Table 2.

Environmental variables selected using Generalized Additive Models (Rockall Bank and Acesta Wall) or Generalized Linear Models (Coral Wall): Structure from Motion reconstruction (SfM), ROV and AUV multibeam echosounder (MBES). The superscripts indicate the number of samples (n) and folds used. TRI: Terrain Ruggedness Index, TPI: Topographic Position Index, G. Roughness: Gaussian roughness as calculated from CloudCompare, SA Ratio: Surface-Area Ratio, MSE: Mean square error.

	Site	Model	Variables Selected	R2	MSE
Abundance  (log + 1)	Rockall Bank	SfM1	SA Ratio and Slope 0.05 m	0.29	0.89
		MBES ROV1	Slope 10 m, Roughness 50 m, Northness 50 m, TRI 05 m and G. Roughness 25 m	0.65	0.74
	Coral Wall	SfM2	SA Ratio, Slope 0.02 m, G. Roughness 0.02 m and Northness 0.1 m	0.77	0.19
		MBES ROV3	ROV TPI 05 m and G. Roughness 25 m	0.39	0.55
		MBES AUV3	TPI 50 m	0.23	0.44
	Acesta Wall	SfM4	Eastness 0.02 m, Slope 0.02 m and Northness 0.05 m	0.55	0.95
		MBES ROV5	Slope 10 m, G. Roughness 50 m, Entropy 25 m, Eastness 05 m and Northness 25 m	0.64	0.69
		MBES AUV5	Slope 25 m, Entropy 10 m, Northness 10 m and Eastness 05 m	0.63	0.84
Number of Species	Rockall Bank	SfM1	G. Roughness 0.05 m, Eastness 0.02 m and Slope 0.1 m	0.28	10.49
		MBES ROV1	Depth, Eastness 50 m, Northness 5 m and G. Roughness 05 m	0.58	6.06
	Coral Wall	SfM2	SA Ratio and G. Roughness 0.1 m	0.40	10.44
		MBES ROV3	TRI 25 m, G. Roughness 25 m and G. Roughness 10 m	0.51	8.30
		MBES AUV3	Not Significant	NA	NA
	Acesta Wall	SfM4	G. Roughness 0.05 m, Northness 0.02 m and Eastness 0.05 m	0.64	6.01
		MBES ROV5	Slope 25 m, Roughness 25 m, Northness 50 m, G. Roughness 10 m and Northness 10 m	0.71	4.87
		MBES AUV5	Slope 10 m, Eastness 10 m, Entropy 10 m and G. Roughness 25 m	0.71	4.82
Diversity (1/D)	Rockall Bank	SfM1	Eastness 0.1 m, SA Ratio and Northness 0.05 m	0.37	0.03
		MBES ROV1	TPI 50 m, Eastness 50 m, Northness 05 m and TRI 25 m	0.44	0.03
	Coral Wall	SfM2	Slope 0.02 m, G. Roughness 0.02 m And Eastness 0.05 m	0.51	0.02
		MBES ROV3	TRI 25 m, Roughness 25 m and Northness 50 m	0.44	0.05
		MBES AUV3	Not Significant	NA	NA
	Acesta Wall	SfM4	Northness 0.02 m, Slope 0.02 m and Northness 0.1 m	0.35	0.05
		MBES ROV5	TRI 05 m, G. Roughness 10 m and TPI 50 m	0.44	0.03
		MBES AUV5	Roughness 25 m, Eastness 50 m, TRI 25 m and Depth	0.47	0.03

¹n = 94, folds = 5, ²n = 24, folds = 3, ³n = 28, folds = 3, ⁴n = 225, folds = 10, ⁵n = 175, folds = 8.