APPENDIX 3 



TAXONOMIC GROUPS USED IN STEPWISE REGRESSION PROCEDURES 



(Taxonomic acronyms are defined in Appendices 1 and 2.) 



Key to trend in diatom representation over range of macrophyte 



variable 

 i = increasing over range 

 ic = increasing in curvilinear fashion 

 d = decreasing over range 

 dc= decreasing in curvilinear fashion 

 u = uniform over range 



3.1. Predicting percent-volume infestation from diatom percentage 

 data beginning with 17 diatom taxonomic groups. 



Acronym of taxonomic group Trend 



ACHEX d 



S-AST d 



S-AULAGR d 



AULAITAL d 



CYMLUN i 



EUNCUR i 



FRAGBREV d 



S-GOMA i 



S-NAVPU i 



NAVLAN d 



NAVRA d 



NAVSUBT d 



NITZAM d 



S-PIN d 



S-STAU i 



S-SUR d 



SYNDEL d 



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