Ecology of the invasive New Zealand mud snail, Potamopyrgus antipodarum (Hydrobiidae), in a mediterranean-climate stream system

摘要: The New Zealand mud snail, Potamopyrgus antipodarum, is a widely distributed non-native species of management concern on four continents. In southern California stream, P. antipodarum abundance, which ranged from ca. <10 to nearly 150,000 snails m−2, was related discharge and temperature patterns. Laboratory experiments indicated that (1) survivorship decreased 13 27°C, but its growth rate higher at 20°C than 27°C; (2) grazing rates were similar those native algivores in short-term trials; (3) impact greater hydrobiid snail longer-term (4) ingested different diatom sizes some other grazers; (5) reduced the abundances medium-sized large diatoms, several filamentous cyanobacteria chlorophytes, while increasing relative tough chlorophytes (e.g., Cladophora); (6) invertebrates specific, ranging competition facilitation; (7) Anaxyrus boreas tadpoles; (8) consumed by Procambarus clarkii naiads Aeshna Argia. Ecological effects introduced P.antipodarum are subtle, occurring primarily transitory high densities, flow regulation may enhance their eliminating flows reduce population sizes.