Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.

High riverine nutrient loads caused poor water quality, low water transparency and an unsatisfactory ecological status in the Szczecin (Oder) Lagoon, a trans-boundary water at the southern shore of the Baltic Sea. Total annual riverine N (P) loads into the lagoon raised at the 20th century from approximately 14,000 t TN (1,000 t TP) to 115,000 t TN (10,500 t TP) in the 1980ties and declined to about 56,750 t TN (2,800 t TP) after 2010. Nutrient concentrations, water transparency (Secchi depth) and chlorophyll-a showed a positive response to the reduced nutrient loads in the Polish eastern lagoon. This was not the case in the German western lagoon, where summer Secchi depth is 0.6 m and mean chlorophyll-a concentration is four times above the threshold for the Good Ecological Status. Measures to improve the water quality focused until now purely on nutrient load reductions, but the nutrient load targets and Maximal Allowable Inputs are contradicting between EU Water Framework Directive and EU Marine Strategy Framework Directive. According to the HELCOM Baltic Sea Action Plan, the thresholds of the annual riverine nutrient inputs to the lagoon would be about 48,850 t N (1,570 t P). Actions in the river basins that would allow meeting these targets are hardly achievable. Even if the load targets would be fully implemented, they are not sufficient to transfer the lagoon into a non-eutrophic state. The implementation of EU Water Framework Directive is further hampered, as consistent water quality thresholds for the two parts of Szczecin Lagoon are missing. An approach to harmonize them is presented, which incorporates the spatial differences. By implementing consistent water quality targets, Szczecin Lagoon could serve as blueprint for other trans-boundary waters. In the western lagoon, nutrient load reductions in the past decades had no effect on the water quality. High water residence times, frequent sediment resuspension and the missing submerged vegetation inhibit the load reduction effects on the water quality. Internal measures in the western lagoon are necessary, which aim at removing nutrients and increasing water transparency to overcome the hysteresis effect and to initiate a recovery of macrophytes. Cultivation of zebra mussels seems the most promising approach.

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Main Authors: Friedland, René, Schernewski, Gerald, Gräwe, Ulf, Greipsland, Inga, Palazzo, Dalila, Pastuszak, Marianna
Format: Journal Contribution biblioteca
Language:English
Published: 2019
Subjects:WFD, MSFD, HELCOM, Ocean management, Nutrient loads, Integrated ecosystem modelling, Internal measures, ASFA_2015::E::Eutrophication, ASFA_2015::Y::Zoobenthos, ASFA_2015::W::Water quality,
Online Access:http://hdl.handle.net/1834/15329
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spelling dig-aquadocs-1834-153292021-05-19T06:57:46Z Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives. Friedland, René Schernewski, Gerald Gräwe, Ulf Greipsland, Inga Palazzo, Dalila Pastuszak, Marianna WFD MSFD HELCOM Ocean management Nutrient loads Integrated ecosystem modelling Internal measures ASFA_2015::E::Eutrophication ASFA_2015::Y::Zoobenthos ASFA_2015::W::Water quality High riverine nutrient loads caused poor water quality, low water transparency and an unsatisfactory ecological status in the Szczecin (Oder) Lagoon, a trans-boundary water at the southern shore of the Baltic Sea. Total annual riverine N (P) loads into the lagoon raised at the 20th century from approximately 14,000 t TN (1,000 t TP) to 115,000 t TN (10,500 t TP) in the 1980ties and declined to about 56,750 t TN (2,800 t TP) after 2010. Nutrient concentrations, water transparency (Secchi depth) and chlorophyll-a showed a positive response to the reduced nutrient loads in the Polish eastern lagoon. This was not the case in the German western lagoon, where summer Secchi depth is 0.6 m and mean chlorophyll-a concentration is four times above the threshold for the Good Ecological Status. Measures to improve the water quality focused until now purely on nutrient load reductions, but the nutrient load targets and Maximal Allowable Inputs are contradicting between EU Water Framework Directive and EU Marine Strategy Framework Directive. According to the HELCOM Baltic Sea Action Plan, the thresholds of the annual riverine nutrient inputs to the lagoon would be about 48,850 t N (1,570 t P). Actions in the river basins that would allow meeting these targets are hardly achievable. Even if the load targets would be fully implemented, they are not sufficient to transfer the lagoon into a non-eutrophic state. The implementation of EU Water Framework Directive is further hampered, as consistent water quality thresholds for the two parts of Szczecin Lagoon are missing. An approach to harmonize them is presented, which incorporates the spatial differences. By implementing consistent water quality targets, Szczecin Lagoon could serve as blueprint for other trans-boundary waters. In the western lagoon, nutrient load reductions in the past decades had no effect on the water quality. High water residence times, frequent sediment resuspension and the missing submerged vegetation inhibit the load reduction effects on the water quality. Internal measures in the western lagoon are necessary, which aim at removing nutrients and increasing water transparency to overcome the hysteresis effect and to initiate a recovery of macrophytes. Cultivation of zebra mussels seems the most promising approach. Published 2019-07-05T21:45:30Z 2019-07-05T21:45:30Z 2019 Journal Contribution Refereed 10.3389/fmars.2018.00521 http://hdl.handle.net/1834/15329 en https://www.frontiersin.org/articles/10.3389/fmars.2018.00521/full 17pp. Poland Oder Lagoon Germany
