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Coastal dune vegetation and pollen representation in south Buenos Aires Province, Argentina
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
In: Journal of BoigeographyArticle in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-91370OAI: oai:DiVA.org:uu-91370DiVA: diva2:164079
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved
In thesis
1. Present and Past Coastal Dune Environments of South Buenos Aires Province, Argentina
Open this publication in new window or tab >>Present and Past Coastal Dune Environments of South Buenos Aires Province, Argentina
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. 38 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 940
Quaternary geology, pollen, ostracods, dune vegetation, Holocene, Buenos Aires Province, Argentina, Kvartärgeologi
National Category
urn:nbn:se:uu:diva-4000 (URN)91-554-5876-9 (ISBN)
Public defence
2004-02-20, Axel Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Available from: 2004-01-30 Created: 2004-01-30Bibliographically approved

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