Rock Boulder RockSand 1 RockSand 2 RockSand 3 Sand

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1 Figure 15. Histogram comparison of ROV observed primary substrates determined from 33,605 dgps positions to RoxAnn seabed classification. Pie charts represent the percentage of ROV modified primary substrate type to each RoxAnn substrate classification. Number of Positions Biota Hardpan Gravel Matrix Matrix Sediment Turf Boulder Biota Hardpan Gravel Matrix 5% 0% 29% 35% 8% 0% 18% 13% 21% 4% 66% 0% 7% 10% 40% 31% 13% Matrix Sediment 26% 3% 0% 28% 21% 4% 0%4% 4% 14% 71% 22% 11% 14% 78% Turf 13% 9% 3% 7% 10% 58% Boulder Karpov 81

2 Figure 16. All ROV transects and SCUBA transects performed at PGER with transect code number superimposed over grayscale sidescan sonar mosaic image. Darker gray indicates stronger sonar return and harder substrate. Karpov 82

3 Figure 17. Displacement error observed between ROV positions and sidescan sonar image. Colored bars represent the ROV usable substrate segments classified by modified primary substrate type. Red bar represents the potential displacement (63 m) from an object (large rock) that can be identified from both information sources. Direction of ROV movement 25 Video segment with prominent rock feature classified as high relief rock substrate Distance between observed feature and mapped feature is 63 meters Large Modified Primary Substrate N m bathymetry contours Meters Karpov 83

4 Figure 18. ROV based modified primary substrate classifications overlaid on bathymetry and sidescan sonar mosaic interpretation of substrate classifications for the northern portion of PGER. ROV transect lines include segment information on substrate type (inside portion of line), relief (middle portion of line) and sand grain texture (outside portion of line) Modified Primary Substrate Boulder Relief (meters) < > 3 Grain Texture 25 fine medium coarse Bathymetry 10m 20m 30m 40m 50m 2 m bathymetry contours PGER Boundary 31 Substrate Classification boulder boulder field coarse matrix coarse sediment fine matrix fine sediment rock outcrop sediment ripples unknown reef Meters Karpov 84

5 Figure 19. ROV based modified primary substrate classifications overlaid on bathymetry and sidescan sonar mosaic interpretation of substrate classifications for the central and southern portion of PGER. ROV transect lines include segment information on substrate type (inside portion of line), relief (middle portion of line) and sand grain texture (outside portion of line). 31 Modified Primary Substrate Boulder Relief (meters) < > 3 Grain Texture fine medium coarse Bathymetry 10m 20m 30m 40m 50m 2 m bathymetry contours PGER Boundary Substrate Classification boulder boulder field coarse sediment fine matrix fine sediment rock outcrop sediment ripples unknown reef Meters Karpov 85

6 Figure 20. Dendrogram of hierarchical cluster analysis of modified primary substrates using the weighted fish densities of the nine most abundant species (columns). Distinct clusters are represented by different colored branches. Boulder Distances Karpov 86

7 Figure 21. Dendrogram of hierarchical cluster analysis of weighted densities of the nine most abundant fish species by modified primary substrates (rows). Distinct clusters are represented by different colored branches. Juvenile Sebastes Sebastes mystinus Pleuronectiformes Ophiodon elongatus Sebastes caurinus Sebastes maliger Sebastes melanops Hexagrammos decagrammus Sebastes pinniger Distances Karpov 87

8 Figure 22. Permuted data matrix of hierarchical cluster analyses of weighted densities of the nine most abundant fish species by modified primary substrates (matrix, both columns and rows, simultaneously). Distinct clusters in dendrograms are represented by different colored branches. The number of cutpoints was determined by an algorithm in the clustering program (SYSTAT 2000). Juvenile Sebastes Sebastes mystinus Pleuronectiformes Ophiodon elongatus Sebastes caurinus Sebastes maliger Sebastes melanops Boulder Hexagrammos decagrammus Sebastes pinniger Karpov 88