Message
Johanna
Friday, 16 December 2011 12:11
Kiel Bight, Germany
Kiel Bight, Germany
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seasonal hypoxia in Kiel Bight may occur during summer and cause stress for fish and mass bethic mortality (annual recolonization). Hypoxia was first recorded in the 1960s.
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
- The Baltic Sea
Countries
- Germany
Locate with Google Map
Key References
-
Meyer-Reil LA. 1983. Benthic response to sedimentation events during autumn to spring at a shallow water station in the Western Kiel Bight. II Analysis of benthic bacterial populations. Marine Biology 77, 247-256.
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Rachor E. 1982. Seasonal and long-term population fluctuations in Diastylis Rathkei (Crustacea: Cumacea) of Kiel Bay and German Bight. Netherlands Journal of Sea Research 16, 141-150.
Citation
Johanna Yletyinen.
Kiel Bight, Germany.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 14:36:59 GMT.
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Friday, 16 December 2011 11:40
German Bight, North Sea
German Bight, North Sea
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seasonal hypoxia in German Bight causes mass mortality of benthos (annual recolonization). An exceptionally low dissolved oxygen content and consequent benthos mortality occurred in bottom waters in 1983. A rapid recovery began in 1984 and by 1986, biomass of the fauna and species diversity had returned to values similar to those observed before the hypoxic event. Area affected was ca 15 000 km2. (See also: North Sea hypoxia case study).
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 Sea
Countries
- Germany
Locate with Google Map
Key References
-
Niermann U, Bauerfeind E, Hickel W, Westernhagen HV. 1990. The recovery of benthos following the impact of low oxygen content in the German Bight. Netherlands Journal of Sea Research 25, 215-226.
Citation
Johanna Yletyinen.
German Bight, North Sea.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:28:09 GMT.
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Friday, 16 December 2011 10:39
Elbe Estuary, Germany
Elbe Estuary, Germany
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seasonal hypoxia in the Elbe Estuary has caused mortality of larval and juvenile fish, which are not able to escape the hypoxic conditions. Since 1990 hypoxic conditions have improved probably due to reduced pollution.
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 Sea
Countries
- Germany
Locate with Google Map
Key References
-
Flugge G. 1985. Gewasserokologische Ubenvachung der Elbe. Sauerstoffmangell Fischsterben/Schwermetalle/chlorierte Kohlenwasserstoffe-Analyse der Ursachen. Abkandlungen des naturwissenschaftlichen Vereins zu Bremen 40, 217-232.
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Thiel R, Sepúlveda A, Kafemann R, Nellen W. 1995. Journal of Fish Biology 46, 47-69.
Citation
Johanna Yletyinen.
Elbe Estuary, Germany.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:28:12 GMT.
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Friday, 16 December 2011 10:23
Eckernforde Bay, Germany
Eckernforde Bay, Germany
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
The seasonal hypoxia of Eckernforde Bay has caused mass mortalities in 1897, 1931 and 1936-67. Hypoxia is common during summer and autumn and causes benthic mortality (annual recolonization).
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
- The Baltic Sea
Countries
- Germany
Locate with Google Map
Key References
-
Nittrouer C, Lopez G, Wright D, Bentley J, D'Andrea A, Friedrichs C, Craig N, Sommerfield C. 1998. Oceanographic processs and the preservation of sedimentary structure in Eckernförde Bay, Baltic Sea. Continental Shelf Research 18, 1689-1714.
Citation
Johanna Yletyinen.
Eckernforde Bay, Germany.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:28:16 GMT.
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Friday, 16 December 2011 10:01
Thau Lagoon, France
Thau Lagoon, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seasonal hypoxia in the Thau Lagoon has resulted in mass mortality and reduced shellfish production. The Thau Lagoon is an important oyster and mussel production site. Being a shallow, almost closed lagoon, the water residence time is 200 days on average.
