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Cited by 49

The DOI matches its Crossref record; 56 of the 56 references it cites were found in a registry or an index.

Late Holocene climate and environment of the SE Pampa grasslands, Argentina, inferred from biological indicators in shallow, freshwater Lake Nahuel Rucá

Stutz, Silvina, Borel, C. Marcela, Fontana, Sonia L., del Puerto, Laura, Inda, Hugo, García-Rodriguez, Felipe, Tonello, Marcela S.·2010·Journal of Paleolimnology
DOI 10.1007/s10933-010-9450-4
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Abstract

We analyzed pollen, non-pollen palynomorphs (NPPs), calcareous microfossils, plant macrofossils, diatoms, chrysophyte cysts, opal phytoliths and organic matter content in a 123-cm sediment sequence from Nahuel Rucá Lake, a shallow, freshwater system in the southeastern Pampa grasslands, Argentina. Three stages in the lake evolution were identified. Before 3,680 cal year BP, only pollen, NPPs (dinoflagellate cysts and acritarchs) and ostracods were recovered, suggesting brackish/saline conditions in the lake and nearby areas. Freshwater conditions are, however, indicated by Myriophyllum , Pediastrum and Zygnemataceae. The brackish/saline conditions could have been caused by marine influence during a Holocene sea level high stand that affected the area ca. 6,000 year BP. Between 3,680 and 390 cal year BP, macrophyte pollen and plant macrofossils indicate increasingly freshwater conditions in the lake and the adjacent area. Diatom and ostracod assemblages, however, suggest brackish and oligotrophic conditions, giving way to freshwater and meso-eutrophic conditions toward the end of this period. The relationship between submersed macrophytes ( Myriophyllum , Potamogeton , Ceratophyllum , Chara ) and planktonic algae (Chlorophyta and diatoms), suggests a shift in the lake from a clear to a turbid state. This turbid state is more evident after 390 cal year BP. High values of Pediastrum , Scenedesmus and diatoms ( Cyclotella meneghiniana , Aulacoseira granulata , A. muzzanensis ) observed during this stage could have reduced light penetration, with consequent loss of submersed plants. Pollen and plant macrofossils in the uppermost 20 cm indicate a shallow, freshwater lake similar to present, though an increase in brackish/freshwater diatoms suggests an increase in salinity, perhaps related to periodic droughts. Opal phytoliths yield a regional paleoclimatic reconstruction that agrees closely with inferences made using pollen, mammals and sediment characteristics.

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Crossref · 10.1007/s10933-010-9450-4

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Figures

Fig. 1 a Location of study area. b General overview of the Mar Chiquita coastal lagoon area and location of Lakes Nahuel Ruca ´ and Hinojales. Asterisk Sampling point. LNT LandSat7 (False Color). Source : World Wind 1.4 http://worldwind.arc. nasa.gov/
Fig. 1 a Location of study area. b General overview of the Mar Chiquita coastal lagoon area and location of Lakes Nahuel Ruca ´ and Hinojales. Asterisk Sampling point. LNT LandSat7 (False Color). Source : World Wind 1.4 http://worldwind.arc. nasa.gov/CC-BY-NC · From the PDF
Fig. 2 Pollen and non-pollen palynomorph percentages and organic matter content (%) from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using CONISS
Fig. 2 Pollen and non-pollen palynomorph percentages and organic matter content (%) from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using CONISSCC-BY-NC · From the PDF
Fig. 3 Abundance of calcareous microfossils (ostracods and foraminifera) and macro remains from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using
Fig. 3 Abundance of calcareous microfossils (ostracods and foraminifera) and macro remains from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined usingCC-BY-NC · From the PDF
Fig. 4 Diatom percentages from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using cluster analysis. The Morisita Index was used to assess the strength of the association among diatom assemblages
Fig. 4 Diatom percentages from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using cluster analysis. The Morisita Index was used to assess the strength of the association among diatom assemblagesCC-BY-NC · From the PDF
Fig. 5 Phytolith percentages from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using cluster analysis. The Morisita Index was used to assess the strength of the association among phytolith assemblages
Fig. 5 Phytolith percentages from Nahuel Ruca ´ Lake, including chronology and lithology. Zones were defined using cluster analysis. The Morisita Index was used to assess the strength of the association among phytolith assemblagesCC-BY-NC · From the PDF

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Citations

Cites

Research works printed but not linked: 6

  1. del Puerto L (2009) Silicofitolitos como Indicadores Paleoambientales: bases comparativas y reconstrucción paleoclimática a partir del Pleistoceno Tardío en el SE del Uruguay. Mg Thesis PEDECIBA, Facultad de Ciencias, Universidad de la República, Montevideo, 189 pp (unpublished)
  2. Frenguelli J (1941) Diatomeas del Río de la Plata. Rev Mus Nac La Plata Tomo 3:213–334
  3. Frenguelli J (1945) Las diatomeas del Platense. Rev Mus Nac La Plata Tomo 3:77–221
  4. Stutz S, Prieto AR, Isla FI (1999) Cambios de la vegetación durante el Holoceno en el SE bonaerense: análisis polínico del paleoestuario del arroyo La Ballenera. APA Pub Especial 6:65–69
  5. Violante RA (1992) Ambientes sedimentarios asociados a un sistema de barrera litoral del Holoceno en la llanura costera al sur de Villa Gesell, Provincia de Buenos Aires. RAGA 47:201–214
  6. Violante RA, Parker G, Cavallotto JL (2001) Evolución de las llanuras costeras del este bonaerense entre la bahía Samborombón y la laguna Mar Chiquita durante el Holoceno. RAGA 56:51–66

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Metadata

Authors
Stutz, S., Borel, C. M., Fontana, S. L., del Puerto, L., Inda, H., García-Rodriguez, F., & Tonello, M. S.
Venue
Journal of Paleolimnology
Publisher
Springer Science and Business Media LLC
Published
2010-06-30
Volume
44
Issue
3
Pages
761-775
ISSN
  • 0921-2728
  • 1573-0417
DOI
10.1007/s10933-010-9450-4
Cited by
49
References
56
Language
en

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