Table 5. Pairwise interactions between predictor variables used to relate total biomass and occurrence of each taxa to environment.

Taxa	Predictor	Predictor	Interaction value	Interaction Summary
Total Biomass	Depth	Temperature	0.03	Deeper Depth+Higher Temp = Higher Biomass
CAAB	(BHM_Structure)	Temperature	32.31
	Depth	Human Population	28.25	Depth >15 m+0 people = More CAAB
CAME	% CCA	Depth	11.78	Depth >20 m+CCA >20% = More CAME
	(BHM_Structure)	Depth	7.64
CHUD	NA	NA	NA	To few samples to model interactions
LUBO	Wave Energy	Temperature	25.12	Temp <27 or >29+Higher Wave Energy = More LUBO
	Depth	(Island Quardrant)	9.17
MASP	NA	NA	NA	To few samples to model interactions
NAHE	Distance to Deep Water	(BHM_Structure)	20.82
	Distance to Deep Water	(BHM_Cover)	6.62
SCRU	Wave Energy	Depth	27.61	Shallow depth+low to moderate Wave Energy = More SCRU
	% Sand	Wave Energy	11.92	% Sand <20+Wave Energy between 100 & 200 = More SCRU
TROB	Depth	Human Population	20.99	Depth >15 m+0 people = More TROB
	Wave Energy	Human Population	4.17

Interactions displayed are the top two for each taxonomic group (based on value) that involved the 8 predictors offering the highest contribution to the model displayed in Figure 5 . Only one interaction is displayed for Total Biomass as none of the lower interactions had values greater than 0.01. Interaction value indicates the relative degree of departure from a purely additive effect; with a value of zero indicating that no interaction is present. A summary description is given for the association of the peak in each of 9 taxonomic groups and the pairwise interactions for those predictor variables showing a clear relationship (for example positive, negative, or modal) with the taxa in Figure 5 .

Categorical variables are noted with “()”.

NA indicates sample sizes insufficient to model interactions.