Long-term trends, current status, and transitions of water quality in Chesapeake Bay.

Examples include chl-a for the OH salinity zone in summer and fall with decreasing trends from 1965 to 2015, but increasing trends from 1985 to 2015; the MH salinity zone in fall with a decreasing trend from 1965 to 2015, but an increasing trend from 1985 to 2015; the PH salinity zone in spring with a decreasing trend from 1985 to 2015, but nearly constant chl- a for the complete time series.

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Spring chl-a showed increasing trends for OH and MH salinity zones, but was essentially constant for the PH salinity zone; summer chl-a showed an increasing trend for the MH salinity zone, but decreasing trends for OH and PH salinity zones; fall chl-a showed consistent, decreasing trends for OH, MH, and PH salinity zones (Fig. 6a ).

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