Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía

The aquatic ecosystems of the Pampean plains usually have highly variable dynamics which affects the abundance of fish resources. We analyzed Blanca Chica shallow lake located in the central region of the province of Buenos Aires. It has neither tributaries nor effluents. It hosts sport fishing, wat...

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Detalles Bibliográficos
Autores principales: Sanzano, Pablo, Grosman, Fabián, Colasurdo, Viviana
Formato: Articulo
Lenguaje:Español
Publicado: 2014
Materias:
Ciencias Naturales
Lagunas
Ecosistema
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/56930
http://www.bacuatica.org/index.php/bacuatica/article/view/33
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-56930
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Naturales
Lagunas
Ecosistema
spellingShingle Ciencias Naturales
Lagunas
Ecosistema
Sanzano, Pablo
Grosman, Fabián
Colasurdo, Viviana
Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
topic_facet Ciencias Naturales
Lagunas
Ecosistema
description The aquatic ecosystems of the Pampean plains usually have highly variable dynamics which affects the abundance of fish resources. We analyzed Blanca Chica shallow lake located in the central region of the province of Buenos Aires. It has neither tributaries nor effluents. It hosts sport fishing, water sports without engine, and its surroundings are used for recreation. Here we report the effects of drought in the structure and functioning of the shallow lake, with emphasis on the fish community. Limnological and ichthyologic analyses were carried out in 2007, 2008, 2011 (year characterized by extreme regional dry period) and 2014. In 2007 the phytoplankton was dominated by Botryococcus braunii. Pejerrey (Odontesthes bonariensis) was dominant in the fish samples, but showing an important decrease in numbers and biomass. Catch per unit effort (CPUE) was low and showed poor fish quality with high taeniasis. In 2008, zooplankton improved both in quality and quantity and became the basis of pejerrey`s diet, which effectively increased its abundance and its biomass, with fish in the 1- and 2-year class. In 2011 the conductivity, chlorophyll-a, chlorides, sodium, ammonium and sulfates were one order of magnitude above historical values. The extreme limnological conditions and notorious area reduction triggered a total absence of fish. The 2014 campaign showed that the shallow lake level had increased from 1,5 to 2 m. However, no fish were detected; the absence may be explained by the lake’s isolation and natural massive mortality occurred.
format Articulo
Articulo
author Sanzano, Pablo
Grosman, Fabián
Colasurdo, Viviana
author_facet Sanzano, Pablo
Grosman, Fabián
Colasurdo, Viviana
author_sort Sanzano, Pablo
title Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
title_short Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
title_full Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
title_fullStr Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
title_full_unstemmed Estudio limnológico de Laguna Blanca Chica (Olavarría, provincia de Buenos Aires) durante un período de sequía
title_sort estudio limnológico de laguna blanca chica (olavarría, provincia de buenos aires) durante un período de sequía
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/56930
http://www.bacuatica.org/index.php/bacuatica/article/view/33
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AT grosmanfabian estudiolimnologicodelagunablancachicaolavarriaprovinciadebuenosairesduranteunperiododesequia
AT colasurdoviviana estudiolimnologicodelagunablancachicaolavarriaprovinciadebuenosairesduranteunperiododesequia
bdutipo_str Repositorios
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