Type of regime shift
Ecosystem type
- Marine & coastal
- Freshwater lakes & rivers
Land uses
- Fisheries
- Tourism
Spatial scale of the case study
- Local/landscape (e.g. lake, catchment, community)
Continent or Ocean
- Europe
Region
- South France
Countries
- France
Locate with Google Map
Key References
-
Bacher C, Bioteau H, Chapelle A. 1995. Modelling the impact of a cultivated oyster population on the nitrogen dynamics: the Thau Lagoon case (France). Ophelia 42, 29-54.
Citation
Johanna Yletyinen.
Thau Lagoon, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-12 10:10:03 GMT.
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Friday, 16 December 2011 09:36
Seine Estuary, France
Seine Estuary, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seine river is affected by dense population and intense industrial and agricultural activity. The discharges have resulted in severe seasonal hypoxia.
Type of regime shift
Ecosystem type
- Marine & coastal
- Freshwater lakes & rivers
Land uses
- Fisheries
- Conservation
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
-
Billen G, Garnier J, Ficht A, Cun C. 2001. Modeling the response of water quality in the Seine river estuary to human activity in its watershed over the last 50 years. Estuaries 24, 977-993.
Citation
Johanna Yletyinen.
Seine Estuary, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-03-26 08:31:41 GMT.
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Friday, 16 December 2011 09:07
Loire Estuary, France
Loire Estuary, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Seasonal hypoxia in Loire Estuary may occur in the middle and upper parts of the estuary during several months in summer. It is suggested that hypoxia develops when the river discharge is low and temperature is increasing.
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
- West Europe
Countries
- France
Locate with Google Map
Key References
-
Marchand J. 1993. The influence of seasonal salinity and turbidity maximum variations on the nursery functions of the Loire estuary (France). Netherlands Journal of Aquatic Ecology 27, 427-436.
Citation
Johanna Yletyinen.
Loire Estuary, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:30:19 GMT.
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Friday, 16 December 2011 08:20
Etang de Berre, France
Etang de Berre, France
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Etang de Berre is a Mediterranean lagoon, which has received discharge of a hydroelectric plant since 1966. Inflow of fresh water has increased. Previously rich benthic life has been absent since 1972. Bottom waters, which used to be saturated with oxygen,are now anoxic below 5m depth, and strong salinity stratification has been established. In the southern lagoon there are marine water inflows.
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
- France
Locate with Google Map
Key References
-
Rossignol-Strick M. 1985. A marine anoxic event on the Brittany Coast, July 1982. Journal of Coastal Research 1, 11-20
Citation
Johanna Yletyinen.
Etang de Berre, France.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 13:44:06 GMT.
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Thursday, 15 December 2011 16:12
Neva Bay, Russia
Neva Bay, Russia
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Neva Bay is an eutrophic area. Decomposition of macroalgae causes seasonal (late July - August) hypoxic and anoxic conditions in the coastal zone of the Neva estuary. Hypoxia and anoxia have changed the structure and dynamics of invertebrate communities according to the species' degree of adaptability.
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 Russia
Countries
- Russia
Locate with Google Map
Key References
-
Berezina NA, Golubkov SM. 2008. Responses of coastal zoobenthos to stress induced by drifting algae in the Neva estuary. US/EU-Baltic International Symposium, 2008 IEEE/OES 1, 27-29
Citation
Johanna Yletyinen.
Neva Bay, Russia.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-12 07:46:58 GMT.
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Thursday, 15 December 2011 15:53
Inre Verkviken, Finland
Inre Verkviken, Finland
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Inre Verkviken in Åland is a 20m deep, stagnant brackish inlet with seasonal hypoxia. Water below 10-15m becomes anoxic with year to year variation in late summers.
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
- Finland
Locate with Google Map
Key References
-
Lindholm T. 1981. On the ecology of Mesodinium rubrum(Lohman)(Ciliata) in a stagnant brackish basin on Aland, SW Finland. Kieler Meeresforsch. 5, 117-123.
Citation
Johanna Yletyinen.
Inre Verkviken, Finland.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 14:20:58 GMT.
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