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Browse History: Mid Bay (2010)

Chesapeake Bay - Reporting Region Summary:



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Scores & Conceptual Diagram


Bay Health Index
Benthic Index of Biotic Integrity Icon
42%
C-
Mid Bay: 2010

Moderately poor ecosystem health. While all water quality indicators declined, phytoplankton community continues to improve and scored the highest in 19 years.
  • Water quality: All three indicators’ scores declined in 2010. However, dissolved oxygen scores only dropped by 1%, so it stayed in the same moderately good range that it has been in for more than 20 years. Water clarity scores dropped the most, from 40% in 2009 to 26% in 2010. This is the first drop in water clarity scores since 2006. Chlorophyll a scores remained poor.
  • Biotic indicators: Aquatic grasses and benthic community condition scores declined in 2010, remaining in very poor to poor condition. Phytoplankton community condition improved by 15% to score the highest (94%) since 1991 (100%). This improvement follows the trend seen since the dramatic drop in score in 2003. 

Score Legend
Locator Map
  Index/Indicator Score     Index/Indicator Score
Benthic Index of Biotic Integrity Icon Chlorophyll a
25%
  Benthic Index of Biotic Integrity Icon Aquatic grasses
15%
Benthic Index of Biotic Integrity Icon Dissolved oxygen
72%
  Benthic Index of Biotic Integrity Icon Benthic Index of Biotic Integrity
20%
Benthic Index of Biotic Integrity Icon Water clarity
26%
  Benthic Index of Biotic Integrity Icon Phytoplankton Index of Biotic Integrity
94%
 
Benthic Index of Biotic Integrity Icon Water Quality Index
41%
  Biotic Index Icon Biotic Index
43%
 

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