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Nelson WY Lam, Richard Huang, and Benny KK Chan (2009) Variations in intertidal assemblages and zonation patterns between vertical artificial seawalls and natural rocky shores: a case study from Victoria Harbour, Hong Kong. Zoological Studies 48 (2): 184-195. Development of coastal cities often results in destruction of natural coastlines, which are consequently replaced by artificial coastal urban structures, commonly including smoothly surfaced vertical seawalls. Artificial seawalls can create novel habitats which may affect the diversity, abundances, and distribution patterns of intertidal assemblages. In the present study, the intertidal assemblages on 3 vertical artificial seawalls and 3 natural rocky shores were studied in Victoria Harbour, Hong Kong. Both artificial seawalls and natural rocky shores shared similar assemblages of common species, but the species abundance and percentage cover of certain taxa differed between the 2 habitat types. Artificial seawalls supported a greater abundance of the chiton Acanthopleura japonica and greater percentage coverage of the oyster Saccostrea cucullata and barnacle Amphibalanus (= Balanus) amphitrite. In contrast, a greater abundance of the false limpet Siphonaria laciniosa and a greater percentage cover of the barnacle Tetraclita squamosa occurred on natural rocky shores. Some species were found exclusively on only one of the habitats. The green mussel Perna viridus, tube worms Hydriodes spp., and sea squirt Styela sp. were only found on artificial seawalls, while the black mussel Septifer virgatus was exclusively recorded on natural rocky shores. Artificial seawalls had different …