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Case Studies
Case Studies (332)
Dubai Creek, United Arab Emirates
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Dubai Creek has received high levels of organic loading from sewage. Hypoxia has decreased benthic abundance and diversity.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Asia
Region
- Arabian Peninsula
Countries
- United Arab Emirates
Locate with Google Map
Key References
-
Saunders J, Zahedb KMA, Paterson DM. 2007. The impact of organic pollution on the macrobenthic fauna of Dubai Creek (UAE). Marine Pollution Bulletin 54, 1715-1723.
Citation
Johanna Yletyinen.
Dubai Creek, United Arab Emirates.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:00:01 GMT.
Published in
Case Studies
Tanshui Estuary, Taiwan
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Six million people live in the catchment area of the Tanshui River system. The Tanshui Estuary is heavily polluted since it receives untreated domestic discharge and both treated and untreated industrial effluent from its tributaries. Untreated domestic sewage and industrial waste contribute to hypoxia in the upper estuary.
Type of regime shift
Ecosystem type
- Marine & coastal
- Freshwater lakes & rivers
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Asia
Region
- East Asia
Countries
- China, Republic of (Taiwan)
Locate with Google Map
Key References
-
Fang T-H, Lin C-L. 2002. Dissolved and particulate trace metals and their partitioning hypoxic estuary: The Tanshui Estuary in northern Taiwan. Estuaries 25, 598-607.
Citation
Johanna Yletyinen.
Tanshui Estuary, Taiwan.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:00:03 GMT.
Published in
Case Studies
Idefjord, Sweden and Norway
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Persistent hypoxia in Idefjord caused bethic mortality and reduced benthos. The hypoxia was first recorded in the 1960s. After closing of the local sulfite pulp mill, the fjord has recovered.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Europe
Region
- North Europe
Countries
- Norway
- Sweden
Locate with Google Map
Key References
-
Hanslik D, Rosenberg K. 2006. The foraminiferal record of pollution and recovery of the formerly heavily polluted Idefjord, Sweden/Norway. Abstract, Svenska Havsforskarföreningen, Havsforskarmöte in Göteborg, 2-4 October 2001. Geophysical Research Abstracts 8.
Citation
Johanna Yletyinen.
Idefjord, Sweden and Norway.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:00:07 GMT.
Published in
Case Studies
Northern Baltic Sea
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
The Baltic Sea hypoxia is caused by eutrophication and limited salt water input from the North Sea. In the northern Baltic Sea hypoxia is rare in the estuaries of the Bothnian Sea coastal zone. In the Swedish and Finnish archipelagos hypoxia is influenced by phytoplankton growth due to eutrophication and restricted water circulation.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Sub-continental/regional (e.g. southern Africa, Amazon basin)
Continent or Ocean
- Europe
Region
- North Europe
Countries
- Sweden
- Finland
Locate with Google Map
Key References
-
Conley D et al. 2011. Hypoxia Is Increasing in the Coastal Zone of the Baltic Sea. Environ. Sci. Technol. 2011, 6777–6783.
Citation
Johanna Yletyinen.
Northern Baltic Sea.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 18:59:41 GMT.
Published in
Case Studies
Stockholm Inner Archipelago, Sweden
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
In the early 1970s the inner Stockholm archipelago was highly eutrophic. After decreases in nutrient inputs the environmental status has improved. Hypoxia has decreased in some - but not all - parts of the archipelago.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Europe
Region
- North Europe
Countries
- Sweden
Locate with Google Map
Key References
-
Karlsson M, Jonsson P. 2010. Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago. Ambio 38, 486-495.
Citation
Johanna Yletyinen.
Stockholm Inner Archipelago, Sweden.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:00:15 GMT.
Published in
Case Studies
Sea of Azov
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia in the Sea of Azov has caused benthic mortality. Significant anoxia occurred in 1937, 1946, 1987 and 2001.
