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We assessed macrofaunal polychaete species diversity on the West Antarctic Peninsula at mean depths of 500 to 600 m along a cross-shelf transect near Anvers Island, Antarctica. Fifteen megacore samples from 3 sites were analysed to species level, revealing 78 polychaete species of which several are new to science. Quantitative samples allowed an assessment of species abun- dances and the relative contribution of dominance to overall species diversity. The composition of the assemblages varied across the shelf: the 2 outermost stations on the transect were relatively similar but differed from the innermost station, which had higher diversity and major differences in species composition, possibly linked to changes in the sediment characteristics and degree of food availabil- ity. Species diversity, measured by rarefaction, evenness and species richness estimators, was similar to values reported at other bathyal settings and slightly higher than that reported from the Arctic shelf, but in general lower than that reported at temperate and tropical abyssal sites. Dominance was much higher at Antarctic deep-shelf sites in comparison to temperate bathyal and abyssal sites.

Polychaete species diversity on the West Antarctic Peninsula deep continental shelf