[n = 6]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | North America | UK | not established | unknown |
| 1960 - 1969 | Denmark | Sweden | established | |
| 1870 - 1889 | Unknown | New Zealand | not established | |
| 1955 | USA | Morocco | not established | |
| 1962 | USA | Denmark | not established | |
| 1980 | USA | Cyprus | not established |