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Present and Past Coastal Dune Environments of South Buenos Aires Province, Argentina
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this thesis is to describe present and past coastal dune environments in southern Buenos Aires Province, Argentina.

The present vegetation of a dune system and its zonation are described on the basis of air photographs, physiognomy of the dune system and floristic composition. The vegetation was characterized by a large number of Poaceae and Asteraceae species. Five vegetation zones, based on floristic composition, were defined by cluster analysis.

Pollen-vegetation comparison revealed that pollen assemblages differed considerably from the associated vegetation. Some of the major discrepancies were caused by large differences between pollen and vegetation proportion of Hyalis argentea and Discaria americana. However, the local vegetation was well represented in recent soil samples. Pollen traps recorded predominantly extralocal and regional pollen.

A new species of ostracods was recovered from an interdunal lake. The species, a giant cypridid, was described and illustrated, and its geographical distribution and ecology were discussed.

Two sediment sequences from the coastal intertidal zone and from a shallow freshwater lake were analysed for loss on ignition, calcareous microfossils (ostracods and foraminifers), macro remains and pollen. The coastal sequence was deposited between 7890 and 7630 cal. BP. Its pollen assemblages were typical for halophytic associations, with some psammophytic taxa also present in recent vegetation. The microfossils were representative of a littoral lagoon. The lake sequence comprised the last 3000 cal. BP. Pollen spectra indicated a relatively stable vegetation composition after the lake had been formed. Pollen assemblages reflected the present regional grassland vegetation with taxa characteristic for the surrounding dune communities. Human settlement was indicated in the pollen spectra by the presence of introduced taxa in the uppermost samples.

The data presented provide a useful reference for the interpretation of fossil sequences from similar environments.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 38
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 940
Keywords [en]
Quaternary geology, pollen, ostracods, dune vegetation, Holocene, Buenos Aires Province, Argentina
Keywords [sv]
Kvartärgeologi
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-4000ISBN: 91-554-5876-9 (print)OAI: oai:DiVA.org:uu-4000DiVA, id: diva2:164082
Public defence
2004-02-20, Axel Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Opponent
Supervisors
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved
List of papers
1. Pollen deposition in coastal dunes, south Buenos Aires Province, Argentina
Open this publication in new window or tab >>Pollen deposition in coastal dunes, south Buenos Aires Province, Argentina
2003 In: Review of Palaeobotany and Palynology, Vol. 126, no 1-2, p. 17-37Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91369 (URN)
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved
2. Coastal dune vegetation and pollen representation in south Buenos Aires Province, Argentina
Open this publication in new window or tab >>Coastal dune vegetation and pollen representation in south Buenos Aires Province, Argentina
In: Journal of BoigeographyArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91370 (URN)
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved
3. A new giant cypridid ostracod (Crustacea) from southern Buenos Aires Province, Argentina
Open this publication in new window or tab >>A new giant cypridid ostracod (Crustacea) from southern Buenos Aires Province, Argentina
In: HydrobiologiaArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91371 (URN)
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved
4. Holocene vegetation history and palaeoenvironmental conditions on the temperate Atlantic coast of Argentina, as inferred from multi-proxy lacustrine records
Open this publication in new window or tab >>Holocene vegetation history and palaeoenvironmental conditions on the temperate Atlantic coast of Argentina, as inferred from multi-proxy lacustrine records
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91372 (URN)
Available from: 2004-01-30 Created: 2004-01-30 Last updated: 2010-01-13Bibliographically approved

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