Chesapeake Bay Benthic Monitoring Program

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Tidal Fresh Zone

The tidal fresh portion of the Upper Bay sampling stratum includes two segments: CB1TF and NORTF.  The latter refers to the Northeast River (see map), which is discussed in more detail as part of the Upper Eastern Shore Basin. The mainstem segment probabilities of observing degraded benthos are given in Table 1, below. 

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Water Quality Map
Segment Analysis

Benthic community condition for Upper Bay sites,
segments CB1TF and NORTF.
Red = Severely Degraded; Black = Degraded;
Violet = Marginal; Green = Meets Goals
All sites sampled to date (1994-2003) shown.



Table 1.  Total number of sites, degraded sites, and probabilities* (90% confidence limits) of observing degraded benthos, non-degraded benthos, or benthos of indeterminate condition for the Maryland Upper Bay mainstem, 1999-2003.

* Probabilities adjusted according to Agresti and Caffo (2000).  Confidence limits adjusted for segments with ≥ 5 sites.  Exact confidence limits used for segments with < 5 sites.
Note: This latest assessment for the Tributary Teams uses only 5 years of data (1999-2003); methods are described in Llansσ et al. 2003.  Segments are Chesapeake Bay Program subunits having similar salinity and hydrographic characteristics.

 

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URL http://esm.versar.com/vcb/benthos/basins/upbay_tf.htm

Revised: January 25, 2005.