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Browse History: Lower Bay (2011)

Chesapeake Bay - Reporting Region Summary:



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Bay Health Index
Benthic Index of Biotic Integrity Icon
48%
C
Lower Bay: 2011

Moderate ecosystem health. Overall health remained the same, with an improved phytoplankton community and moderately decreased water quality scores.
  • Water quality: All water quality indicators’ scores decreased in 2011, with water clarity scores decreasing from 19% in 2010 to 7.3% in 2011. However, this was the highest scoring region (along with the Rappahannock River) for water clarity. Dissolved oxygen decreased slightly to moderately poor condition (79%). Chlorophyll a also slightly decreased to 8.5%. 
  • Biotic Indicators: Aquatic grasses moderately declined by 17%, the score decreased from 46% in 2010 to 30% in 2011 (a poor score). Benthic community scores remained relatively unchanged from 2010. The phytoplankton community condition score was 92%, a large increase and the best score for this indicator in the Bay. 

Score Legend
Locator Map
  Index/Indicator Score     Index/Indicator Score
Benthic Index of Biotic Integrity Icon Chlorophyll a
9%
  Benthic Index of Biotic Integrity Icon Aquatic grasses
30%
Benthic Index of Biotic Integrity Icon Dissolved oxygen
79%
  Benthic Index of Biotic Integrity Icon Benthic Index of Biotic Integrity
73%
Benthic Index of Biotic Integrity Icon Water clarity
7%
  Benthic Index of Biotic Integrity Icon Phytoplankton Index of Biotic Integrity
92%
 
Benthic Index of Biotic Integrity Icon Water Quality Index
31%
  Biotic Index Icon Biotic Index
65%
 

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