Invasive alien species (IAS) is one of the most serious threats to natural ecosystems all over the world. Together with increasing natural and semi-natural habitat fragmentation, degradation and loss, natural/biological resource exploitation, environmental contamination and pollution and climate change, they are considered as the main negative factors threatening as a driver biological diversity. IAS introduction and spread can also result in significant negative economic impacts, in addition to often posing serious threats to human health. The increasing human mobility has been significantly helping to introduce and to spread the above species. They could be disseminated intentionally, e. g. as ornamental species (the Giant hogweed Heracleum mantegazzianum, the Himalayan balsam Impatiens glandulifera and knotweeds Fallopia spp. in the 19th century) or untintentionally together with other species, particularly by transport and trade. The third possibility is a spontaneous spread of invasive species, e.g. the Mediterranean wasp spider (Argiope bruennichi).
This webpage provides up-to-date information on IAS in the Czech Republic, including current legislation, description of the most important invasive alien plants and animals as well as information on IAS prevention, elimination and eradication projects and on the most effective IAS control and regulation methods and techniques. It also links to key publications on IAS as well as to institutions dealing with the issue. Through an early warning system presented on this webpage, everyone could be involved in IAS mapping in the Czech Republic and thus, contribute to protecting nature and the landscape from IAS introduction and spread