La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A Simple Index of Trophic Status in Estuaries and Coastal Bays Based on Measurements of pH and Dissolved Oxygen
Auteurs :	Shane O'Boyle, Auteur ; Georgina McDermott, Auteur ; Tone Noklegaard, Auteur ; Robert Wilkes, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(1) JAN 2013)
Article en page(s) :	158-173
Résumé :	Measurements of pH and dissolved oxygen saturation in summer from 90 Irish estuaries and coastal bays were used to develop a simple index of trophic state. The index is based on the assumption that large fluctuations in both these variables are likely to be a characteristic feature of eutrophication. In this paper, we use a simple index to capture the relative variation in both pH and dissolved oxygen saturation in each water body during a period of 3 years. We show that the index is in good agreement with other trophic status schemes and strongly correlated with parameters indicative of trophic state such as chlorophyll a and biochemical oxygen demand. We conclude that the index could be used as a simple screening tool to group individual water bodies into broad categories that reflect their trophic state.

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