Influence of El Nino Southern Oscillation phenomenon on coastal phytoplankton in a mixohaline ecosystem on the southeastern of South America: Rio de la Plata estuary

MARINE POLLUTION BULLETIN

卷:98

Article

Belen Sathicq, Maria^1,2  Elena Bauer, Delia^1,3  Gomez, Nora^1,2 

[1] Univ Nacl La Plata, Inst Limnol Dr Raul A Ringuelet, Fac Ciencias Nat & Museo, RA-1900 La Plata, Buenos Aires, Argentina

[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

[3] Comis Invest Cient Prov Buenos Aires, Buenos Aires, DF, Argentina

关键词: Phytoplankton;    Structural responses;    El Nino Southern Oscillation phenomenon;    Freshwater tidal zone;    Rio de la Plata estuary;   

DOI  :  10.1016/j.marpolbul.2015.07.017

来源: Elsevier

【 摘 要 】

The aim of this study was to analyze the density, diversity, biomass and assemblage composition of the phytoplankton in relation to environmental conditions (physical, chemical, hydrological and meteorological variables), measured under the different scenarios caused by the ENSO phenomenon in the period between 2005 and 2012, in six sampling sites in the tidal freshwater zone of the Rio de la Plata estuary, covering almost 100 km of coastline. The results revealed changes in the structure of the phytoplankton, such as a significant reduction of diversity, and decreases in biomass and phytoplankton density, particularly during El Nino phases. Cyanobacteria were more abundant in the neutral periods, Chlorophyceae dominated La Nina phase while Bacyllariophyceae dominated El Nino. However, no complete replacement of species between cycles was observed. The results obtained were highly variable due to the inherent natural variability of the Rio de la Plata, emphasized by the anthropogenic impact in this area. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free