US Long-Term Ecological Research Network
Code Definition
1 :

100 percent light

2 :

50 percent light

3 :

25 percent light

4 :

10 percent light

5 :

5 percent light

6 :

1 percent light

7 :

Hypolimnion

-1 :

Epilimnion/PML

-2 :

Metalimnion