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Published online 26th September 2007 in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/aqc866

Page 3, line 1 of the article should read Iberian Chub, not Iberian Chu as published.

The Authors would also like to include the following sentence into the Acknowledgements section:

This work was carried out as a post-doctoral study funded by the Fundação de Ciência e tecnologia.