Type of regime shift
Ecosystem type
- Marine & coastal
- Freshwater lakes & rivers
Land uses
- Fisheries
Spatial scale of the case study
- Sub-continental/regional (e.g. southern Africa, Amazon basin)
Continent or Ocean
- Asia
Region
- Europe - Asia
Countries
- Russia
- Ukraine
Locate with Google Map
Key References
-
Debolskaya EI, Yakushev EV, Sukhinov AI. 2005. Formation of fish kills and anaerobic conditions in the Sea of Azov. Water Resources 32, 151-162.
Citation
Johanna Yletyinen.
Sea of Azov.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 18:59:44 GMT.
Published in
Case Studies
Himmerfjärden, Sweden
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Himmerfjärden in southern Stockholm archipelago receives treated sewage. Himmerfjärden is stratified during summer, when hypoxia in bottom waters may develop. Sea ice may limit water exchange with the open Baltic Sea during winter.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Europe
Region
- North Europe
Countries
- Sweden
Locate with Google Map
Key References
-
Savage C, Elmgren R, Larsson U. 2002. Effects of sewage-derived nutrients on an estuarine macrobenthic community. Marine Ecology Progress Series 234, 67-82.
Citation
Johanna Yletyinen.
Himmerfjärden, Sweden.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:00:20 GMT.
Published in
Case Studies
Gotland Basin, the Baltic Sea
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia in the Gotland Basin was first recorded in the 1960s. It has caused benthic mortality and hypoxia areas are avoided by fish. Low dissolved oxygen content creates poor recruitment conditions for cod: mortality and low hatching of cod eggs together with reduced cod prey have been observed. Benthos recolonize the affected areas after bottom water renewal. Gotland Deep in the eastern Gotland Basin is anoxic.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Sub-continental/regional (e.g. southern Africa, Amazon basin)
Continent or Ocean
- Europe
Region
- The Baltic Sea
Countries
- Sweden
- Estonia
- Latvia
Locate with Google Map
Key References
-
Laine A, Sandler H, Andersin A-B, Stigzelius J. 1997. Long-term changes of macrozoobenthos in the Eastern Gotland Basin and the Gulf of Finland (Baltic Sea) in relation to the hydrographical regime. Journal of Sea Research 38, 135-159.
Citation
Johanna Yletyinen.
Gotland Basin, the Baltic Sea.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 18:59:46 GMT.
Published in
Case Studies
Byfjord, Sweden
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Deep water hypoxia and anoxia in Byfjord are caused by stagnant water; the fjord is strongly stratified andwater renewal time is 2-5 years
Type of regime shift
Ecosystem type
- Marine & coastal
- Freshwater lakes & rivers
Land uses
- Fisheries
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Europe
Region
- North Europe
Countries
- Sweden
Locate with Google Map
Key References
-
Rosenberg R, Olsson I, Ölundh E. 1977. Energy flow model of an oxygen-deficient estuary on the Swedish west coast. Marine Biology 42, 99-107.
Citation
Johanna Yletyinen.
Byfjord, Sweden.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:01:33 GMT.
Published in
Case Studies
Arkona Basin, the Baltic Sea
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia in the Arkona basin is persistent and anoxia occurs regularly below the halocline. Hypoxia in the Baltic Sea is caused by eutrophication and limited salt water input from the North Sea.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Fisheries
Spatial scale of the case study
- Sub-continental/regional (e.g. southern Africa, Amazon basin)
Continent or Ocean
- Europe
Region
- The Baltic Sea
Countries
- Sweden
- Denmark
- Germany
Locate with Google Map
Key References
-
Karlson K, Rosenberg R, Bonsdorff E. 2002. Temporal and spatial large-scale effects of eutrophication and oxygen deficiency on benthic fauna in Scandinavian and Baltic waters: A review. Oceanography and Marine Biology 40, 427-489.
Citation
Johanna Yletyinen.
Arkona Basin, the Baltic Sea.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:01:31 GMT.
Published in
Case Studies
