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AOBPreview originally published online on October 28, 2004
Annals of Botany 2004 94(6):865-874; doi:10.1093/aob/mch214
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Annals of Botany 94/6, © Annals of Botany Company 2004; all rights reserved

Phytolith Assemblages in Grasses Native to Central Argentina

LUCRECIA GALLEGO and ROBERTO A. DISTEL*

Departamento de Agronomía, Universidad Nacional del Sur and CERZOS, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, San Andrés 800, 8000 – Bahía Blanca, Argentina

* For correspondence. E-mail cedistel{at}criba.edu.ar

Received: 16 April 2004    Returned for revision: 11 June 2004    Accepted: 24 August 2004    Published electronically: 28 October 2004

• Background and Aims Phytolith reference collections are a prerequisite for accurate interpretation of soil phytolith assemblages aimed at reconstructing past vegetation. In this study a phytolith reference collection has been developed for several grasses native to central Argentina: Poa ligularis, Piptochaetium napostaense, Stipa clarazii, Stipa tenuis, Stipa tenuissima, Stipa eriostachya, Stipa ambigua, Stipa brachychaeta, Pappophorum subbulbosum, Digitaria californica, Bothriochloa edwardsiana and Aristida subulata.

• Methods For each species, phytoliths present in the leaf blades were classified into 47 morphotypes, and their relative frequency determined by observing 300–400 phytoliths per sample (n = 5). Data were analyzed by complete linkage cluster analysis, using the Morisita Index as measure of association.

• Key Results The results showed differentiation among phytolith assemblages at species level or at plant functional type level. Cluster analysis separated C3 from C4 species and palatable from non-palatable species.

• Conclusions This study highlights the possibility of reconstructing past vegetation in central Argentina grasslands through the analysis of soil phytolith assemblages.

Key words: Poaceae, native grasses, Argentina, phytolith assemblages, grass phytoliths


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