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We compared epifaunal and epiphytic assemblages on the invasive alga,  Codium fragile  ssp.  tomentosoides , with those on native kelps,  Laminaria  longicruris  and  L. digitata , at a moderately exposed site on the Atlantic coast of Nova Scotia. Thalli of each algal host ( Laminaria  and/or  Codium ) were sampled in two stands with monospecific canopy cover and one mixed canopy stand ( Laminaria  and  Codium ) in June and November 2004 and February 2005. Epifaunal assemblages on both fronds and holdfasts differed between algal species and among months, but no differences were detected between mixed and monospecific stands for each host type. Fronds of  Laminaria  supported greater densities of gastropods and asteroids, while amphipods, harpacticoid copepods, and a specialist herbivore ( Placida dendritica ) were more abundant on fronds of  Codium . Holdfasts of  Codium  supported greater densities of nematodes and bivalves. Diversity of epifauna was greater on fronds of  Codium  than  Laminaria  and similar on holdfasts of both species.  Codium  supported a greater density of epiphytes than  Laminaria . Total frond area of  Laminaria  and/or  Codium  and density of epifauna per m 2  of substratum did not differ between stands. Our results suggest that habitat selection by epibionts is likely determined by specific chemical, structural and morphological characteristics of the algal species, rather than the amount of habitable area available for colonization.

botanica marina

A comparison of epifauna and epiphytes on native kelps ( Laminaria  species) and an invasive alga ( Codium fragile  ssp.  tomentosoides ) in Nova Scotia, Canada