Environmental changes affect picoplanktonic composition in Antarctic Peninsula pondsOA北大核心
Environmental changes affect picoplanktonic composition in Antarctic Peninsula ponds
Antarctic Peninsula is experiencing one of the largest global warming events worldwide.Shallow water bodies generated by the melting of snow in summer are numerous,and they might act as sentinels of climate change due to their rapid response and ability to integrate catchment information.Shifts in climate can influence the structure of microbial communities which dominate these freshwaters ecosystems.Here,we characterize three ponds at Cierva Point(Antarctic Peninsula)by examining their physico-chemical and morphological characteristics and we explored how different factors modify the structure of the microbial community.We studied the abundance and biomass of heterotrophic bacteria,picocyanobacteria and picoeukaryote algae during January and February of two consecutive summers(2017 and 2018).We found that ponds had different limnological characteristics,due to their location,geomorphological features and presence of the surrounding flora and fauna.Physico-chemical parameters as well as microbial community differed between ponds,months and years.In 2017,most ponds were oligo to mesotrophic states.The larger accumulated rainfall(as a result of environmental changes on the Antarctic Peninsula)during 2018,particularly in February,causes nutrient runoff into water bodies.This affects those ponds with the highest seabird circulation,such as gentoo penguin,increasing eutrophication.As a result,picoplanktonic abundances were higher,and the community structure shifts to a largely heterotrophic bacteria dominated one.These results suggest that these communities could act as sentinels to environmental changes,anticipating a future with mostly hypertrophic ponds.
Micaela DÍAZ;Leonardo LAGOMARSINO;Gabriela MATALONI;Marianela BELTRÁN;Marcela LIBERTELLI;Paulina FERMANI
Laboratorio de Ecología Acuática,INTECH-UNSAM-CONICET,Chascomús 7130,Argentina||Facultad de Ciencias Naturales y de la Salud,UNPSJB,Comodoro Rivadavia 9000,ArgentinaLaboratorio de Ecología Acuática,INTECH-UNSAM-CONICET,Chascomús 7130,ArgentinaLaboratorio de Biodiversidad,Limnología y Biología de la Conservación,3IA-UNSAM-CONICET,Buenos Aires 1650,ArgentinaDepartamento de Biología de Predadores Tope,Instituto Antártico Argentino,Buenos Aires 1650,Argentina||Laboratorio de Microbiología Ambiental,IBIOMAR/CESIMAR-CENPAT-CONICET,Puerto Madryn 9120,ArgentinaDepartamento de Biología de Predadores Tope,Instituto Antártico Argentino,Buenos Aires 1650,ArgentinaLaboratorio de Ecología Acuática,INTECH-UNSAM-CONICET,Chascomús 7130,Argentina||Laboratorio de Microbiología Ambiental,IBIOMAR/CESIMAR-CENPAT-CONICET,Puerto Madryn 9120,Argentina
microorganismsfreshwater environmentsclimate changeCierva Point
《极地科学进展（英文版）》 2024 (001)
108-122 / 15
This work was supported by ANPCyT(Grant PICT-2016-2517)directed by Dr.G.Mataloni and the National Scientific and Technical Research Council-Argentina(CONICET).The authors are grateful to Ejército Argentino members during summer campaigns 2017 and 2018,for the logistic support at Primavera Base and the Instituto Antártico Argentino-Dirección Nacional del Antártico.We would also like to thank to F.Bertone from Servicio Meteorológico Nacional of Argentina for providing weather parameters for the Antarctic Peninsula.Also thank to Y.Sica,L.Burdman,D.González and V.Casa,for their assistance in the field;as well as to R.Escaray,for his help with the determination of organic nitrogen and F.Unrein for shared data of picophytoplankton biovolume.We thank two anonymous reviewers for their valuable comments on the manuscript.
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