Message
Johanna
Thursday, 15 December 2011 12:26
Ringkøbing Fjord, Denmark
Ringkøbing Fjord, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Ringkoping Fjord is actually a coastal lagoon. Since the early 1980s, more or less widespread hypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and duration of hypoxia.
The most severe and widespread open waters hypoxia occurred in 2002 when a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
The most severe and widespread open waters hypoxia occurred in 2002 when a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
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 Sea
Countries
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
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.
Ringkøbing Fjord, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:32:45 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 12:05
Odense Fjord, Denmark
Odense Fjord, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia and anoxia are to a certain scale natural phenomena in many deep fjords. In Odense Fjord, high biomass of algae and eutrophication has contributed to hypoxia. Since the early 1980s, more or less widespread hypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and duration of hypoxia. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic. The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
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
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
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.
-
Lundholm N, Clarke A, Ellegaard M. 2010. A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature. Harmful Algae 9, 449-475.
Citation
Johanna Yletyinen.
Odense Fjord, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-12 11:39:18 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 11:55
Nivå Bugt, Denmark
Nivå Bugt, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Since the early 1980s, more or less widespread hypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and duration of hypoxia.
The most severe and widespread open waters hypoxia occurred in 2002 when a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
The most severe and widespread open waters hypoxia occurred in 2002 when a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
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
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
Lundholm N, Clarke A, Ellegaard M. 2010. A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature. Harmful Algae 9, 449-475.
Citation
Johanna Yletyinen.
Nivå Bugt, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:33:03 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 11:01
Nissum Fjord, Denmark
Nissum Fjord, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia and anoxia are to a certain scale natural phenomena in many deep fjords. Since the early 1980s, more or less widespread hypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and duration of hypoxia. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
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
- Northern Europe
Countries
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
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.
-
Lundholm N, Clarke A, Ellegaard M. 2010. A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature. Harmful Algae 9, 449-475.
Citation
Johanna Yletyinen.
Nissum Fjord, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:33:12 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 10:53
Limfjorden, Denmark
Limfjorden, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia in Limfjorden is seasonal and has caused mass mortality of benthos (with annual recolonization). In 1990s it was marked that during the last 80 years, fish yields had been decreasing in Limfjorden and benthos seemed to display similar trends. It has been found out that at least in three occassions mass mortality has likely been caused by oxygen deficiency.
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
- Northern Europe
Countries
- Denmark
Locate with Google Map
Key References
-
Hylleberg J. 1993. Extinction and immigration of benthic fauna, the value of historical data from Limfjorden, Denmark. Ist. Sci. Ambientali Mar., Santa Margeherita Ligure, 43-70.
Citation
Johanna Yletyinen.
Limfjorden, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:33:17 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 10:31
Køge Bugt, Denmark
Køge Bugt, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Since the early 1980s, more or less widespread hypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and duration of hypoxia.
The most severe and widespread open waters hypoxia occurred in 2002 from a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
The most severe and widespread open waters hypoxia occurred in 2002 from a combination of unusually high winter precipitation and unusually calm, warm weather in late summer and autumn. Hypoxic events in Danish estuaries are not in phase with the open waters; the most severe hypoxic episode in estuaries was reported in 1997 when parts of the Mariager Fjord turned completely anoxic.
The response of marine benthic macrofaunal communities to seasonal hypoxia in coastal Denmark is a collapse or mass mortality.
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
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
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.
Køge Bugt, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 15:33:21 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 10:17
Kattegat, Sweden & Denmark
Kattegat, Sweden & Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia was first recorded in 1981 when large areas of the Kattegat had widespread severe hypoxia. Seasonal or more or less permanent hypoxia has resulted in benthic mortality. Hypoxia dominates the south-eastern part but occurs occasionally everywhere. In the southeast (open Kattegat) hypoxia is caused by increased input of nutrients and stratification since 1980s with negative effects on benthic animals and commercial fish species in most of the years.
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
Locate with Google Map
Key References
-
Andresson L, Rydberg L. 1988. Trends in nutrient and oxygen conditions within the Kattegat: Effects on local nutrient supply. Estuarine, Coastal and Shelf Science 26, 559-579.
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
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.
Kattegat, Sweden & Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2011-12-19 16:39:34 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 09:44
Flensborg Fjord, Denmark
Flensborg Fjord, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
Hypoxia and anoxia are to a certain extent natural phenomena in many deep fjords. Since the early 1980s, more or less widespreadhypoxia has been observed nearly every autumn in Danish coastal waters. The causes of hypoxia in Denmark are related to increased nutrient loads and natural physical factors (e.g. weather) affecting the timing and scale of hypoxia. The response of marine benthic macrofaunal communities to seasonal hypoxia iscollapse or mass mortality.
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
- Denmark
Locate with Google Map
Key References
-
Conley J, Carstensen J, Ærterbjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefsen A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
-
Lundholm N, Clarke A, Ellegaard M. 2010. A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature. Harmful Algae 9, 449-475.
Citation
Johanna Yletyinen.
Flensborg Fjord, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 13:46:46 GMT.
Published in
Case Studies
Tagged under
Thursday, 15 December 2011 08:30
Coastal waters, Denmark
Coastal waters, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
The first widespread severe hypoxia in Denmark was recorded in 1981. Since then, hypoxia has been observed nearly every autumn in Danish coastal waters. The most severe and widespread hypoxia occurred in the late summer and autumn of 2002.
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
- Northern Europe
Countries
- Denmark
Locate with Google Map
Key References
-
Conley D, Carstensen J, Ærtebjerg G, Christensen PB, Dalsgaard T, Hansen J, Josefson A. 2007. Long-term changes and impacts of hypoxia in Danish coastal waters. Ecological Applications 17, 165-184.
Citation
Johanna Yletyinen.
Coastal waters, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 13:18:57 GMT.
Published in
Case Studies
Tagged under
Wednesday, 14 December 2011 16:00
Belt Seas, Denmark
Belt Seas, Denmark
Main Contributors:
Johanna Yletyinen
Other Contributors:
Summary
The Belt Seas have been affected by seasonal hypoxia since the 1970s with negative consequences for the bottom fauna.
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
- Baltic Sea
Countries
- Denmark
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.
Belt Seas, Denmark.
In: Regime Shifts Database, www.regimeshifts.org.
Last revised 2012-01-11 12:25:37 GMT.
Published in
Case Studies
Tagged under
