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Identify Stresses

Where are aquatic populations stressed?

These four maps show the distributions of known stressors that affect native aquatic species. The maps are meant to give you an example of what can be displayed.

Note that the geographic distribution is different for each variable. Each of these stressors has a different source, is controlled by different factors (precipitation, air flow patterns, agricultural practices, etc.), and results in a different spatial pattern. As we will see on the next page, vulnerability increases in areas which are affected by more than one of the stressors.

Nitrogen in surface water
Nitrogen deposition
Sediment in water
Introduced(exotic) aquatic species

 
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