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Case Studies (332)
Newport Bay, USA
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Newport Bay hypoxia was first documented in the 1980s. It has been observed that the area didn't suffer from hypoxia in the 70s.
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
- North America
Region
- East coast of North America
Countries
- United States
Locate with Google Map
Key References
-
Committee on Environment and Natural Resources. 2010. Scientific Assessment of Hypoxia in U.S. Coastal Waters. Interagency Working Group on Harmful Algal Blooms, Hypoxia, and Human Health of the Joint Subcommittee on Ocean Science and Technology. Washington, DC.
Citation
Johanna Yletyinen.
Newport Bay, USA.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:31:22 GMT.
Published in
Case Studies
Bon Secour Bay, USA
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Bon Secour Bay hypoxia has caused mortality of benthos and loss of oysters. It was documented in the 2000s.
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
- North America
Region
- Gulf of Mexico
Countries
- United States
Locate with Google Map
Key References
-
Committee on Environment and Natural Resources. 2010. Scientific Assessment of Hypoxia in U.S. Coastal Waters. Interagency Working Group on Harmful Algal Blooms, Hypoxia, and Human Health of the Joint Subcommittee on Ocean Science and Technology. Washington, DC.
Citation
Johanna Yletyinen.
Bon Secour Bay, USA.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:31:25 GMT.
Published in
Case Studies
Koljo Fjord, Sweden
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Koljö Fjord experiences frequently occurring hypoxia and anoxia. The episodes last for months or even years and cause benthic mortality. The fjord is seriously affected by human-induced eutrophication.
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
-
Nordberg K, Filipsson H, Gustafsson M, Harland R, Roos P. Climate, hydrographic variations and marine benthic hypoxia in Koljö Fjord, Sweden. Journal of Sea Research 46, 3-4.
Citation
Johanna Yletyinen.
Koljo Fjord, Sweden.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:31:29 GMT.
Published in
Case Studies
Jobos Bay, Puerto Rico
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Jobos Bay is a tropical estuary with coral reefs, seagrass beds, mangrove forests, mudflats, and evergreen littoral forests. Several endangered species live in the area, which is federally protected.
Most of the land north of the bay is devoted to agriculture and the area is experiencing urban and industrial development pressures. Periodic hypoxia has been observed since the 1990s.
Most of the land north of the bay is devoted to agriculture and the area is experiencing urban and industrial development pressures. Periodic hypoxia has been observed since the 1990s.
Type of regime shift
Ecosystem type
- Marine & coastal
Land uses
- Conservation
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Atlantic Ocean
Region
- Northeastern Caribbean, Puerto Rico
Countries
- United States
Locate with Google Map
Key References
-
Wenner E, Sanger D, Arendt M, Frederick Holland F, Chen Y. 2004. Variability in Dissolved Oxygen and Other Water-Quality Variables Within the National Estuarine Research Reserve System. Journal of Coastal Research 45, 17 – 38.
Citation
Johanna Yletyinen.
Jobos Bay, Puerto Rico.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:31:33 GMT.
Published in
Case Studies
Ria Formosa, Portugal
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Ria Formosa is a shallow lagoon with periodic hypoxia. Dissolved oxygen content varies in different parts of the lagoon. In the inner part of the lagoon hypoxia is a concern for aquaculture and fisheries.
Studies on Ria Formosa show different results on the extent of the hypoxia.
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
- South Europe
Countries
- Portugal
Locate with Google Map
Key References
-
Newton A, Oliveira P, Icely J, Foster P. 2010. Monitoring of oxygen condition in the Ria Formosa coastal lagoon, Portugal. Journal of Environmental Monitoring 12, 355-360.
Citation
Johanna Yletyinen.
Ria Formosa, Portugal.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-12 09:10:14 GMT.
Published in
Case Studies
Westerschelde Estuary, Netherlands
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Periodic hypoxia due to industry and live stock farming.
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
- Western Europe
Countries
- Netherlands
Locate with Google Map
Key References
-
Hampel H. 2002-2003. Factors influencing the habitat value of tidal marshes for nekton in the Westerschelde estuary. University of Gent Department of Biology, Belgium.
Citation
Johanna Yletyinen.
Westerschelde Estuary, Netherlands.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:31:40 GMT.
Published in
Case Studies
Chinhae Bay, Korea
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia has been annual in the Chinhae Bay from 1980s. Together with red tides hypoxia has resulted in oyster mortality. Water circulation of the Chihae Bay is restricted because of its narrow mouth. Eutrophication, which began in 1970s, has accelerated from 1980s in the inner part of Chinhae Bay due to large inputs of domestic and industrial wastes. Low dissolved oxygen content in Chinhae Bay was first measured in the mid-70s. In addition, many shellfish culture farms have been established in and around the bay. Hypoxia is now (since 1985) an annual event and covers about 54% of the bay.
Hypoxia in Chinhae Bay usually starts in May, covers the widest area by September, and returns back to normoxic condition by October. It is controlled by temperature and stratification, and to a lesser extent salinity. Summer hypoxia and near anoxic conditions have resulted in annual mass mortality of benthos and altered community structure. The affected communities have partially recovered. The recolonization by benthos takes 1-4 months after the return of normodic conditions.
Hypoxia (and organic pollution) has caused decreases in aquaculture production in Chinhae Bay. The bay is also a spawning and nursery ground for many economically important fish species.
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
- Southern Korean peninsula
Countries
- Korea, Republic of (South Korea)
Locate with Google Map
Key References
-
Lim HS, Diaz R, Hong JS, Schaffner L. 2006. Hypoxia and benthic community recovery in Korean coastal waters. Marine Pollution Bulletin 52, 1517-1526.
Citation
Johanna Yletyinen.
Chinhae Bay, Korea.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-17 19:41:27 GMT.
Published in
Case Studies
Prevost Lagoon, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Periodic hypoxia in Prevost Lagoon has caused mass mortality (with annual recolonization) and reduced aquaculture production. Prevost Lagoon is eutrophic.
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
- Southern France
Countries
- France
Locate with Google Map
Key References
-
Guyoneaudl R, Matheron R, Baulaigue R , Podeur K, Hirschler A, Caumettel P. 1996. Anoxygenic phototrophic bacteria in eutrophic coastal lagoons of the French Mediterranean and Atlantic Coasts (Prevost Lagoon, Arcachon Bay, Certes fishponds). Hydrobiologia 329, 33-43.
Citation
Johanna Yletyinen.
Prevost Lagoon, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-12 09:03:00 GMT.
Published in
Case Studies
Gironde Estuary, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Periodic hypoxia associated with tides and fluid mud of the estuary.
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
- West Europe
Countries
- France
Locate with Google Map
Key References
-
Abril G, Etcheber H, Le Hir P, Bassoullet P, Boutier B, Frankignoulle M. 2011. Oxic/Anoxic Oscillations and Organic Carbon Mineralization in an Estuarine Maximum Turbidity Zone (The Gironde, France). Limnology and Oceanography 44, 1304-1315
Citation
Johanna Yletyinen.
Gironde Estuary, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-11 16:23:01 GMT.
Published in
Case Studies
Patos Lagoon, Brazil
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Periodic hypoxia in Patos Lagoon is caused by both natural and anthropogenic factors. It has resulted in fish kills.
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
- South America
Region
- Southeastern Brazil
Countries
- Brazil
Locate with Google Map
Key References
-
Diaz R, Rosenberg R. 2008. Spreading Dead Zones and Consequences for Marine Ecosystems. Science 321,926-929
Citation
Johanna Yletyinen.
Patos Lagoon, Brazil.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-13 11:43:49 GMT.
Published in
Case Studies
