Parthenocissus
quinquefolia


0.4


0.3


 1 -

 0.8 -

S0.6-

A 0.4

 0.2

 0


90%


Polygonum spp.


I m 1 0 "


70% 50% 30% 10%


Pontedaria cordata


0.31 -


90% 70% 50% 30% 10%


Sambucus canadensis


Rubus sp.


90% 70% 50% 30% 10%

 Thelypteris spp.


90% 70% 50% 30% 10%
 Light transmittance (%)


 0.5

 0.4

0.3

S0.2

 0.1

 0



 1

 0.8

S0.6

0.4

 0.2

 0


Figure 7.9 (Cont.) The Frequency of Occurrence of Understory Species (< 1m in
 Height) Under Varying Light Transmittance Classes. Those
 Species Occurring at a Minimum of Ten Sampling Points
 Throughout the Chrono-Sequence of Wetlands Are Presented.
 The X-Axis Is in Reverse Order So That Species Occurring
 Under Low Light Transmittance Levels Occur on the Right.


7-55


90% 70% 50% 30%


90% 70% 50% 30% 10%
 Light transmittance (%)


~