Data covering the marine environment, including fisheries, coral reef  health, ocean chemistry, and coastal zones.

oceans-seas-coasts

Oceans, Seas, & Coasts

The Interactive Map of Eutrophication & Hypoxia represents 762 coastal areas impacted by eutrophication and/or hypoxia. There are 479 sites identified as experiencing hypoxia, 55 sites that once experienced hypoxia but are now improving, and 228 sites that experience other symptoms of eutrophication, including algal blooms, species loss, and impacts to coral reef assemblages. These data were compiled using a literature search conducted by Dr. Robert Diaz of VIMS and WRI staff. Three types of status were recorded: 1) Hypoxic: Areas with scientiﬁc evidence that hypoxia was caused, at least in part, by nutrient overenrichment; 2) Eutrophic: Systems that exhibit effects of eutrophication, such as elevated nutrient levels, elevated chlorophyll a levels, harmful algal blooms, changes in the benthic community, damage to coral reefs, and ﬁsh kills. These systems are impaired by nutrients and are possibly at risk of developing hypoxia. Some of the systems classiﬁed as areas of concern may already be experiencing hypoxia, but lack conclusive scientiﬁc evidence of the condition; and 3) Improved hypoxic: Areas that once exhibited low dissolved oxygen levels and hypoxia, but are now improving. For example, the Black Sea once experienced annual hypoxic events, but is now in a state of recovery. Others, like Boston Harbor in the United States and the Mersey Estuary in the United Kingdom, also have improved water quality resulting from better industrial and wastewater controls. Resource Watch shows only a subset of the data set. For access to the full data set and additional information, see the Learn More link.  
  
### Additional Information  
  
Resource Watch shows only a subset of the dataset. For access to the full dataset and additional information, click on the “Learn more” button.  
  
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Excerpts of this description page were taken from the source metadata.

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Eutrophication and Hypoxia

Eutrophication and Hypoxia Status