Appendix X: Year 1 results: feeding ecology of the introduced predatory snail Euglandina rosea Feeding ecology of the introduced predatory snail Euglandina rosea (Férussac) in Hawai‘i: implications for the preservation of native land snail species

Introduction The introduction of the land snail Euglandina rosea, which feeds exclusively on snails, has been implicated as a major factor influencing the decline of the native Hawaiian land snail fauna (Hadfield 1986). It was introduced to Hawaii in 1955 to control populations of another introduced snail, Achatina fulica, the giant African snail (Davis & Butler 1964, Simberloff 1995, Civeyrel & Simberloff 1996, Cowie 2001). However, E. rosea has not reduced A. fulica populations (Civeyrel & Simberloff 1996, Cowie 2001) but it has been associated with the decline of many of the tree snail species, not only in Hawaii but also elsewhere in the Pacific (Hadfield & Mountain 1980, Clarke et al. 1984, Hadfield 1986, Murray et al. 1988, Hadfield et al. 1993, Murray 1993, Coote & Loève 2003), and may be the cause of the extinction of many other native land snails (Griffiths et al. 1993, Cowie 1998, 2001).