vegetation cover

Characterising alligator weed (Alternanthera philoxeroides; Amaranthaceae) invasion at a northern New Zealand lake

Exotic plant invasions are a key threat to New Zealand biodiversity. Alligator weed (Alternanthera philoxeroides; Amaranthaceae) is an invasive, herbaceous weed native to South America. Little is known about its dynamics in natural ecosystems in its introduced range, despite known agricultural impacts. We quantified alligator weed infestation at Lake Rotokawau, Northland, and investigated alligator weed’s relationship with other vegetation, both native and exotic, over a year (Nov. 2005 to Sep. 2006).