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Case Studies
Case Studies

Case Studies (329)

Wednesday, 28 December 2011 12:10

St. Lawrence Estuary, Canada

Written by Johanna

St. Lawrence Estuary, Canada

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Declining dissolved oxygen has been recorded in St. Lawrence estuary for 70 years. Anoxia has developed during the last several decades. Hypoxic areas are avoided by fish.

Type of regime shift

Ecosystem type

  • Marine & coastal

Land uses

  • Fisheries
  • Conservation

Spatial scale of the case study

  • Sub-continental/regional (e.g. southern Africa, Amazon basin)

Continent or Ocean

  • North America

Region

  • Atlantic Ocean

Countries

  • Canada

Locate with Google Map

Key References

  1. Gilbert D, Sundby B, Gobeil C, Mucci A, Tremblay G-H. 2005. A Seventy-two-year record of diminishing deep-water oxygen in the St. Lawrence Estuary: The Northwest Atlantic connection. Limnology and Oceanography 50, 1654-1666.

Citation

Johanna Yletyinen. St. Lawrence Estuary, Canada. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:06 GMT.
Wednesday, 28 December 2011 11:55

Scheldt Estuary, Belgium

Written by Johanna

Scheldt Estuary, Belgium

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Persistent hypoxia.

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

  • Belgium

Locate with Google Map

Key References

  1. Verlaan PAJ. 1998. Mixing of marine and fluvial particles in the Scheldt estuary. PhD Thesis. Technische Universiteit Delft: Delft.

Citation

Johanna Yletyinen. Scheldt Estuary, Belgium. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:08 GMT.
Wednesday, 28 December 2011 11:33

Alyki Kitrous Lagoon, Greece

Written by Johanna

Alyki Kitrous Lagoon, Greece

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Alykes Kitrous Lagoon is a eutrophic, hypersaline lagoon. Hypoxia has reduced meiofauna.

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

  • Mediterranean

Countries

  • Greece

Locate with Google Map

Key References

  1. Doulgeraki A, Lampadariou N, Sinis A. 2006. Meiofaunal community structure in three Mediterranean coastal lagoons (North Aegean Sea). J. Mar. Biol. Ass. 86, 209-220

Citation

Johanna Yletyinen. Alyki Kitrous Lagoon, Greece. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:10 GMT.
Wednesday, 28 December 2011 10:15

Imboassica Lagoon, Brazil

Written by Johanna

Imboassica Lagoon, Brazil

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

The coastal Imboassica Lagoon receives non-treated sewage. Nutrient increase has been observed to cause an increase in chlorophyll a concentration and a decrease in dissolved oxygen.

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

  • South America

Region

  • East coast of South America

Countries

  • Brazil

Locate with Google Map

Key References

  1. Kozlowsky-Suzuki B, Bozelli RL. 2002. Experimental evidence of the effect of nutrient enrichment on the zooplankton in a Brazilian coastal lagoon. Brazilian Journal of Biology 62, 835-846.

Citation

Johanna Yletyinen. Imboassica Lagoon, Brazil. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:13 GMT.
Wednesday, 28 December 2011 09:54

Volga River Delta, Russia

Written by Johanna

Volga River Delta, Russia

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Anthropogenic pollution has affected the Volga delta ecosystems. Episodic hypoxia is associated with harmful algal blooms.

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

  • Caspian Sea

Countries

  • Russia

Locate with Google Map

Key References

  1. Bukharitsin PI, Luneva ZD. 1994. Water quality characteristics of the lower Volga reaches and the northern Caspian Sea Water resour.; Vodnye Resursy 4, 445-451.

Citation

Johanna Yletyinen. Volga River Delta, Russia. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:16 GMT.
Wednesday, 28 December 2011 09:37

Montevideo Bay, Uruguay

Written by Johanna

Montevideo Bay, Uruguay

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Hypoxia in the Montevideo Bay was first reported in the 1960s. It caused mass mortality of benthos (annual recolonization) and reduced fisheries. The hypoxic situation improved due to improved nutrient management in the 1990s. Fisheries are now recovering.

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

  • East coast of South America

Countries

  • Uruguay

Locate with Google Map

Key References

  1. Danulat E, Muniz P, Garcia-Alonso J, Yannicelli B. 2002. First assessment of the highly contaminated harbour of Montevideo, Uruguay. Marine Pollution Bulletin 44, 551-576.

Citation

Johanna Yletyinen. Montevideo Bay, Uruguay. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:18 GMT.
Wednesday, 28 December 2011 09:23

Lake of Tunis, Tunisia

Written by Johanna

Lake of Tunis, Tunisia

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Hypoxia in the eutrophic Lake of Tunis (a natural lagoon) may go back hundreds of years. It has caused fish kills and reduced worm reefs.

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

  • Africa

Region

  • North Africa

Countries

  • Tunisia

Locate with Google Map

Key References

  1. Kelly DM, M. Naguib M. 1984. Eutrophication in coastal marine areas and lagoons: a case study of ‘Lac de Tunis’. UNESCO Reports in Marine Science 29.

Citation

Johanna Yletyinen. Lake of Tunis, Tunisia. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:21 GMT.
Wednesday, 28 December 2011 09:09

Prawn culture pounds in Taiwan

Written by Johanna

Prawn culture pounds in Taiwan

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Decomposition of unconsumed food and feces cause hypoxia in prawn culture pounds in Taiwan. Hypoxia causes benthic mortality and reduced growth, depressed immune system and mortality in prawns.

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

  • Asia

Region

  • East Asia

Countries

  • China, Republic of (Taiwan)

Locate with Google Map

Key References

  1. Cheng W, Liu C-H, Hsu J-P, Chen J-C. 2002. Effects of hypoxia on the immune response of giant freshwater prawn Macrobrachium rosenbergii and its susceptibility to pathogen Enterococcus. Fish & Shellfish Immunology 5, 351-365.

Citation

Johanna Yletyinen. Prawn culture pounds in Taiwan. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:25 GMT.
Wednesday, 28 December 2011 08:40

Bornholm Basin, The Baltic Sea

Written by Johanna

Bornholm Basin, The Baltic Sea

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

The Baltic Sea is an eutrophic sea where hypoxia occurs regularly. Hypoxia in Bornholm Basin has caused mass mortality for benthos in wide areas.

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

  • Poland
  • Denmark
  • Germany

Locate with Google Map

Key References

  1. Zillén L, Conley DJ, Andrén T, Andrén E, Björck S. 2008. Past occurrences of hypoxia in the Baltic Sea and the role of climate variability, environmental change and human impact. Earth-Science Reviews 91, 77-92.

Citation

Johanna Yletyinen. Bornholm Basin, The Baltic Sea. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:06:31 GMT.
Tuesday, 27 December 2011 14:43

St. Anna Archipelago, Sweden

Written by Johanna

St. Anna Archipelago, Sweden

Main Contributors:

Johanna Yletyinen

Other Contributors:

Summary

Hypoxia first recorded in the 1980s.

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

Locate with Google Map

Key References

  1. 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. St. Anna Archipelago, Sweden. In: Regime Shifts Database, www.regimeshifts.org. Last revised 2012-03-17 19:08:28 GMT.