Establishment and ecological integration of the New Zealand mud snail in Spirit Lake, Mount St. Helens, Washington State, USA

Carbon and nitrogen stable isotope (δ13C and δ15N) values of abundant and common groups of aquatic organisms in the Spirit Lake food web. Snail species = invasive, non-native NZMS (P. antipodarum) and native G. deflectus. Insect larva = Chironomidae, Ephemeroptera, Odonata, Plecoptera, Trichoptera. Aquatic mites = Hydrachna sp.. Amphibian tadpoles = Anaxyrus boreas. Ellipses are defined by mean δ13C and δ15N values ± standard deviations.