Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes

We investigated carbon isotopic ratios (δ<sup>13</sup>C) v. carbon to nitrogen (C : N) ratios for surface sediments throughout a large estuarine system (Rio de la Plata, RdlP), combined with sediment cores from adjacent marshes to infer main carbon sources. We also evaluated the influenc...

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Detalles Bibliográficos
Autores principales: Bergamino, Leandro, Schuerch, Mark, Tudurí, Adriana, Carretero, Silvina Claudia, García Rodríguez, Felipe
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Carbon isotopes
C/N ratios
marsh
estuarine sediments
Río de la Plata
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124266
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124266
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
Carbon isotopes
C/N ratios
marsh
estuarine sediments
Río de la Plata
spellingShingle Ciencias Naturales
Carbon isotopes
C/N ratios
marsh
estuarine sediments
Río de la Plata
Bergamino, Leandro
Schuerch, Mark
Tudurí, Adriana
Carretero, Silvina Claudia
García Rodríguez, Felipe
Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
topic_facet Ciencias Naturales
Carbon isotopes
C/N ratios
marsh
estuarine sediments
Río de la Plata
description We investigated carbon isotopic ratios (δ<sup>13</sup>C) v. carbon to nitrogen (C : N) ratios for surface sediments throughout a large estuarine system (Rio de la Plata, RdlP), combined with sediment cores from adjacent marshes to infer main carbon sources. We also evaluated the influence of the El Nino–Southern Oscillation (ENSO) and associated high freshwater-discharge events on the organic-matter transport within the estuary. The isotopic pattern in surface sediments of the RdlP showed the upper reaches to be influenced by riverine particulate matter (δ<sup>13</sup>C range: –24 to –26‰). Similarly, in the sediment cores from marshes of the upper reaches, δ<sup>13</sup>C values decreased from –24‰ in ancient sediments to –28‰ in recent sediments, reflecting an increased contribution of organic matter from land, including C3 plants and freshwater phytoplankton, during the past 50 years. However, the lower reaches represent a depositional environment of marine algae (δ<sup>13</sup>C range: –21 to –23‰), with no influence of detritus from adjacent marshes, indicating minor erosion of the marshes in the lower reaches operating as carbon-sink habitats. Our isotopic analysis showed that the transport and deposition of terrigenous organic matter within the RdlP and adjacent marsh habitat appear to be both temporally and spatially linked to hydrology patterns.
format Articulo
Preprint
author Bergamino, Leandro
Schuerch, Mark
Tudurí, Adriana
Carretero, Silvina Claudia
García Rodríguez, Felipe
author_facet Bergamino, Leandro
Schuerch, Mark
Tudurí, Adriana
Carretero, Silvina Claudia
García Rodríguez, Felipe
author_sort Bergamino, Leandro
title Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
title_short Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
title_full Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
title_fullStr Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
title_full_unstemmed Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes
title_sort linking patterns of freshwater discharge and sources of organic matter within the río de la plata estuary and adjacent marshes
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/124266
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