Abstract
The coastal zone of the inner Thermaikos Gulf has been influenced by eutrophication during the past decades. The conditions of the catchment area-coastal zone continuum are assessed under the holistic Driver-Pressure-State-Impact-Response (DPSIR) framework. Major socioeconomic drivers, such as industrial and agricultural development as well as urbanization, exert substantial environmental pressures on the Axios River and the Thermaikos Gulf. The Thermaikos Gulf is a highly complex system, being affected by nutrient inputs from four rivers and the City of Thessaloniki. Moreover, the Axios River which is the most significant contributor of freshwater and nutrients to the gulf, is a transboundary river shared between Greece and the Former Yugoslav Republic of Macedonia (FYROM). The two countries have not yet established a mutual management plan to control freshwater and nutrient discharges. Long-term analysis has shown that presently, more than 11,800 t of nitrogen and 3,400 t of phosphorous are released annually into the marine system. In the Antropocene era, and particularly during the past 20 years, freshwater discharges have decreased and riverine nutrients have increased, whereas inputs from domestic and industrial effluents have a decreasing trend. However, nutrient over-enrichment impacts, i.e. eutrophication, harmful algal blooms and hypoxia still have to be addressed in order to identify whether the coastal system is recovering, or whether further actions should be undertaken to control nutrient inputs from the Axios River and/or other sources. Response actions, such as the improvement of Thessaloniki’s wastewater treatment plant, have proved to play a positive role in the reduction of domestic wastewater input in the gulf, whereas similar facilities are completely lacking in FYROM. On the other hand, several parts of the Axios River delta are designated as protected areas, in an effort to protect environmentally rich habitats. These efforts are often disputed by local stakeholders, which have conflicting interests in the use of the hinterland and the coastal environment. The need of an integrated catchment-coastal zone management plan appears as a fundamental priority in order to protect, improve and maintain the environment, taking into account the need for economic development of the area. The DPSIR conceptual framework appears to be a valuable tool, as it enables parallel assessment of socioeconomic and environmental issues. In combination with the application of numerical models, the DPSIR analysis may provide suggestions for sustainable and environmentally-friendly measures to policy makers.
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Acknowledgements
This research was performed under the auspices of the project EUROCAT (European catchments. Catchment changes and their impact on the coast; http://www.iia-cnr.unical.it/EUROCAT/project.htm). Funding from the EU (contract number ENV1–2000–00044) for the EUROCAT project is gratefully acknowledged. Moreover, the Metro-Med project (Dynamics of Matter Transfer and Biogeochemical Cycles: Their Modeling in Coastal Systems of the Mediterranean Sea, contract MAS3-CT96–0049), provided background information on river and Thermaikos Gulf data. We thank S.E. Poulos and an anonymous reviewer for valuable comments and suggestions.
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Karageorgis, A.P., Skourtos, M.S., Kapsimalis, V. et al. An integrated approach to watershed management within the DPSIR framework: Axios River catchment and Thermaikos Gulf. Reg Environ Change 5, 138–160 (2005). https://doi.org/10.1007/s10113-004-0078-7
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DOI: https://doi.org/10.1007/s10113-004-0078-7