La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Macrophyte functional variables versus species assemblages as predictors of trophic status in flowing waters
Auteurs :	M. M. Ali, Auteur ; K. J. Murphy, Auteur ; V. J. Abernethy, Auteur
Type de document :	Article
Dans :	Hydrobiologia (415 NOV 1999)
Article en page(s) :	131-138
Résumé :	A series of models was developed using functionally-derived variables (mainly based on morphological attributes of freshwater macrophytes) to predict the trophic status of river and associated channel systems. The models were compared with an existing species-assemblage based procedure for predicting British river trophic conditions (the Macrophyte Trophic Ranking scheme, MTR). We compared sites in cooler temperate conditions (in Scotland) and warmer, sub-tropical conditions (in Egypt). In total, we made measurements of 13 traits from > 600 individual plant specimens of 33 species growing at 42 sites (divided into independent input and test site datasets). N status (as annual mean concentration in water of total oxidised nitrogen, TON) was only very poorly predicted by this approach. However, P (as annual mean concentration in water of soluble reactive phosphate, SRP) was better predicted: both by a model based on MTR (r = -0.585, p

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