A framework for ensemble modelling of climate change impacts on lakes worldwide : the ISIMIP Lake Sector

Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a single model forced with limited scenario-driven projections of future climate for a relatively small number of lakes. As a result, our understanding of the effects of climate change on lakes is fragmentary, based on scattered studies using different data sources and modelling protocols, and mainly focused on individual lakes or lake regions. This has precluded identification of the main impacts of climate change on lakes at global and regional scales and has likely contributed to the lack of lake water quality considerations in policy-relevant documents, such as the Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC). Here, we describe a simulation protocol developed by the Lake Sector of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) for simulating climate change impacts on lakes using an ensemble of lake models and climate change scenarios for ISIMIP phases 2 and 3. The protocol prescribes lake simulations driven by climate forcing from gridded observations and different Earth system models under various representative greenhouse gas concentration pathways (RCPs), all consistently bias-corrected on a 0.5 degrees x 0.5 degrees global grid. In ISIMIP phase 2, 11 lake models were forced with these data to project the thermal structure of 62 well-studied lakes where data were available for calibration under historical conditions, and using uncalibrated models for 17 500 lakes defined for all global grid cells containing lakes. In ISIMIP phase 3, this approach was expanded to consider more lakes, more models, and more processes. The ISIMIP Lake Sector is the largest international effort to project future water temperature, thermal structure, and ice phenology of lakes at local and global scales and paves the way for future simulations of the impacts of climate change on water quality and biogeochemistry in lakes.Peer reviewe

Effects of water temperature on summer periphyton biomass in shallow lakes: a pan-European mesocosm experiment

Periphyton communities play an important role in shallow lakes and are controlled by direct forces such as temperature, light, nutrients, and invertebrate grazing, but also indirectly by planktivorous fish predation. We performed a pan-European lake mesocosm experiment on periphyton colonization covering five countries along a north/south geographical/temperature gradient (Estonia, Germany, Czech Republic, Turkey, and Greece). Periphyton biomass on artificial polypropylene strips exposed at 50 cm water depth at low and high nutrient regimes (with mean total phosphorus concentration of 20 and 65 mu g L-1, respectively) was compared during mid-summer. No significant effect of nutrient loading on periphyton biomass was observed as nutrient concentrations in the mesocosms were generally above limiting values. Water temperature significantly enhanced summer periphyton biomass development. Additionally, direct and indirect top-down control of snails and fish emerged as a significant factor in periphyton biomass control

Global patterns and predictors of microplastic occurrence and abundance in lentic systems

The majority of microplastic research has focused on seawater, with fewer than 4% of microplasticsrelated studies occurring on freshwaters. The limited available information suggests that the abundance of microplastics in freshwaters is often as high or even higher than marine environments. However, comprehensive investigations on occurrence and fate of microplastics in freshwaters are scarce and highly fragmented, partly because detection and identification of microplastic particles is rather complex. In addition, up to now, harmonized and standardized protocols for the sampling and analysis of microplastics in freshwaters do not exist, and studies with different research aims and hypotheses often report unstandardized results, making comparison among studies difficult. In the present study, we performed the first global standardized sampling and analysis effort to investigate the occurrence and distribution of microplastics in surface water of lakes and reservoirs with different anthropogenic impacts. Participants aim to collect water samples of freshwater systems with different features (e.g., area, depth, thermal behavior, watershed), following a common protocol. This 18 establishes the collection of samples by horizontal trawling of a plankton net and, after treatment with hydrogen peroxide, the polymer identification through micro-Raman spectroscopy. This GLEON project will allow obtaining comparable data about microplastic contamination in different freshwater systems around the globe. With this global dataset, our goals are to determine whether a relationship exists between the abundance of microplastics and the waterbody/watershed attributes and understand which factors are likely to influence the occurrence of microplastics in surface water of lentic systems.info:eu-repo/semantics/publishedVersio

Global patterns and predictors of microplastic occurrence and abundance in lentic systems

