Environmental changes affect picoplanktonic composition in Antarctic Peninsula ponds  

作　　者：Micaela DÍAZ Leonardo LAGOMARSINO Gabriela MATALONI Marianela BELTRÁN Marcela LIBERTELLI Paulina FERMANI 

机构地区：[1]Laboratorio de Ecología Acuática,INTECH-UNSAM-CONICET,Chascomús 7130,Argentina [2]Facultad de Ciencias Naturales y de la Salud,UNPSJB,Comodoro Rivadavia 9000,Argentina [3]Laboratorio de Biodiversidad,Limnología y Biología de la Conservación,3IA-UNSAM-CONICET,Buenos Aires 1650,Argentina [4]Departamento de Biología de Predadores Tope,Instituto Antártico Argentino,Buenos Aires 1650,Argentina [5]Laboratorio de Microbiología Ambiental,IBIOMAR/CESIMAR-CENPAT-CONICET,Puerto Madryn 9120,Argentina

出　　处：《Advances in Polar Science》2024年第1期108-122,共15页极地科学进展（英文版）

基　　金：supported by ANPCy T (Grant PICT-2016-2517) directed by Dr. G. Mataloni;the National Scientific and Technical Research Council-Argentina (CONICET)

摘　　要：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.

关 键 词：MICROORGANISMS freshwater environments climate change Cierva Point 

分 类 号：Q948.8[生物学—植物学] P941.61[天文地球—自然地理学]