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Abstract:

The aim of this study was to assess the potential of diatoms and mollusks as paleoenvironmental indicators in semiarid lakes of the Argentinean Pampas. At each lake, physical and chemical variables were quantified, and diatoms and mollusks collected. The relationships between environmental variables and biological assemblages were explored through ordination techniques. Lakes were highly alkaline (pH 9.5-10.5), and varied significantly in conductivity (0.2-15.7mS/cm) and hardness (120-1874mg/l CaCO 3). A total of 79 diatom and two mollusk species were identified. The highest percentage variance in diatom data was explained by hardness, conductivity, and mud percentage. Mollusk variability was significantly related to conductivity, hardness, and vegetation cover. Diatom-based ordination of sites accurately reflected the main environmental gradients characteristic of the region, while the resolution provided by mollusk-based ordinations was lower, mainly as consequence of the wide ranges of tolerance to hardness and conductivity exhibited by the two species represented. Hence, while the use of mollusks as paleoenvironmental indicators is only valid at a large, regional scale, diatoms allow discriminating local conditions and subtle environmental differences. As a consequence, the results emphasize the use of mollusks as qualitative and semi-quantitative indicators, while the strong statistical relationship between diatoms and climate-driven environmental parameters highlights their potential use as quantitative indicators of Quaternary climatic changes in the semiarid Pampas. © 2011 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance
Autor:Hassan, G.S.; De Francesco, C.G.; Peretti, V.
Filiación:Grupo de Ecología y Paleoecología de Ambientes Acuáticos Continentales, Instituto de Investigaciones Marinas y Costeras, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Juan B. Justo 2550, 7600 Mar del Plata, Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Uruguay 151, 6300 Santa Rosa, Argentina
Departamento de Inspección de Espacios Verdes, Secretaría de Desarrollo Urbano, Municipalidad de Rio Cuarto, Pje. Cabildo de la Concepción 651, 5800 Rio Cuarto, Córdoba, Argentina
Idioma: Inglés
Palabras clave:Conductivity; Hardness; Ordination techniques; Paleoenvironmental bioindicators; South American Arid Diagonal; bioindicator; conductivity; diatom; lake ecosystem; mollusc; ordination; paleoenvironment; qualitative analysis; Quaternary; semiarid region; shallow water; Argentina; Pampas
Año:2012
Volumen:78
Página de inicio:65
Página de fin:72
DOI: http://dx.doi.org/10.1016/j.jaridenv.2011.11.002
Título revista:Journal of Arid Environments
Título revista abreviado:J. Arid Environ.
ISSN:01401963
CODEN:JAEND
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01401963_v78_n_p65_Hassan

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Citas:

---------- APA ----------
Hassan, G.S., De Francesco, C.G. & Peretti, V. (2012) . Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance. Journal of Arid Environments, 78, 65-72.
http://dx.doi.org/10.1016/j.jaridenv.2011.11.002
---------- CHICAGO ----------
Hassan, G.S., De Francesco, C.G., Peretti, V. "Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance" . Journal of Arid Environments 78 (2012) : 65-72.
http://dx.doi.org/10.1016/j.jaridenv.2011.11.002
---------- MLA ----------
Hassan, G.S., De Francesco, C.G., Peretti, V. "Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance" . Journal of Arid Environments, vol. 78, 2012, pp. 65-72.
http://dx.doi.org/10.1016/j.jaridenv.2011.11.002
---------- VANCOUVER ----------
Hassan, G.S., De Francesco, C.G., Peretti, V. Distribution of diatoms and mollusks in shallow lakes from the semiarid Pampa region, Argentina: Their relative paleoenvironmental significance. J. Arid Environ. 2012;78:65-72.
http://dx.doi.org/10.1016/j.jaridenv.2011.11.002