The majority of microplastic research has focused on seawater, with fewer than 4% of microplasticsrelated studies occurring on freshwaters. The limited available information suggests that theabundance of microplastics in freshwaters is often as high or even higher than marine environments.However, comprehensive investigations on occurrence and fate of microplastics in freshwaters arescarce and highly fragmented, partly because detection and identification of microplastic particles israther complex. In addition, up to now, harmonized and standardized protocols for the sampling andanalysis of microplastics in freshwaters do not exist, and studies with different research aims andhypotheses often report unstandardized results, making comparison among studies difficult. In thepresent study, we performed the first global standardized sampling and analysis effort to investigatethe occurrence and distribution of microplastics in surface water of lakes and reservoirs with differentanthropogenic impacts. Participants aim to collect water samples of freshwater systems with differentfeatures (e.g., area, depth, thermal behavior, watershed), following a common protocol. This establishes the collection of samples by horizontal trawling of a plankton net and, after treatmentwith hydrogen peroxide, the polymer identification through micro-Raman spectroscopy. This GLEONproject will allow obtaining comparable data about microplastic contamination in different freshwatersystems around the globe. With this global dataset, our goals are to determine whether a relationshipexists between the abundance of microplastics and the waterbody/watershed attributes andunderstand which factors are likely to influence the occurrence of microplastics in surface water oflentic systems.Fil: Nava, Veronica. University Of Milano-Bicocca; ItaliaFil: Frezzotti, Maria Luce. University Of Milano-Bicocca; ItaliaFil: Aherne, Julian. Trent University; CanadáFil: Alfonso, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; ArgentinaFil: AntãoGeraldes, Ana M.. Instituto Politécnico De Bragança; PortugalFil: Attermeyer, Katrin. No especifíca;Fil: Bah, Abdou R.. City University of New York; Estados UnidosFil: Bao, Roberto. Universidad da Coruña; EspañaFil: Bartrons, Mireia. Universidad Politécnica de Catalunya; EspañaFil: Berger, Stella A.. Leibniz Institute for Zoo and Wildlife Research; AlemaniaFil: Biernaczyk, Marcin. No especifíca;Fil: Breider, Florian. Institute Of Environmental Engineering; SueciaFil: Brookes, Justin. University of Adelaide; AustraliaFil: Cañedo Argüelles, Miguel. Universidad de Barcelona; EspañaFil: Canle, Moisés. Universidad da Coruña; EspañaFil: Capelli, Camilla. Institute Of Earth Sciences; SueciaFil: Cereijo, José. Universidad da Coruña; EspañaFil: Carballeira, Rafael. Universidad da Coruña; EspañaFil: Christensen, Søren T.. Cphbusiness Laboratory And Environment; DinamarcaFil: Christoffersen, Kirsten S.. Universidad de Copenhagen; DinamarcaFil: Clayer, Francois. Norwegian Institute For Water Research; NoruegaFil: De Eyto, Elvira. Marine Institute; MayotteFil: De Senerpont Domis, Lisette N.. Netherlands Institute of Ecology; Países BajosFil: Jordi Delgado, Martín. Universidad da Coruña; EspañaFil: Doubek, Jonathan P.. Lake Superior State University; Estados UnidosFil: Eaton, Ashley. University of Vermont; Estados UnidosFil: Erdogan, Seyda. Bozok University; TurquíaFil: Erina, Oxana. Lomonosov Moscow State University; RusiaFil: Ersoy, Zeynep. Universidade De Évora; PortugalFil: Feuchtmayr, Heidrun. No especifíca;Fil: Fugère, Vincent. Université du Québec a Montreal; CanadáFil: Galafassi, Silvia. Water Research Institute; ItaliaFil: Gonçalves, Vitor. Universidad de