Invasive species are a major global threat to biodiversity and Pacific Islands are particularly vulnerable due to their isolation and relatively recent human occupation. Their native species cannot cope with predation or competition from new arrivals. Niue already suffers from the impact of invasive species that have arrived in the country. However there are many more devastating species that are not present but found in other countries of the region and every effort needs to be made to prevent their arrival.

The origin of this Action Strategy lies in the RETA (Regional Environmental Technical Assistance Project). No. 5403. funded by the Office of ihe Environment of the Asian Development Bank and executed by the South Pacific Regional Environment Programme. The Kingdom of Tonga was one of five countries which agreed to participate in a regional programme directed at strengthening the environmental management capabilities of Pacific Island member countries of the Asian Development Bank.

Water lettuce is a free floating aquatic plant in rosettes of green leaves, rosettes occuring singly or connected to others by short stolons whose origins are uncertain. It forms large, dense floating mats. The plant can adapt to life in ponds, dams, lakes and quiet areas of rivers and streams, but cannot withstand salt water. Still continue with observation whether it is to survive in winter.

The biodiversity within the Solomon Island's geographical and political boundary are continuously under pressure from habitat destruction, overexploitation, waste, invasive species and climate change. Capacity constraints emanating from the absence of biodiversity values, institutional constraints, inadequate finance and the lack of scientific information are consequently undermining effort to lessen these pressures on biodiversity.

La Convention pour la Diversite Biologique (CBD) developpee en 1992 lors du sommet de l'Organisation des Nations Unies a Rio de Janeiro reflete la reaction de la communaute mondiale face a l'erosion acceleree de la biodiversite mondiale.

Pacilic island countries are particularly vulnerable to the effects of invasive species. After habitat destruction or modification, invasive species are responsible for more species extinctions than any other cause. Further, the rate of extinction of native species has been higher on islands than anywhere else in the world. Invasive species have also degraded native ecosystems.