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The article examines interspecific competitive strengths and survival and growth rates between the tunicate Pyura praeputialis and the mussel Perumytilus purpuratus at mid-low and mid-upper intertidal fringes in Chile's Bay of Antofagasta. It was found that the survival and growth rates of the invading P. praeputialis were not significantly affected by the presence of the native P. purpuratus in the mid-low fringe. Survival of P. praeputialis was decreased by the presence of P. purpuratus at the mid-upper intertidal fringe. The role of P. praeputialis in modifying the zonation pattern in the bay is also addressed.

The article investigates the effects of coastal coseismic uplifts and the 2010 Chilean mega-earthquake on intertidal biomarker species. The mean coseismic uplift on the Gulf of Arauco, Santa Maria Island and the Bay of Concepción is measured. Intertidal rocky shore and shallow subtidal edible/commercial species that were found stranded at the uplifted areas include Concholepas concholepas, Fissurella spp, Pyura chilensis, Rhodymeniales Sarcothalia sp. and the Ceramiales Chondracanthus sp.