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Freshwater mussel records collected by the Maryland Department of ...

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Figure 19. continued<br />

A<br />

P<br />

A<br />

P<br />

A<br />

P<br />

0 20 40 60 80 100<br />

% Urban<br />

0 20 40 60 80 100<br />

% Agriculture<br />

0 20 40 60 80 100<br />

% Forest<br />

p = 0.004 p = 0.09<br />

p = 0.002<br />

p = 0.12<br />

45<br />

A<br />

P<br />

A<br />

P<br />

A<br />

P<br />

0 10 20 30 40<br />

% Impervious Surface<br />

p = 0.02<br />

0 5000 10000 15000 20000 25000 30000<br />

Catchment Acreage<br />

p = 0.001<br />

0.0 0.2 0.4 0.6 0.8 1.0<br />

Gradient (% slope)

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