Porto. Facultad de Ciências. Centro de Investigação em Biodiversidade e Recursos Genéticos; PortugalFil: Grossart, Hans Peter. No especifíca;Fil: Hamilton, David. Griffith University; AustraliaFil: Hanson, Paul C.. University of Wisconsin; Estados UnidosFil: Harris, Ted. University of Kansas; Estados UnidosFil: Başaran Kankılıç, Gökben. Kırıkkale University; TurquíaFil: Kessler, Rebecca. University of Kansas; Estados UnidosFil: Jacquet, Stéphan. No especifíca;Fil: Kangur, Külli. Estonian University Of Life Sciences; EstoniaFil: Kiel, Christine. No especifíca;Fil: Knoll, Lesley. University of Minnesota; Estados UnidosFil: Kokorīte, Ilga. No especifíca;Fil: Lavoie, Isabelle. Institut National De La Recherche Scientifique; CanadáFil: Leiva Presa, Àngels. No especifíca;Fil: Lepori, Fabio. University Of Applied Sciences And Arts Of Southern Switzerland; SuizaFil: Lusher, Amy. Norwegian Institute For Water Research; NoruegaFil: Macintyre, Sally. University of California; Estados UnidosFil: Matias, Miguel. Universidade De Évora; PortugalFil: Matsuzaki, Shin Ichiro S.. National Institute For Enviromental Studies; JapónFil: Mccarthy, Valerie. Dundalk Institute Of Technology; IrlandaFil: Mcelarney, Yvonne. Agri - Food And Bioscience Institute; IrlandaFil: Mcnally, David. Winooski High School; Estados UnidosFil: Mekonen Belay, Berte. Netherlands Institute Of Ecology; Países BajosFil: Messyasz, Beata. Adam Mickiewicz University In Poznan; PoloniaFil: Mlambo, Musa. Rhodes University. Albany Museum.; SudáfricaFil: Nandini, Sarma. Universidad Nacional Autónoma de México; MéxicoFil: Nodine, Emily. Rollins College; Estados UnidosFil: Özen, Arda. Çankırı Karatekin University; TurquíaFil: Ozkundakci, Deniz. Waikato Regional Council Science; Nueva ZelandaFil: Vazquez Perez, Ricardo. Universidad da Coruña; EspañaFil: Pociecha, Agnieszka. Institute Of Nature Conservation; PoloniaFil: Raposeiro, Pedro. Universidad de Porto. Facultad de Ciências. Centro de Investigação em Biodiversidade e Recursos Genéticos; PortugalFil: Rõõm, Eva Ingrid. Estonian University Of Life Sciences; EstoniaFil: Salmaso, Nico. Research And Innovation Centre; ItaliaFil: Sarma, Singaraju S. S.. Facultad De Estudios Superiores Iztacala; MéxicoFil: Saulnier Talbot, Émilie. Laval University. Centre Hospitalier de L'universite Laval; CanadáFil: Scordo, Facundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; ArgentinaFil: Sibomana, Claver. University Of Burundi; BurundiFil: Stepanowska, Katarzyna. West Pomeranian University Of Technology In Szczecin; PoloniaFil: Tavşanoğlu, Ü. Nihan. Çankırı Karatekin University; TurquíaFil: Tolotti, Monica. Research And Innovation Centre; ItaliaFil: Udoh, Abel. Gazi University; TurquíaFil: Urrutia Cordera, Pablo. Uppsala University; SueciaFil: Valois, Amanda. National Institute Of Water And Atmospheric Research; Nueva ZelandaFil: Vandergoes, Marcus. No especifíca;Fil: Verburg, Piet. National Institute Of Water And Atmospheric Research; Nueva ZelandaFil: Volta, Pietro. Water Research Institute - National Research Council; ItaliaFil: Wain, Danielle. No especifíca;Fil: Wesolek, Brian. Bay Mills Indian Community; Estados UnidosFil: Weyhenmeyer, Gesa. Uppsala University; SueciaFil: Wightman, Ryan. Agri - Food And Bioscience Institute; IrlandaFil: Wood, Susie. Cawthron Institute; Nueva ZelandaFil: Wu, Naicheng. Ningbo University; ChinaFil: Zawiska, Izabela. Polish Academy of Sciences; ArgentinaFil: Zawisza, Edyta. Polish Academy of Sciences; ArgentinaFil: Zink, Lauren. University Of Lethbridge; CanadáFil: Leoni, Barbara. University Of Milano Bicocca; ItaliaThe Global Lake Ecological Observatory Network All Hands' MeetingEstados UnidosGlobal Lake Ecological Observatory Networ