Karpov 81

0 5000 10000 15000 20000

Biota

Hardpan

Rock Gravel Matrix

Rock Sand Matrix

Sand

Sediment

Turf

Number of Positions

Rock Boulder RockSand 1

RockSand 2 RockSand 3 Sand

Biota

29%

0%

66%

5% 0%

Hardpan

8% 0%

40%

10%7%

35%

Rock Gravel Matrix

13%

13%

31%

18%4%

21%

Rock Sand Matrix

3% 0%

71%

26%

Sand

21%

4%

14%

11%22%

28%

Sediment

0%4% 4%14%

78%

Turf

58%

10%

7%

13%

9% 3%

Rock Boulder RockSand 1

RockSand 2 RockSand 3 Sand

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.

Karpov 82

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 83

25

0 10 20 30 40 50 Meters

N

2 m bathymetry contours

Modified Primary Substrate

Rock

RockSand1

RockSand2

RockSand3

Sand

Video segment with prominentrock feature classified

as high relief rock substrate

Distance betweenobserved feature and

mapped feature is 63 meters

Direction ofROV movement

Large Rock

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.

Karpov 84

0 100 200 300 400 Meters

25

29

37

30

36

38

31

PGER Boundary

2 m bathymetry contours

Bathymetry

10m

20m

30m

40m

50m

Relief (meters)

< 1

1 - 3

> 3

Modified Primary Substrate

Rock

RockSand1

RockSand2

RockSand3

Boulder

Sand

Sand Grain Texture

fine

medium

coarse

Substrate Classification

boulder

boulder field

coarse matrix

coarse sediment

fine matrix

fine sediment

rock outcrop

sediment ripples

unknown reef

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).

Karpov 85

0 100 200 300 400 Meters

29

31

26

25

Sand

Boulder

RockSand3

RockSand2

RockSand1

Rock

Modified Primary Substrate

> 3

1 - 3

< 1

Relief (meters)

50m

40m

30m

20m

10m

Bathymetry

2 m bathymetry contours

PGER Boundary

Sand Grain Texture

fine

medium

coarse

Substrate Classification

boulder

boulder field

coarse sediment

fine matrix

fine sediment

rock outcrop

sediment ripples

unknown reef

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).

Karpov 86

0.00 0.01 0.02 0.03 0.04

Distances

Rock

Boulder

Rock Sand 1

Rock Sand 2

Rock Sand 3

Sand

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.

Karpov 87

0.00 0.01 0.02 0.03 0.04 0.05 0.06

Distances

Hexagrammos

decagrammus

Ophiodon elongatus

Pleuronectiformes

Juvenile Sebastes

Sebastes caurinus

Sebastes maliger

Sebastes melanops

Sebastes mystinus

Sebastes pinniger

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.

Karpov 88

Juvenile Sebastes

Sebastes mystinus

Pleuronectiformes

Ophiodon elongatus

Sebastes caurinus

Sebastes maliger

Sebastes melanops

Hexagrammos

decagrammus

Sebastes pinniger

0.000.020.040.060.080.100.12

RockBoulder

Rock S

and 1

Rock S

and 2

Rock S

and 3

Sand

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).