institution UNESCO
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-aquadocs
tag biblioteca
region Europa del Oeste
libraryname Repositorio AQUADOCS
language English
topic WFD
MSFD
HELCOM
Ocean management
Nutrient loads
Integrated ecosystem modelling
Internal measures
ASFA_2015::E::Eutrophication
ASFA_2015::Y::Zoobenthos
ASFA_2015::W::Water quality
WFD
MSFD
HELCOM
Ocean management
Nutrient loads
Integrated ecosystem modelling
Internal measures
ASFA_2015::E::Eutrophication
ASFA_2015::Y::Zoobenthos
ASFA_2015::W::Water quality
spellingShingle WFD
MSFD
HELCOM
Ocean management
Nutrient loads
Integrated ecosystem modelling
Internal measures
ASFA_2015::E::Eutrophication
ASFA_2015::Y::Zoobenthos
ASFA_2015::W::Water quality
WFD
MSFD
HELCOM
Ocean management
Nutrient loads
Integrated ecosystem modelling
Internal measures
ASFA_2015::E::Eutrophication
ASFA_2015::Y::Zoobenthos
ASFA_2015::W::Water quality
Friedland, René
Schernewski, Gerald
Gräwe, Ulf
Greipsland, Inga
Palazzo, Dalila
Pastuszak, Marianna
Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
description High riverine nutrient loads caused poor water quality, low water transparency and an unsatisfactory ecological status in the Szczecin (Oder) Lagoon, a trans-boundary water at the southern shore of the Baltic Sea. Total annual riverine N (P) loads into the lagoon raised at the 20th century from approximately 14,000 t TN (1,000 t TP) to 115,000 t TN (10,500 t TP) in the 1980ties and declined to about 56,750 t TN (2,800 t TP) after 2010. Nutrient concentrations, water transparency (Secchi depth) and chlorophyll-a showed a positive response to the reduced nutrient loads in the Polish eastern lagoon. This was not the case in the German western lagoon, where summer Secchi depth is 0.6 m and mean chlorophyll-a concentration is four times above the threshold for the Good Ecological Status. Measures to improve the water quality focused until now purely on nutrient load reductions, but the nutrient load targets and Maximal Allowable Inputs are contradicting between EU Water Framework Directive and EU Marine Strategy Framework Directive. According to the HELCOM Baltic Sea Action Plan, the thresholds of the annual riverine nutrient inputs to the lagoon would be about 48,850 t N (1,570 t P). Actions in the river basins that would allow meeting these targets are hardly achievable. Even if the load targets would be fully implemented, they are not sufficient to transfer the lagoon into a non-eutrophic state. The implementation of EU Water Framework Directive is further hampered, as consistent water quality thresholds for the two parts of Szczecin Lagoon are missing. An approach to harmonize them is presented, which incorporates the spatial differences. By implementing consistent water quality targets, Szczecin Lagoon could serve as blueprint for other trans-boundary waters. In the western lagoon, nutrient load reductions in the past decades had no effect on the water quality. High water residence times, frequent sediment resuspension and the missing submerged vegetation inhibit the load reduction effects on the water quality. Internal measures in the western lagoon are necessary, which aim at removing nutrients and increasing water transparency to overcome the hysteresis effect and to initiate a recovery of macrophytes. Cultivation of zebra mussels seems the most promising approach.
format Journal Contribution
topic_facet WFD
MSFD
HELCOM
Ocean management
Nutrient loads
Integrated ecosystem modelling
Internal measures
ASFA_2015::E::Eutrophication
ASFA_2015::Y::Zoobenthos
ASFA_2015::W::Water quality
author Friedland, René
Schernewski, Gerald
Gräwe, Ulf
Greipsland, Inga
Palazzo, Dalila
Pastuszak, Marianna
author_facet Friedland, René
Schernewski, Gerald
Gräwe, Ulf
Greipsland, Inga
Palazzo, Dalila
Pastuszak, Marianna
author_sort Friedland, René
title Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
title_short Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
title_full Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
title_fullStr Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
title_full_unstemmed Managing Eutrophication in the Szczecin (Oder) Lagoon-Development, Present State and Future Perspectives.
title_sort managing eutrophication in the szczecin (oder) lagoon-development, present state and future perspectives.
publishDate 2019
url http://hdl.handle.net/1834/15329
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