Repository logo

Browsing by Author "Berger, Stella"

Now showing 1 - 4 of 4
  • Global patterns and predictors of microplastic occurrence and abundance in lentic systems
    Publication . Nava, Veronica; Frezzotti, Maria Luce; Aherne, Julian; Alfonso, María B.; Geraldes, Ana Maria; Attermeyer, Katrin; Bah, Abdou R.; Bao, Roberto; Bartrons, Mireia; Berger, Stella; Biernaczyk, Marcin; Breider, Florian; Brookes, Justin; Cañedo-Argüelles, Miguel; Canle, Moisés; Capelli, Camilla; Carballeira, Rafael; Cereijo, Jose Luís; Christensen, Søren T.; Christoffersen, Kirsten Seestern; Clayer, Francois; Eyto, Elvira de; Domis, Lisette N. de Senerpont; Delgado, Martín Jordi; Doubek, Jonathan; Eaton, Ashley; Seyda, Erdogan; Erina, Oxana; Ersoy, Zeynep; Feuchtmayr, Heidrun; Fugère, Vincent F.; Galafassi, Silvia; Gonçalves, Vítor Manuel da Costa; Grossart, Hans-Peter; Hamilton, David; Hanson, Paul C.; Harris, Ted; Kankılıç, Gökben Başaran; Kessler, Rebecca; Jacquet, Stéphan; Kangur, Külli; Kiel, Christine; Knoll, Lesley; Kokorīte, Ilga; Lavoie, Isabelle; Leiva-Presa, Àngels; Lepori, Fabio; Lusher, Amy; Macintyre, Sally; Matias, Miguel; Matsuzaki, Shin-Ichiro; McCarthy, Valerie; McElarney, Yvonne; McNally, David; Belay, Berte Mekonen; Messyasz, Beata; Mlambo, Musa; Nandini, Sarma; Nodine, Emily; Özen, Arda; Ozkundakci, Deniz; Vazquez Perez, Ricardo; Pociecha, Agnieszka; Raposeiro, Pedro M.; Rõõm, Eva-Ingrid; Salmaso, Nico; Singaraju, S.S. Sarma; Saulnier-Talbot, Émilie; Scordo, Facundo; Sibomana, Claver; Stepanowska, Katarzyna; Tavşanoğlu, Ülkü Nihan; Tolotti, Monica; Udoh, Abel; Urrutia-Cordero, Pablo; Valois, Amanda; Vandergoes, Marcus; Verburg, Piet; Volta, Pietro; Wain, Danielle; Wesolek, Brian; Weyhenmeyer, Gesa; Wightman, Ryan; Wood, Susie; Naicheng, Wu; Zawiska, Izabela; Zawisza, Edyta; Zink, Lauren; Leoni, Barbara
    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.
    2020Conference object Open access Show more
  • Plastic debris in freshwater systems worldwide
    Publication . Nava, Veronica; Aherne, Julian; Alfonso, María B.; Geraldes, Ana Maria; Attermeyer, Katrin; Bao, Roberto; Bartrons, Mireia; Berger, Stella; Biernaczyk, Marcin; Bissen, Raphael; Brookes, Justin; Brown, David; Candian, Giulia; Cañedo-Argüelles, Miguel; Canle, Moisés; Capelli, Camilla; Cereijo, Jose Luís; Carballeira, Rafael; Chawchai, Sakonvan; Chen, Guangjie; Christensen, Søren T.; Christoffersen, Kirsten Seestern; Eyto, Elvira de; Delgado, Jorge; Doubek, Jonathan; Dusaucy, Julia; Erina, Oxana; Ersoy, Zeynep; Feuchtmayr, Heidrun; Lepori, Fabio; Frezzotti, Maria Luce; Galafassi, Silvia; Gateuille, David; Gonçalves, Vítor Manuel da Costa; Grossart, Hans-Peter; Hamilton, David; Kangur, Külli; Kankılıç, Gökben Başaran; Kessler, Rebecca; Kiel, Christine; Krynak, Edward M.; Leiva-Presa, Àngels; Matias, Miguel; Matsuzaki, Shin-Ichiro; McElarney, Yvonne; Mitchell, Mark; Messyasz, Beata; Mlambo, Musa; Motitsoe, Samuel N.; Owens, Caroline; Özkundakci, Deniz; Pinnow, Solvig; Pociecha, Agnieszka; Raposeiro, Pedro M.; Rõõm, Eva-Ingrid; Rotta, Federica; Salmaso, Nico; Scordo, Facundo; Sibomana, Claver; Siewert, Daniel; Stepanowska, Katarzyna; Sudeep, Chandra; Tavşanoğlu, Ülkü Nihan; Tereshina, Maria; Thompson, James; Tolotti, Monica; Valois, Amanda; Verburg, Piet; Wesolek, Brian; Weyhenmeyer, Gesa; Wu, Naicheng; Zawisza, Edyta; Zink, Lauren; Leoni, Barbara
