Moluscos terrestres nativos y exóticos del Archipiélago Juan Fernández (AJF) (Mollusca: Gastropoda)

Abstract

The terrestrial mollusks bibliographic revision cited from JFA was complemented with material obtained from collections made during: February-March, 1997 (Expedición Islas Oceánicas de Chile, IOC- National Geographic, R/V Carlos Porter); 5-12 November, 2005 (Expedición MNHNCL al AJF); 16 and 17 December 2008 (AP-41 Aquiles), and 7-8 December 2013 (LSDH-91 Sargento Aldea). In the last visit to the JFA, an exhaustive gasteropods collection was made in Robinson Crusoe Island, which allowed the confirmation of the existence of a native Family, Tornatellinidae, with specimens from the native genus Fernandezia, found in more open and wild areas, associated to the ferns from the genus Blechnum, also native from the island. Also, specimens belonging to the three alien following Families were found, mainly in urban areas: Limacidae (Deroceras), Zonitidae (Oxychilus) and Helicidae (specimens of Cornu (Helix) aspersum). The small agriculture favors the dispersion and incoming travel of exotic invertebrates. Some relationships between native plants/native mollusks and exotic plants/exotic mollusks is proposed. The existence of a fringe without terrestrial mollusks in the area flooded by the February 27, 2010 tsunami, could mean that the soil salinity is so high because of the tsunami that it would be impeding the terrestrial mollusks settlement in this area. There are six Families of terrestrial mollusks in the JFA, three of them are native Families: Endodontidae, Succineidae and three Families with alien species: Helicidae, Limacidae and Zonitidae.