Table 2.

The intercept, slope, marginal coefficient of determination (R²), and p-values of linear mixed-effect models testing the effect of giant kelp biomass (kg m⁻² dry mass) on species richness of the entire community and four functional groups. Year (fixed) and site (random) factors were also included in the model; coefficients represent the effect of kelp only. We also considered these relationships including only the subset of giant kelp-associated species (GKA) as defined by Graham [16] for each group. Here n is the number of species in each group. Significant relationships are bolded.

	n	intercept	slope	R2	p
total community	205	−618.01	4.91	0.037	<0.001
GKA community	51	−374.37	3.43	0.095	<0.001
macroalgae	58	−402.43	0.82	0.051	0.047
GKA macroalgae	18	−317.18	1.48	0.106	<0.001
sessile invertebrates	68	−138.35	3.33	0.044	<0.001
GKA sessile invertebrates	18	−19.32	1.35	0.066	<0.001
mobile grazers	16	36.98	−0.23	0.004	0.083
GKA mobile grazers	4	−5.46	0.02	0.002	0.544
mobile predators	60	−126.48	1.49	0.023	<0.001
GKA mobile predators	11	−31.34	0.57	0.018	<0.001