska N, Kwasizur K, Messyasz B, Pełechata A, Pełechaty M, Kokocinski M, Madrecka B, Kostrzewska-Szlakowska I, Frąk M, Bańkowska-Sobczak A, Wasilewicz M, Ochocka A, Pasztaleniec A, Jasser I, Antão-Geraldes AM, Leira M, Hernández A, Vasconcelos V, Morais J, Vale M, Raposeiro PM, Gonçalves V, Aleksovski B, Krstić S, Nemova H, Drastichova I, Chomova L, Remec-Rekar S, Elersek T, Delgado-Martín J, García D, Cereijo JL, Gomà J, Trapote MC, Vegas-Vilarrúbia T, Obrador B, García-Murcia A, Real M, Romans E, Noguero-Ribes J, Duque DP, Fernández-Morán E, Úbeda B, Gálvez JÁ, Marcé R, Catalán N, Pérez-Martínez C, Ramos-Rodríguez E, Cillero-Castro C, Moreno-Ostos E, Blanco JM, Rodríguez V, Montes-Pérez JJ, Palomino RL, Rodríguez-Pérez E, Carballeira R, Camacho A, Picazo A, Rochera C, Santamans AC, Ferriol C, Romo S, Soria JM, Hansson LA, Urrutia-Cordero P, Özen A, Bravo AG, Buck M, Colom-Montero W, Mustonen K, Pierson D, Yang Y, M H Verspagen J, de Senerpont Domis LN, Seelen L, Teurlincx S, Verstijnen Y, Lürling M, Maliaka V, Faassen EJ, Latour D, Carey CC, W Paerl H, Torokne A, Karan T, Demir N, Beklioğlu M, Filiz N, E Levi E, Iskin U, Bezirci G, Tavşanoğlu ÜN, Çelik K, Özhan K, Karakaya N, Koçer MAT, Yilmaz M, Maraşlıoğlu F, Fakioglu Ö, Soylu EN, Yağcı MA, Çınar Ş, Çapkın K, Yağcı A, Cesur M, Bilgin F, Bulut C, Uysal R, Köker L, Akçaalan R, Albay M, Alp MT, Özkan K, Sevindik TO, Tunca H, Önem B, Richardson J, Edwards C, Bergkemper V, O'Leary S, Beirne E, Cromie H, and Ibelings BW

Subjects
Climate Change, Europe, Phytoplankton chemistry, Pigments, Biological, Cyanobacteria chemistry, Environmental Monitoring, Lakes
Abstract

Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.

Published
2018
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20. Factors controlling the three-decade long rise in cyanobacteria biomass in a eutrophic shallow lake.

Author

Cremona F, Tuvikene L, Haberman J, Nõges P, and Nõges T

Subjects
Animals, Biomass, Cladocera, Copepoda, Estonia, Phosphorus analysis, Rotifera, Cyanobacteria growth & development, Eutrophication, Lakes microbiology
Abstract

We aimed at quantifying the importance of limnological variables in the decadal rise of cyanobacteria biomass in shallow hemiboreal lakes. We constructed estimates of cyanobacteria (blue-green algae) biomass in a large, eutrophic lake (Estonia, Northeastern Europe) from a database comprising 28 limnological variables and spanning more than 50years of monitoring. Using a dual-model approach consisting in a boosted regression trees (BRT) followed by a generalized least squares (GLS) model, our results revealed that six variables were most influential for assessing the variance of cyanobacteria biomass. Cyanobacteria response to nitrate concentration and rotifer abundance was negative, whereas it was positive to pH, temperature, cladoceran and copepod biomass. Response to total phosphorus (TP) and total phosphorus to total nitrogen ratio was very weak, which suggests that actual in-lake TP concentration is still above limiting values. The most efficient GLS model, which explained nearly two thirds (r 2 =0.65) of the variance of cyanobacteria biomass included nitrate concentration, water temperature and pH. The very high number of observations (maximum n=525) supports the robustness of the models. Our results suggest that the decadal rise of blue-green algae in shallow lakes lies in the interaction between cultural eutrophication and global warming which bring in-lake physical and chemical conditions closer to cyanobacteria optima., (Copyright © 2017 Elsevier B.V. All rights reserved.)

Published
2018
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21. Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins.