    Plastic debris is widespread in freshwater ecosystems, but a rigorous assessment of its global distribution has been hindered by a lack of comprehensive and comparable data. We performed the first standardized global survey of lakes to assess the quantity and type of plastics (>250μm). We included 38 lakes located in 23 different countries distributed across five continents, spanning different environmental gradients and varying levels of anthropogenic stress. All samples were collected by horizontal trawling of a plankton net and subsequently treated with hydrogen peroxide. We identified 9425 plastic particles, which were classified based on shape, color, and size. Polymer identification was carried out using Raman micro-spectroscopy. Our results showed that the concentration of plastics spanned four orders of magnitude (10-3-101 particles/m3). Fibers (49%) and fragments (41%) were the most frequently detected particles, suggesting a secondary origin of plastic contamination. The most commonly identified polymers were polyester (30%), polypropylene (20%), and polyethylene (16%), which are widely used in short life-cycle products and account for the majority of global plastic production. Further, we found that urban-related attributes of lakes/watersheds influenced the occurrence and type of plastics in lentic systems and larger and deeper lakes with higher retention times are accumulating plastic debris at higher concentrations.
    2022Conference object Open access Show more
  • Plastic debris in lakes and reservoirs
    Publication . Nava, Veronica; Chandra, Sudeep; Aherne, Julian; Alfonso, María B.; Geraldes, Ana Maria; Attermeyer, Katrin; Bao, Roberto; Berger, Stella; Biernaczyk, Marcin; Bissen, Raphael; Brookes, Justin; Brown, David; Cañedo-Argüelles, Miguel; Canle, Moisés; Capelli, Camilla; Carballeira, Rafael; Cereijo, Jose Luís; Chawchai, Sakonvan; Christensen, Søren T.; Christoffersen, Kirsten Seestern; Eyto, Elvira de; Delgado, Jorge; Dornan, Tyler N.; Doubek, Jonathan; Dusaucy, Julia; Erina, Oxana; Ersoy, Zeynep; Feuchtmayr, Heidrun; Frezzotti, Maria Luce; Galafassi, Silvia; Gateuille, David; Gonçalves, Vítor; Grossart, Hans-Peter; Hamilton, David; Harris, Ted; Kangur, Kuelli; Kankılıç, Gökben Başaran; Kessler, Rebecca; Kiel, Christine; Krynak, Edward M.; Leiva-Presa, Àngels; Lepori, Fabio; Matias, Miguel G.; Matsuzaki, Shin-Ichiro; McElarney, Yvonne; Messyasz, Beata; Mitchell, Mark; Mlambo, Musa; Motitsoe, Samuel N.; Nandini, Sarma; Orlandi, Valentina; Owens, Caroline; Ozkundakci, Deniz; Pinnow, Solvig; Pociecha, Agnieszka; Raposeiro, Pedro M.; Room, Eva-Ingrid; Rotta, Federica; Salmaso, Nico; Sarma, Singaraju S.S.; Sartirana, Davide; Scordo, Facundo; Sibomana, Claver; Siewert, Daniel; Stepanowska, Katarzyna; Tavşanoğlu, Ülkü Nihan; Tereshina, Maria; Thompson, James; Tolotti, Monica; Valois, Amanda; Verburg, Piet; Welsh, Brittany; Wesolek, Brian; Weyhenmeyer, Gesa; Wu, Naicheng; Zawisza, Edyta; Zink, Lauren; Leoni, Barbara
