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dc.contributor.author
Plastani, María Sofía  
dc.contributor.author
Laprida, Cecilia  
dc.contributor.author
Montes de Oca, Fernanda  
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Massaferro, Julieta  
dc.contributor.author
Panarello, Hector Osvaldo  
dc.contributor.author
Ramón Mercau, María Josefina  
dc.contributor.author
Lami, Andrea  
dc.date.available
2020-02-13T21:39:32Z  
dc.date.issued
2019-01  
dc.identifier.citation
Plastani, María Sofía; Laprida, Cecilia; Montes de Oca, Fernanda; Massaferro, Julieta; Panarello, Hector Osvaldo; et al.; Recent environmental changes inferred from sediments in a shallow lake of the Argentinian pampas; Springer; Journal Of Paleolimnology; 61; 1; 1-2019; 37-52  
dc.identifier.issn
0921-2728  
dc.identifier.uri
http://hdl.handle.net/11336/97516  
dc.description.abstract
The Pampas are fertile lowland plains that extend across east-central Argentina and are renowned for their agricultural importance. The low geomorphologic relief of the region accounts for the occurrence of numerous shallow lakes whose sediments constitute paleoenvironmental archives of the outcomes of natural processes and human activities in the Pampas. We identified the main forcing factors behind hydrological shifts during the past ca. 200 years in La Barrancosa, a shallow lake located in the southeastern Pampas. The data provide a historical context to better understand environmental changes in the area during the twentieth century. Variations in biological (ostracods, chironomids and pigments), geochemical and sedimentological variables were interpreted in terms of lake level and trophic state changes. The low diversity of biological assemblages and the autoecology of the ostracod and chironomid taxa suggest that during parts of the record assigned to the nineteenth century, near the end of the Little Ice Age, La Barrancosa was a shallow, ephemeral, subsaline wetland, indicating drier-than-present conditions. Thereafter, a hiatus from ca. AD 1860–1940 is attributed to denudation processes during the Pampas Dust Bowl drought of the 1930s. The onset of wetter conditions around 1940 brought higher lake levels and establishment of a perennial shallow lake, inferred mostly from shifts in sedimentological and geochemical variables. Marked variations in fossil pigments and in ostracod and chironomid assemblages reveal that the basin shifted from being endorheic to arheic around 1970, in spite of increased precipitation, forced by changes in global circulation patterns. This shift coincided with an inferred increase in primary production and was coeval with profound land use changes and technological innovations in the region. Further changes in sedimentological, geochemical and biological variables indicate that eutrophication accelerated from 1990 onwards, most likely as a consequence of the increase in planted area around the lake, massive application of fertilizer, and cultivation of pesticide-intensive transgenic soybeans. This study provides an historical perspective into ongoing environmental deterioration of shallow lakes in the Argentinian Pampas.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Springer  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
ENVIRONMENTAL CHANGE  
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PALEOLIMNOLOGY  
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PAMPEAN PLAINS  
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SHALLOW LAKES  
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TWENTIETH CENTURY  
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Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Recent environmental changes inferred from sediments in a shallow lake of the Argentinian pampas  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2020-01-06T17:03:56Z  
dc.journal.volume
61  
dc.journal.number
1  
dc.journal.pagination
37-52  
dc.journal.pais
Alemania  
dc.journal.ciudad
Berlín  
dc.description.fil
Fil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Laprida, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Montes de Oca, Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Administración de Parques Nacionales; Argentina  
dc.description.fil
Fil: Massaferro, Julieta. Administración de Parques Nacionales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Panarello, Hector Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotópica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; Argentina  
dc.description.fil
Fil: Ramón Mercau, María Josefina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Lami, Andrea. Consiglio Nazionale delle Ricerche; Italia  
dc.journal.title
Journal Of Paleolimnology  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10933-018-0043-y  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10933-018-0043-y