Friday, January 29, 2010

Invasive alien species

Invasive alien species are species whose introduction and/or spread outside their natural habitats threatens biological diversity. They occur in all groups, including animals, plants, fungi, bacteria and viruses, and can affect all types of ecosystems. They can directly affect human health. Infectious diseases are often traced to IAS imported by travellers or vectored by exotic species of birds, rodents and insects. IAS also have indirect health effects on humans as a result of the use of pesticides and herbicides, which pollute water and soil. They may look harmless but are dangerous, mainly causing flu, allergies, respiratory disorders and even infertility among humans and animals. Sometimes they manifest themselves as bird flu and at other times as foot-and-mouth disease and mad cow disease and lead to massive destruction of livestock populations. The biggest casualty of such species has been our rich biodiversity, and threats to food security.

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