Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)

We analyzed the phytoplankton present in the lower sector of the Salado River (Buenos Aires, Argentina) for 10 years (1995-2005) and detected significant changes occurring in chlorophyte abundance and species richness during La Niña event (1998-1999), which period was analyzed throughout the entire...

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Autores principales: Solari, Lía Cristina, Gabellone, Néstor Adrián, Claps, María Cristina, Casco, María Adela, Quaíni, Karina Paola, Neschuk, Nancy Carolina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Naturales
Argentina
Chlorophytes
El Niño-La Niña-Southern Oscillation events
Monoraphidium
Plankton
Saline lowland river
The indicator value
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85163
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85163
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Argentina
Chlorophytes
El Niño-La Niña-Southern Oscillation events
Monoraphidium
Plankton
Saline lowland river
The indicator value
spellingShingle Ciencias Naturales
Argentina
Chlorophytes
El Niño-La Niña-Southern Oscillation events
Monoraphidium
Plankton
Saline lowland river
The indicator value
Solari, Lía Cristina
Gabellone, Néstor Adrián
Claps, María Cristina
Casco, María Adela
Quaíni, Karina Paola
Neschuk, Nancy Carolina
Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
topic_facet Ciencias Naturales
Argentina
Chlorophytes
El Niño-La Niña-Southern Oscillation events
Monoraphidium
Plankton
Saline lowland river
The indicator value
description We analyzed the phytoplankton present in the lower sector of the Salado River (Buenos Aires, Argentina) for 10 years (1995-2005) and detected significant changes occurring in chlorophyte abundance and species richness during La Niña event (1998-1999), which period was analyzed throughout the entire basin (main stream and tributaries). We compared the physicochemical and biologic variables between two El Niño-La Niña-Southern Oscillation (ENSO) periods - El Niño (March 1997-January 1998) and La Niña (May 1998-May 1999) - to identify possible indicators of a relationship between climatic anomalies and chlorophyte performance. Chlorophyte density increased during the La Niña. Under normal or extreme hydrologic conditions, mobile (Chlamydomonas spp.) and nonmobile (Monoraphidium spp.) chlorophytes codominated. These species belonged to Reynolds's functional groups X1 and X2, those typical of nutrient-enriched environments. Comparative analyses between El Niño and La Niña periods indicated significant differences in physicochemical (K+, dissolved polyphenols, particulate reactive phosphorus, alkalinity, pH) and biologic (species diversity and richness, phytoplankton and chlorophyte total densities) variables between the two periods at all basin sites. During the La Niña condition, species richness was greater owing to interconnected shallow lakes and drainage-channel inputs, while the Shannon diversity index was lower because of the high abundance values of Monoraphidium minutum. A detailed analysis of the chlorophytes in the entire basin, indicated that changes in density and species dominance occurred on a regional scale although diverse chlorophyte assemblages were identified in the different sectors of the Salado River basin. After La Niña event, the entire basin had the potential to revert to the previous density values, showing the resilience to global environmental changes and the ability to reestablish the general conditions of stability.
format Articulo
Articulo
author Solari, Lía Cristina
Gabellone, Néstor Adrián
Claps, María Cristina
Casco, María Adela
Quaíni, Karina Paola
Neschuk, Nancy Carolina
author_facet Solari, Lía Cristina
Gabellone, Néstor Adrián
Claps, María Cristina
Casco, María Adela
Quaíni, Karina Paola
Neschuk, Nancy Carolina
author_sort Solari, Lía Cristina
title Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
title_short Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
title_full Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
title_fullStr Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
title_full_unstemmed Phytoplankton chlorophyte structure as related to ENSO events in a saline lowland river (Salado River, Buenos Aires, Argentina)
title_sort phytoplankton chlorophyte structure as related to enso events in a saline lowland river (salado river, buenos aires, argentina)
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85163
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