Asch and Collie: Changes in a benthic megafaunal community due to disturbance from bottom fishing 
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Table 3 
(A) Effects of disturbance from mobile fishing gear and year on the composition of noncolonial organisms at deep sites. In this 
two-way crossed analysis of similarity (ANOSIM) test, the sample global R is the test statistic. Data were permuted 9999 times 
to generate an empirical frequency distribution for global R. Significance levels: *P<0.05; ***P<0.001. (B) Similarity of percent- 
ages (SIMPER) results identifying species that are characteristic of disturbed and undisturbed sites at the deep depth stratum. 
Cumulative percentage refers to the contribution that species make to the cumulative similarity within each group or the cumu- 
lative dissimilarity between these groups. Results are presented in terms of similarity among disturbed transects, similarity 
among undisturbed transects, and dissimilarity between disturbance groups. 
A ANOSIM results 
95th percentile 
Factor 
of permuted global R’s 
Sample global R 
Disturbance 
0.25 
0.28* 
Year 
0.11 
0 4i*** 
B SIMPER results 
Similarity amongst disturbed transects 
Mean density 
Cumulative 
Scientific name 
per photograph 
percentage 
Astarte spp. 
0.55 
21.75 
Pagurus spp. 
0.55 
42.10 
Caridea unident. 
1.03 
59.65 
Gastropoda unident, (shelled) 
0.48 
70.37 
Zoantharia unident. 
0.23 
79.04 
Placopecten magellanicus 
0.15 
86.93 
Similarity amongst undisturbed transects 
Mean density 
Cumulative 
Scientific name 
per photograph 
percentage 
Zoantharia unident. 
1.74 
35.80 
Astarte spp. 
0.64 
47.03 
Pagurus spp. 
0.44 
55.14 
Caridea unident. 
3.52 
62.44 
Modiolus modiolus 
0.53 
69.59 
Gastropoda unident, (shelled) 
0.39 
76.16 
Hyas coarctatus 
0.33 
81.47 
Dissimilarity between disturbance groups 
Mean density 
Mean density 
Cumulative 
Scientific name 
at disturbed sites 
at undisturbed sites 
percentage 
Zoantharia unident. 
0.23 
1.74 
11.32 
Caridea unident. 
1.03 
3.52 
20.25 
Astarte spp. 
0.55 
0.64 
26.33 
Modiolus modiolus 
0 
0.53 
32.24 
Thelepus cincinnatus 
1.14 
0.25 
38.12 
Pagurus spp. 
0.55 
0.44 
43.90 
Gastropoda unident, (shelled) 
0.48 
0.39 
49.52 
Hyas coarctatus 
0.05 
0.33 
53.97 
Ophiuroidea unident. 
0.05 
0.75 
58.34 
Polychaeta unident, (tubicolous) 
0.29 
0.33 
62.68 
