In this study, we measured univariate and multivarite metrics of mobile
invertebrate assemblages along the midlittoral vertical range of four
replicate rocky shores, aiming a control habitat (barnacle cover) and a
facilitated habitat (barnacle cover plus a secondary mussel cover). At any
given shore height, differences between assemblages would indicate
realized facilitation. Temperature and desiccation potential increase from
the bottom to the top of this range, and increased facilitation higher on
the shore would support the stress-gradient hypothesis. Along with
invertebrate data, we provide key environmental data at study sites that
could underlie any spatial structure on top of local vertical trends.