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Morpho-chronological variations and primary production in Posidonia sea grass from Western Australia

Published online by Cambridge University Press:  12 October 2004

Gérard Pergent
Affiliation:
Equipe Ecosystèmes Littoraux, Faculty of Sciences, University of Corsica, BP 52, 20250 Corte, France
Christine Pergent-Martini
Affiliation:
Equipe Ecosystèmes Littoraux, Faculty of Sciences, University of Corsica, BP 52, 20250 Corte, France
Catherine Fernandez
Affiliation:
Equipe Ecosystèmes Littoraux, Faculty of Sciences, University of Corsica, BP 52, 20250 Corte, France
Vanina Pasqualini
Affiliation:
Equipe Ecosystèmes Littoraux, Faculty of Sciences, University of Corsica, BP 52, 20250 Corte, France
Diana Walker
Affiliation:
Department of Botany, University of Western Australia, Nedlands, Perth, 6907, Western Australia

Abstract

The occurrence of morpho-chronological variations was demonstrated in three Australian species of phanerogams, Posidonia australis, Posidonia coriacea and Posidonia sinuosa, which are found living around Rottnest Island (Western Australia). Three chronological parameters were identified: the thickness of dead sheaths, the internodal distance and the regular presence of floral stalk remains. The foliar primary production for these three species, as estimated using the lepidochronology method, is very high since values of 1374, 1811 and 678 mg dw shoot−1 y−1 were recorded, respectively. Rhizome production values range from 70·6 and 376·7 mg dw shoot−1 y−1 for Posidonia coriacea and Posidonia australis respectively. The results obtained are very encouraging and confirm that these morpho-chronological variations are particularly well developed for the genus Posidonia.

Type
Research Article
Copyright
2004 Marine Biological Association of the United Kingdom

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