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Browse History: Upper Bay (2011)

Chesapeake Bay - Reporting Region Summary:



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Bay Health Index
Benthic Index of Biotic Integrity Icon
54%
C
Upper Bay: 2011

Moderate ecosystem health-highest ranked region in the Bay. Improvements in chlorophyll a and phytoplankton community scores offset decreases in water clarity and aquatic grass scores.
  • Water quality: Both dissolved oxygen and chlorophyll a scores for 2011 increased from 2010, and have risen to good and moderate condition, respectively. Dissolved oxygen increased to 84%, the highest level recorded in the region. Water clarity scores sharply declined to the lowest score recorded, a 3%. 
  • Biotic indicators: After improving dramatically in the past four years, aquatic grass scores declined to 68% in 2011 from 91% in 2010. Phytoplankton community condition scores strongly improved by 19% after a slight improvement last year, rising to a moderately poor score. The benthic community score remained steady at 72%.  

Score Legend
Locator Map
  Index/Indicator Score     Index/Indicator Score
Benthic Index of Biotic Integrity Icon Chlorophyll a
56%
  Benthic Index of Biotic Integrity Icon Aquatic grasses
68%
Benthic Index of Biotic Integrity Icon Dissolved oxygen
84%
  Benthic Index of Biotic Integrity Icon Benthic Index of Biotic Integrity
72%
Benthic Index of Biotic Integrity Icon Water clarity
3%
  Benthic Index of Biotic Integrity Icon Phytoplankton Index of Biotic Integrity
43%
 
Benthic Index of Biotic Integrity Icon Water Quality Index
48%
  Biotic Index Icon Biotic Index
61%
 

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