Table 3.

Least-squares means (± s.e.) of the maximum helophyte depths achieved in the seven classes generated by the regression tree analysis (see Fig. 2), with descriptions of the classes and their constituent species

Class	Max depth	Class description	Species
A	0·56 ± 0·04	Flow absent species	All As and Ea records
B	0·87 ± 0·06	Eutrophic, very low water clarity	Exclusively To
C	2·16 ± 0·14	Eutrophic, clearer water, sheltered	Exclusively Es
D	1·00 ± 0·22	Eutrophic, clearer water, exposed	Bat, Es, To
E	2·26 ± 0·10	Oligotrophic, sheltered	Bat, Es, St
F	1·61 ± 0·15	Oligotrophic, exposed	All five species with flow
G	0·70 ± 0·05	Microtrophic Lake Taharoa	Bat, Es, To

Species codes: As = Apodasmia similis, Bat = Baumea articulata, Ea = Eleocharis acuta, Es = Eleocharis sphacelata, St = Schoenoplectus tabernaemontani, To = Typha orientalis.