Author

Mantzouki E, Lürling M, Fastner J, de Senerpont Domis L, Wilk-Woźniak E, Koreivienė J, Seelen L, Teurlincx S, Verstijnen Y, Krztoń W, Walusiak E, Karosienė J, Kasperovičienė J, Savadova K, Vitonytė I, Cillero-Castro C, Budzyńska A, Goldyn R, Kozak A, Rosińska J, Szeląg-Wasielewska E, Domek P, Jakubowska-Krepska N, Kwasizur K, Messyasz B, Pełechaty A, Pełechaty M, Kokocinski M, García-Murcia A, Real M, Romans E, Noguero-Ribes J, Duque DP, Fernández-Morán E, Karakaya N, Häggqvist K, Demir N, Beklioğlu M, Filiz N, Levi EE, Iskin U, Bezirci G, Tavşanoğlu ÜN, Özhan K, Gkelis S, Panou M, Fakioglu Ö, Avagianos C, Kaloudis T, Çelik K, Yilmaz M, Marcé R, Catalán N, Bravo AG, Buck M, Colom-Montero W, Mustonen K, Pierson D, Yang Y, Raposeiro PM, Gonçalves V, Antoniou MG, Tsiarta N, McCarthy V, Perello VC, Feldmann T, Laas A, Panksep K, Tuvikene L, Gagala I, Mankiewicz-Boczek J, Yağcı MA, Çınar Ş, Çapkın K, Yağcı A, Cesur M, Bilgin F, Bulut C, Uysal R, Obertegger U, Boscaini A, Flaim G, Salmaso N, Cerasino L, Richardson J, Visser PM, Verspagen JMH, Karan T, Soylu EN, Maraşlıoğlu F, Napiórkowska-Krzebietke A, Ochocka A, Pasztaleniec A, Antão-Geraldes AM, Vasconcelos V, Morais J, Vale M, Köker L, Akçaalan R, Albay M, Špoljarić Maronić D, Stević F, Žuna Pfeiffer T, Fonvielle J, Straile D, Rothhaupt KO, Hansson LA, Urrutia-Cordero P, Bláha L, Geriš R, Fránková M, Koçer MAT, Alp MT, Remec-Rekar S, Elersek T, Triantis T, Zervou SK, Hiskia A, Haande S, Skjelbred B, Madrecka B, Nemova H, Drastichova I, Chomova L, Edwards C, Sevindik TO, Tunca H, Önem B, Aleksovski B, Krstić S, Vucelić IB, Nawrocka L, Salmi P, Machado-Vieira D, de Oliveira AG, Delgado-Martín J, García D, Cereijo JL, Gomà J, Trapote MC, Vegas-Vilarrúbia T, Obrador B, Grabowska M, Karpowicz M, Chmura D, Úbeda B, Gálvez JÁ, Özen A, Christoffersen KS, Warming TP, Kobos J, Mazur-Marzec H, Pérez-Martínez C, Ramos-Rodríguez E, Arvola L, Alcaraz-Párraga P, Toporowska M, Pawlik-Skowronska B, Niedźwiecki M, Pęczuła W, Leira M, Hernández A, Moreno-Ostos E, Blanco JM, Rodríguez V, Montes-Pérez JJ, Palomino RL, Rodríguez-Pérez E, Carballeira R, Camacho A, Picazo A, Rochera C, Santamans AC, Ferriol C, Romo S, Soria JM, Dunalska J, Sieńska J, Szymański D, Kruk M, Kostrzewska-Szlakowska I, Jasser I, Žutinić P, Gligora Udovič M, Plenković-Moraj A, Frąk M, Bańkowska-Sobczak A, Wasilewicz M, Özkan K, Maliaka V, Kangro K, Grossart HP, Paerl HW, Carey CC, and Ibelings BW

Subjects
Alkaloids, Climate Change, Cyanobacteria Toxins, Environmental Monitoring, Europe, Temperature, Uracil analysis, Bacterial Toxins analysis, Cyanobacteria, Lakes microbiology, Microcystins analysis, Tropanes analysis, Uracil analogs & derivatives, Water Pollutants analysis
Abstract

Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains., Competing Interests: The authors declare no conflict of interest.

Published
2018
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22. Dissolved organic carbon and its potential predictors in eutrophic lakes.

Author

Toming K, Kutser T, Tuvikene L, Viik M, and Nõges T

Subjects
Carbon, Water, Water Pollutants, Chemical, Environmental Monitoring, Lakes
Abstract

Understanding of the true role of lakes in the global carbon cycle requires reliable estimates of dissolved organic carbon (DOC) and there is a strong need to develop remote sensing methods for mapping lake carbon content at larger regional and global scales. Part of DOC is optically inactive. Therefore, lake DOC content cannot be mapped directly. The objectives of the current study were to estimate the relationships of DOC and other water and environmental variables in order to find the best proxy for remote sensing mapping of lake DOC. The Boosted Regression Trees approach was used to clarify in which relative proportions different water and environmental variables determine DOC. In a studied large and shallow eutrophic lake the concentrations of DOC and coloured dissolved organic matter (CDOM) were rather high while the seasonal and interannual variability of DOC concentrations was small. The relationships between DOC and other water and environmental variables varied seasonally and interannually and it was challenging to find proxies for describing seasonal cycle of DOC. Chlorophyll a (Chl a), total suspended matter and Secchi depth were correlated with DOC and therefore are possible proxies for remote sensing of seasonal changes of DOC in ice free period, while for long term interannual changes transparency-related variables are relevant as DOC proxies. CDOM did not appear to be a good predictor of the seasonality of DOC concentration in Lake Võrtsjärv since the CDOM-DOC coupling varied seasonally. However, combining the data from Võrtsjärv with the published data from six other eutrophic lakes in the world showed that CDOM was the most powerful predictor of DOC and can be used in remote sensing of DOC concentrations in eutrophic lakes., (Copyright © 2016 Elsevier Ltd. All rights reserved.)

Published
2016
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