    Plastic debris is thought to be widespread in freshwater ecosystems globally(1). However, a lack of comprehensive and comparable data makes rigorous assessment of its distribution challenging(2,3). Here we present a standardized cross-national survey that assesses the abundance and type of plastic debris (>250 mu m) in freshwater ecosystems. We sample surface waters of 38 lakes and reservoirs, distributed across gradients of geographical position and limnological attributes, with the aim to identify factors associated with an increased observation of plastics. We find plastic debris in all studied lakes and reservoirs, suggesting that these ecosystems play a key role in the plastic-pollution cycle. Our results indicate that two types of lakes are particularly vulnerable to plastic contamination: lakes and reservoirs in densely populated and urbanized areas and large lakes and reservoirs with elevated deposition areas, long water-retention times and high levels of anthropogenic influence. Plastic concentrations vary widely among lakes; in the most polluted, concentrations reach or even exceed those reported in the subtropical oceanic gyres, marine areas collecting large amounts of debris(4). Our findings highlight the importance of including lakes and reservoirs when addressing plastic pollution, in the context of pollution management and for the continued provision of lake ecosystem services.
    2023Journal article Open access Show more
  • The effects of hypoxia on zooplankton population estimates and migration in lakes
    Publication . Goldfarb, Sadye K.; Doubek, Jonathan; Geraldes, Ana Maria; Bartrons, Mireia; Berger, Stella; Brentrup, Jannifer; Brucet, Sandra; Burnet, Sarah; Caputo Galarce, Luciano; Carey, Cayelan C.; Christoffersen, Kirsten Seestern; Eyto, Elvira de; Dur, Gaël; Erdoğan, Şeyda; Erina, Oxana; Grossart, Hans-Peter; Kainz, Martin; Kankılıç, Gökben Başaran; Khan, Sami; Leoni, Barbara; Lepori, Fabio; McCarthy, Valerie; Nava, Veronica; Nejstgaard, Jens; Obertegger, Ulrike; Ogorelec, Ziga; Ozen, Arda; Pascual, Maria; Paterson, Michael; Patelli, Martina; Qiu, Qianlinglin; Richardson, David; Sepulveda-Jauregui, Armando; Silva, Lorena; Straile, Dietmar; Tartarotti, Barbara; Tavşanoğlu, Ülkü Nihan; Tereshina, Maria; Umaña-Villalobos, Gerardo; Walles, Tim; Wander, Heather; Wurtsbaugh, Wayne; Stockwell, Jason
    Many zooplankton species typically exhibit diel vertical migration (DVM), where zooplankton migrate from the hypolimnion to the epilimnion of lakes at night. Zooplankton exhibit this behavior to avoid visual predators and UV radiation by remaining in the bottom waters during the day and ascending to the surface waters to feed on phytoplankton at night. However, hypoxic conditions in the hypolimnion of lakes mayinterfere with DVM and force zooplankton to increase diel horizontal migration (DHM) to find predation refuge in littoral zones. Climate change and eutrophication are expected to increase the prevalence and severity of hypoxic conditions worldwide and thereby possibly alter zooplankton migration patterns. We hypothesize that hypoxia will force zooplankton to shift their migration patterns from predominantly DVM to DHM to avoid oxygen-depleted bottom waters. To test our hypothesis, we are conducting a standardized global sampling program to test whether pelagic, full water column estimates of zooplankton are greater at night versus the day under hypolimnetic hypoxic versus oxic conditions. Participants are aiming to sample at least one lake with an oxic hypolimnion and one lake with a hypoxic hypolimnion during the thermally-stratified period at midday and midnight. With our global dataset (currently expecting about 60 lakes in 22 countries), our goal is to improve our understanding of how global change may alter zooplankton migration behavior and patterns in lakes.
    2019Conference poster Open access Show more