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Invasive species in Hawaii
As with a number of other geographically isolated islands, Hawaii has problems with invasive species affecting the natural biodiversity of the islands.
==Historical examples==
Most of the species within Hawaii cannot truly be classified as native species since Hawaii is a group of islands; therefore, all, or most, of the species had to migrate there or be brought over to the islands by humans. However, there are a majority of species which were introduced for specific reasons yet they have disrupted Hawaiian biodiversity. The mongoose was introduced to Hawaii in the mid-19th century in an attempt to control the large rat population in the sugar cane fields. However, since then, the mongoose population has grown to large numbers without controlling the nocturnal rat population and has greatly diminished the population of ground nesting birds.
Another example of an invasive species introduced in the 19th century is the fire tree, which is a small shrub that was brought from the Azores, Madeira, and the Canary Islands as an ornamental plant or for firewood. However, now it poses a serious threat to native plants on young volcanic sites, lowland forests, and shrublands, where it forms dense monocultural stands〔http://www.defenders.org/resources/publications/invasives/hawaii.pdf〕
Another plant, the strawberry guava, was introduced in the early 19th century as an edible fruit. However, it now poses a major threat to Hawaii's rare endemic flora and fauna by forming shade-casting thickets with dense mats of surface feeder roots.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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