Invasive Species

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.

Invasive alien species are recognised as one of the leading threats to biodiversity and also impose enormous costs on agriculture, forestry, fisheries, and other human enterprises, as well as on human health. Rapidly accelerating human trade, tourism, transport, and travel over the past century have dramatically enhanced the spread of invasive species, allowing them to surmount natural geographic barriers. Not all non-indigenous species are harmful. In fact the majority of species used in agriculture, forestry and fisheries are alien species.

It may be possible to tell that a species is likely to be invasive, for example because it has been a problem elsewhere. However it will be difficult to say with certainty that a

Early settlers brought in animals (e.g. cattle, pigs, goats, cats, chickens and dogs) for food, pets and hunters for their survivals. Some of the animals were not well managed that they become wild (feral) and become problems. Feral pigs, cattle, goats tramp and graze on forest plants and garden crops that may result in desertification in some areas. Their manure deposits in water cause algal growth that makes water bodies look dirty. Feral and domesticated cats and dogs kill native birds, reptiles and insects, which leads to great loss of native wild life throughout the islands.

Many countries are currently looking at growing high-yielding crops for the production of biofuels as alternatives to traditional fuels (petrol and diesel) to address imminent energy shortages and reduce impacts of climate change. This usually involves the importation of foreign (i.e., alien) species of plants that are known for their fast and productive growth.