While the hybrid species are very aggressive, S alterniflora is a fairly poor invader of the south coast of England. Biodiversity reduction and extinction rates Maintaining biodiversity is the motivating factor behind most conservation issues. The importance preserving biodiversity may not be immediately apparent. A diverse ecosystem can provide many utilitarian and intrinsic services. Our ecosystems provide us with goods, services, and information.
Goods includes fod, fuel, fiber, medicine, and even organic pesticides.
Services are everything from pollination, recycling of organic wastes, fixation of atmospheric nitrogen, and regulation of the atmosphere. Beyond utilitarian goods, services, and information, a diverse world provides humans with aesthetic beauty to enjoy. Conserving biodiversity is advantageous for both the human and non-human world. Local diversity may increase as non-native species establish in new ecosystems, but world biodiversity will decrease as rare species are displaced by invaders. In Hawaii, where the pre-human rate of introduction was one species per 100,000 years, when Polynesians arrived the rate jumped to 1 species per 50 years, and after European colonization the rate exceeded one species per 0.25 years.