A multiproxy approach to inferring Holocene paleobotanical changes linked to sea-level variation, paleosalinity levels, and shallow lake alternative states in Negra Lagoon, SE Uruguay.

Dublin Core

Título

A multiproxy approach to inferring Holocene paleobotanical changes linked to sea-level variation, paleosalinity levels, and shallow lake alternative states in Negra Lagoon, SE Uruguay.

Tema

PALEOBOTANICA
SALINIDAD
HOLOCENO
LAGUNA NEGRA - URUGUAY
PALEOLIMNOLOGIA
NIVEL DEL MAR
DIATOMEAS
CHRYSOPHYTAS
URUGUAY
BIBLIOGRAFÍA NACIONAL QUÍMICA
2010

Abstract

A multiproxy analysis of diatoms, chrysophyte cysts, opal phytoliths, and palynomorphs was undertaken in Negra Lagoon, to decipher Holocene changes in paleobotanical proxies associated with sea-level changes and paleolimnological conditions. Before the Holocene transgression (7000 yr BP), a terrestrial system was inferred as no aquatic palynomorphs or biogenic silica remains were recorded. During the sea-level maximum (5200 yr BP), marine/ brackish conditions were established as indicated by diatoms, Chenopodiaceae, and a high content of cysts of Peridinioideae. The catchment consisted of grasslands and wetlands as indicated by the opal phytolith data. The Holocene transgression was followed by a sea-level decrease, which led to the onset of brackish/freshwater conditions as inferred from the co-dominance of freshwater and marine/ brackish diatoms. This is also supported not only by the concomitant increase in non-siliceous freshwater microalgae and emergent macrophytes, but also by the presence of Myriophyllum. As sea level continued to decrease during late Holocene, a freshwater system was observed because of the complete separation from the ocean. Chrysophyte cysts were consistently recorded and brackish diatoms exhibited reduced abundances. The observed limnological changes are consistent with the alternative states hypothesis of Scheffer’s model (1998). That is, the clear water phases were explained because of high macrophyte abundances, low phytoplankton frequencies, high cyst to diatom ratios, and increase in frequencies of benthic diatom species. Conversely, turbid phases were likely to occur when low cyst to diatom ratios together with increase in planktonic diatoms and decrease in macrophytes values were detected. This highlights the importance of this approach to detect long-term changes in shallow lake alternative states.

Autor

García-Rodríguez, Felipe
Inda Ferrero, Hugo Rodolfo
Del Puerto García, Laura
Bracco Boksar, Roberto
Panario, Daniel

Fuente

Hydrobiologia v. 646, no. 1, 2010. -- p. 5-20

Editor

Springer

Fecha

2010

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Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

DOI 10.1007/s10750-010-0184-0

Cobertura

Uruguay

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Original Format

PDF
Fecha de agregación
December 10, 2014
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
García-Rodríguez, Felipe, “A multiproxy approach to inferring Holocene paleobotanical changes linked to sea-level variation, paleosalinity levels, and shallow lake alternative states in Negra Lagoon, SE Uruguay.,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed November 13, 2019, http://riquim.fq.edu.uy/items/show/2211.
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