Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/13100
Title: Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
Authors: Lillebø, A. I. 
Teixeira, H. 
Pardal, M. A. 
Marques, J. C. 
Keywords: Eutrophication; Transitional waters; Quality status; Estuary
Issue Date: Mar-2007
Publisher: Elsevier Ltd.
Citation: Estuarine, Coastal and Shelf Science. 72:1-2 (2007) 177-187
Serial title, monograph or event: Estuarine, Coastal and Shelf Science
Issue: 1-2
Abstract: The Mondego estuary is a well-described polyhaline type of transitional water located at the North Atlantic Ocean Ecoregion, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to huge productivity of Ulva spp. Zostera noltii meadows were severely reduced causing the whole ecosystem to become impoverished in terms of macrofaunal abundance, biomass and species richness with a concomitant lowering of secondary production. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient rich freshwater inflow, to reverse the process in the most affected area of the estuary – its south arm. Thus, the system quality status was assessed before and after 1998, over a ten year period. The OSPAR comprehensive procedure, the first phase of the US-NEEA procedure and the proposed EU-WFD physicochemical status criteria were applied to the data before and after the modifications and all show that the system health has improved. Nonetheless, the annual means of the oxidised forms of nitrogen and of phosphate were not reduced. In fact, applying criteria used in classifying the nutrient levels in transitional waters and the Baltic sea trophic condition, the system has not improved. Meaning that, to look forward to a “higher” quality status, future measures should also consider longer term solutions such as improved agriculture practices in the Mondego River valley through environmental friendly technological solutions that will reduce the nutrient loads to this system
URI: http://hdl.handle.net/10316/13100
ISSN: 0272-7714
DOI: 10.1016/j.ecss.2006.10.012
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
Applying quality status criteria.pdf604.7 kBAdobe PDFView/Open
Show full item record

Page view(s) 20

557
checked on Oct 16, 2019

Download(s)

45
checked on Oct 16, 2019

Google ScholarTM

Check

Altmetric

Dimensions


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.