100 -i 



80 



c 

 a> 



c 

 o 

 o 

 o 



c 

 a 

 at 



60 - 



40- 



Floating 



Interior Quaking 



Firm Non- Floating with 

 Sediment Source 



20 

 0.000 



1 



0.300 



0.100 0.200 



Bulk Density 



Figure 6. Cluster analysis of bulk density and percent organic for stations in Jean Lafitte 

 National Park. V represents cluster means and ellipses represent two standard deviations 

 around the means. 



Water and Marsh Level Changes 



Ranges of annual vertical water level changes revealed that (1) there were no significant 

 differences in monthly water level ranges between canal sites and water over marsh sites, (2) canal 

 sites had water level changes grouped at the upper end of the range of yearly water level changes, 

 (3) marsh sites exhibited yearly water level changes with a range of 24-36 cm, (4) the lakeside 

 station (site 5) and the impounded swamp (site 18) exhibited the lowest yearly water level ranges, 



257 



