160
T.-S. Chon . Y.S. Park' L-S. Kwak . E.Y. Cha
~ 1.0
'"
= f 0.8
;;
.e- 0.6
= o
"ö 0.4
=
·ß 0.2
.~
~ 0.0
:: 1.0
'" = f 0.8
;;
.e- 0.6
= o
'ö 0.4
·
.~ 0.2
'0
~ 0.0
Organic maUer
~(T
0.0
0.2
0.4
0.6
0.8
1.0
0.0
0.2
0.4
0.6
0.8
1.0
Observed vaIues
OChironomidae
DOdonata
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.2
0.4
0.6
0.8
1.0
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.2
0.4
0.6
0.8
1.0
Observed vaIues
eChironom 116
... Oligochaeta
~Hirudinea
OGastropoda
~ 1.0
:
Organic matter
f 0.8
;;
8' 0.6
= o
"ö 0.4
•
.,g 0.2
'e
-t 0.0
~ 1.0
'"
· f 0.8
=
B- 0.6
= o
'0 0.4
•
.g 0.2
·
~ 0.0
0.0
0.2
0.4
0.6
0.8
1.0
Velocity
0.0
0.2
0.4
0.6
0.8
LO
Observed values
QChironomidac
OOdonata
1.0
0.8
0.6
0.4
0.2
0.0
0.0
1.0
0.8
0.6
0.4
0.2
0.0
Depth
0.2
0.4
0.6
0.8
1.0
Substrates «5mm)
0.0
0.2
0.4
0.6
0.8
1.0
Ob s erve d value s
.Baetis
b
eChironom 11$
AOIjgochaeta
6 Hirudinea
OGastropoda
Fig. 8.17. Variation of output ranges in densities of selected taxa in benthic
macroinvertebrate community when input values ranging +50 % and -50 % were
provided to different environmental variables for the data of July 1997. (Variation
was expressed as standard deviation of 11 observations.) (From Chon et al. 2001).
a) July 1997. b) November 1997.