Environmental Science 12th Edition by William Cunningham,Mary Ann Cunningham

Exercise 19

You know that nutrients are an important concern in the Chesapeake Bay watershed in general, but now you can examine the details and see how conditions have changed. Go to www.eco-check.org \reportcard \chesapeake. This site is maintained by the University of Maryland and the National Oceanic and Atmospheric Administration (NOAA), with support of many collaborators and data providers.
Chlorophyll is something you've read about in this chapter. Concentrations of chlorophyll in Chesapeake Bay indicate amounts of tiny floating algae cells-algae nourished by nitrogen and phosphorus from onshore sources. Take a look at chlorophyll-a levels in the bay: roll your mouse over the Indicators and Indices, and click on the "chlorophyll-a" icon (this is one of several kinds of chlorophyll).
Take a few minutes to look at the Threshold map, as well as the definitions to answer the questions below.

Now look at the Trends Graph tab. Overall would you say that the trend has been an improvement since 1986 Turn on and off the different tributary rivers (different colored boxes below the graph). Which one has had the lowest score in general Where is the worst one located