What are invasive non-native species?
Invasive non-native species are those which are not native to the UK and spread rapidly in the wild after introduction as they have no natural predators or ecologically limiting factors. These species often cause a decline in native species for a number of reasons, including increased competition for habitat and food. About this indicator The indicator will look at distribution in selected species, and any changes over time. Assessment of invasive non-native plant species in London include: • Floating Pennywort was first introduced into the UK the 1980s. In some cases this weed can completely cover the river channel. This can lead to a decline in native plant species and deoxygenate the water, killing aquatic life. Weed cover can also restrict flow and cause flood risk issues. • Japanese Knotweed was first introduced into the UK in the mid 19th century. This plant grows on the river bank and colonises rapidly using its roots (its seeds are not presently viable in the UK). Its ability t
