首页|Environmental changes affect picoplanktonic composition in Antarctic Peninsula ponds

Environmental changes affect picoplanktonic composition in Antarctic Peninsula ponds

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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.

microorganismsfreshwater environmentsclimate changeCierva Point

Micaela DíAZ、Leonardo LAGOMARSINO、Gabriela MATALONI、Marianela BELTRáN、Marcela LIBERTELLI、Paulina FERMANI

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Laboratorio de Ecología Acuática,INTECH-UNSAM-CONICET,Chascomús 7130,Argentina

Facultad de Ciencias Naturales y de la Salud,UNPSJB,Comodoro Rivadavia 9000,Argentina

Laboratorio de Biodiversidad,Limnología y Biología de la Conservación,3IA-UNSAM-CONICET,Buenos Aires 1650,Argentina

Departamento de Biología de Predadores Tope,Instituto Antártico Argentino,Buenos Aires 1650,Argentina

Laboratorio de Microbiología Ambiental,IBIOMAR/CESIMAR-CENPAT-CONICET,Puerto Madryn 9120,Argentina

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ANPCyTNational Scientific and Technical Research Council-Argentina(CONICET)

PICT-2016-2517

2024

10.12429/j.advps.2023.0018

极地科学进展(英文版)
中国极地研究中心,国家海洋局极地考察办公室 (Polar Research Institute of China, Chinese Arctic and Antarctic Administration)

极地科学进展(英文版)

影响因子：0.145
ISSN：1674-9928
年,卷(期)：2024.34(1)
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