Percorrer por autor "Chandra, Sudeep"
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- Do Zooplankton diversity-environment relationships derivedfrom space-for-time-substitution surveys actually represent any lakes?Publication . Stockwell, Jason; Symons, Celia; Figary, Stephanie; Alcocer, Javier; Alfonso, María B.; Anneville, Orlane; Geraldes, Ana Maria; Beklioğlu, Meryem; Beyer, Jessica; Blank, Kätlin; Bruel, Rosalie; Burnet, Sarah; Caroni, Rossana; Chandra, Sudeep; Christoffersen, Kirsten Seestern; Cortés, Alicia; Crispim, Maria Cristina; Warren Currie; Eyto, Elvira de; DeGasperi, Curtis; Diovisalvi, Nadia; Dondajewska-Pielka, Renata; Doubek, Jonathan; Dur, Gaël; Ersoy, Zeynep; Fernández, Rocío; Fontanarrosa, María Soledad; Gideon, Gal; García-Girón, Jorge; Ger, Kemal Ali; Goldyn, Ryszard; Guo, Fen; Hambright, K. David; Somia, Raslen; Jeppesen, Erik; Kainz, Martin; Kowalczewska-Madura, Katarzyna; Kuczyńska-Kippen, Natalia; Laas, Alo; Leoni, Barbara; López-Vázquez, Mercedes; Manca, Marina; Matsuzaki, Shin-Ichiro; Matthews, Blake; Merz,Ewa; Moe, Jannicke; Muñoz-Colmenares, Manuel; Nejstgaard, Jens; Obertegger, Ulrike; Oseguera, Luis A.; Paterson, Michael; Piscia, Roberta; Molina, Florencia Rojas; Rudstam, Lars; Rusak, James A.; Rusanovskaya, Olga O.; Salmaso, Nico; Sarvala, Jouko; Seda, Jaromír; Silow, Eugene; Soininen, Janne; Tartarotti, Barbara; Tavşanoğlu, Ülkü Nihan; Thackeray, Stephen; Timofeyev, Maxim; Zagarese, Horacio; Znachor, PetrSpace-For-Time-Substitution (SFTS) surveys are used todescribe zooplankton community structure, assess lakehealth, and forecast lake responses to environmental change. SFTS surveys combine single-point sampling from many lakes to evaluate zooplankton community structure and dynamics (e.g., abundance, diversity) and their responses to ecogeographical gradients in key environmental drivers (e.g., temperature, salinity), instead of tracking such responses in individual lakes. However, there liability and reproducibility of estimating temporal dynamics from models of SFTS survey data have yet to betested against observed community dynamics within lakes distributed worldwide. We use a recently compiled global dataset (292 lakes, 38 countries, 6 continents) of lake zooplankton time series to estimate the relationship between zooplankton diversity and potential environmental drivers using simulated SFTS surveys. We then apply the results to lakes with long-term time series to compare relationships derived from SFTS surveys with the historical dynamics of individual lakes. We expect that zooplankton dynamics in lakes from less variable thermal regions (i.e.,low and high latitudes) will not be well represented by temperature relationships derived from SFTS surveys. Testing biodiversity-ecosystem function relationships and their drivers requires adequate temporally and spatially resolved data. We provide a global perspective on thedesign of monitoring programs that include zooplankton and examine the reliability of zooplankton biodiversity patterns observed in SFTS surveys.
- Environmental Drivers of Nightversus Day Zooplankton Populationestimates In Lakes Around the WorldPublication . Goldfarb, Sadye K.; Doubek, Jonathan; Geraldes, Ana Maria; Armengol, Xavier; Avilés-Vargas, Lidia; Bartrons, Mireia; Bartrons, Mireia; Kankılıç, Gökben Başaran; Berger, Stella; Bess, Zach; Brentrup, Jannifer; Brucet, Sandra; Bruesewitz, Denise; Calderó-Pascual, Maria; Carey, Cayelan C.; Chandra, Sudeep; Chapina, Rosaura; Eyto, Elvira de; Erdoğan, Şeyda; Erina, Oxana; Figary, Stephanie; Gerrish, Gretchen; Glass, Lucas; Brett, Johnson; Kainz, Martin; Kalingali, Anthony; Khan, Samiullah; Kimirei, Ismael; Leoni, Barbara; Lepori, Fabio; McCarthy, Valerie; Nava, Veronica; Nejstgaard, Jens; Ogorelec, Ziga; O'Reilly, Catherine; Pate, William; Paterson, Michael; Pinheiro-Silva, Lorena; Qiu, Qianlinglin; Richardson, David; Rusak, James A.; Silver, Douglas; Straile, Dietmar; Suenaga, Erin; Tartarotti, Barbara; Tavşanoğlu, Ülkü Nihan; Tereshina, Maria; Umaña-Villalobos, Gerardo; Walles, Tim; Wander, Heather; Wurtsbaugh, Wayne; Xu, Yaoyang; Zhikharev, Vyacheslav; Stockwell, JasonZooplankton play vital roles in aquatic food webs by grazingon phytoplankton, which affects water quality, andtransferring energy to higher trophic levels. In freshwaterlakes, zooplankton commonly exhibit diel vertical andhorizontal migration. During the day, zooplankton descendto deeper waters, or seek refuge in littoral areas or thesediment-water interface, to avoid visual predators, andthen migrate to open water at night to feed. Consequently,zooplankton may exhibit higher density and biomass atnight versus the day, and estimates and perceptions ofzooplankton dynamics can change with the time of daysampling occurs. To better understand these dielzooplankton differences and their environmental drivers, weconducted a standardized global campaign to samplecrustacean zooplankton in the full water column at day andnight in the pelagic zone of 40 lakes. The lakes spanned agradient in trophic state, size, and other variables such asdissolved oxygen (DO). Mesotrophic and eutrophic lakesexhibited greater zooplankton biomass at night versus daywhile oligotrophic lakes did not. Crustacean zooplanktonhad higher biomass at night versus day in lakes at lowerelevation, with higher chlorophyll a concentration, and lowerhypolimnetic DO levels. Lake area and depth were notrelated to diel zooplankton density or biomass. We provideone of the first global, standardized studies onenvironmental drivers of day versus night zooplanktonpopulation estimates. This study has importantramifications for our understanding of zooplankton ecologyand for sampling regimens.
- Plastic debris in lakes and reservoirsPublication . 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, BarbaraPlastic 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.