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Fishery Bulletin 106(4) 
Deep sites 
Filograna implexa Encrusting bryozoans 
Hydroids 
Bushy bryozoans 
Sponges 
Cultch frequency 
Figure 4 
Temporal trends in colonial epifaunal percent cover and cultch percent frequency at deep sites (80 — 
90 m). Trend lines from sites that are either disturbed or undisturbed by bottom fishing are shown. 
Data representing deep, disturbed sites originated from sites 10 and 13, and data representing 
deep, undisturbed sites were primarily from site 20, but also included a few unfished transects 
from sites 10 and 13. The scale of the y axis varies between graphs of different epifaunal taxa. 
Markers (i.e. , black squares and black diamonds) are back-transformed means, and error bars are 
95% confidence intervals. Different letters above data points represent annual means that differed 
significantly from each other in multiple comparison tests. F statistics from two-way analyses of 
variance (ANOVAs) on the effects of disturbance ( dist ), year (yr), and disturbance x year ( distxr ) 
are shown below each graph ( df= 1,2,2). Significance levels from ANOVA tests are indicated as 
follows: ? * P<0.10; *P<0.05; **P<0.01. There are no lines connecting data from 1998 and 1999 at 
deep, undisturbed sites because the 1999 data were not included in two-way ANOVAs. 
shallow transects in terms of noncolonial megafaunal 
abundance were apparent when we examined MDS plots 
(Fig. 5A). Compared to the evident effect of depth on 
noncolonial species composition, the influence of bottom- 
fishing disturbance in MDS plots was subtle. Transects 
recorded at disturbed site 18 could be distinguished 
from transects at all other shallow sites. Relatively few 
differences in noncolonial species composition could 
be seen among sites 16, 17, and 17W (Fig. 5B). At the 
deep depth stratum, disturbed sites 10 and 13 generally 
exhibited a community composition that was distinct 
from undisturbed site 20, as indicated by the position- 
ing of disturbed transects to the left of the MDS plot 
(Fig. 5C). The two transects from site 13 that were more 
interspersed among transects from site 20 in the MDS 
were filmed in the northwestern extent of this study site, 
which was subjected to less bottom-fishing pressure. The 
greater dispersion of deep, undisturbed transects across 
the MDS revealed a wider variation in species composi- 
tion at site 20 than at other deep sites. 
