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Pygospio elegans size distribution - The P. elegans size-frequency distributions from
the unmanipulated control and weed treatment plots after 6 weeks and 20 weeks are
shown in Figures 4.6(i-ii) and the X 2 goodness of fit and Kolmogorov-Smirnov tests
results are presented in Table 4.1.
The results suggest that after 6 weeks of weed cover, although there was no significant
difference between the size distributions of P. elegans in the weed treatment plots
compared to the unmanipulated control plots, the significant decrease in abundance in
the weed treatment (Figure 4.3(ii)) was mainly due to both the smallest individuals,
0.33mm 5th setiger width (38.8% of total variation), and those individuals with 5th
setiger widths between 0.50 and 0.53mm (46.6%). However, caution must be taken
because of the low abundances in the weed treatment plots.
30 —
25 —
20 —
'5-
10 —
35 —
30 —
25 —
a-,
C' 20 —
'A
,L2 15 —
10 —
5 —
0
5 —
0
INE II • ,
0
Ci
NJ r•I
6
(i) 6 Weeks
Fifth setiger width (mm)
OD 20 Weeks
I , 111 ,111,111, , II
0 en
en en en
6 6 06 6
Fifth setiger width (mm)
0 en N 0 en
0 control, n=145
• weed, n=40
o control, n=275
• weed, n=75
0 t•-• 0 r—
N.0
6 6 6 6 6 6
Figures 4.6(i-ii) : Size-frequency results of P. elegans from control and weed
treatment plots after 6 and 20 weeks. Total number of individuals measured for each
treatment is given in legend.
99
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rs:
r-