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Species are regarded invasive aliens if they have been introduced into the region either intentionally or accidentally or arrived in the new territory through expansion. Scientists selected 52 most widespread and dangerous alien species from the long list including, e.g., Sosnowsky’s hogweed, Canadian pondweed, Colorado potato beetle, onion and potato parasitic nematodes, etc.

The entry for each species includes a general description, biological and ecological characteristics, distribution history and patterns. Special focus is on the species’ aggressiveness and harmfulness, either observed or potential, for natural ecosystems, human health, and the region’s economy. The methods to control and combat the dangerous aliens are described.

Invasive species are a globally recognized problem and many countries are developing relevant policies. Russia also needs to intensify control of such species. The key challenges for this mission are inadequate legislation, general shortage of information, and low public awareness.

Preparation and publication of the book “Invasive Plants and Animals in Karelia” was made possible by the research carried out within the 3-year international project DIAS under the Karelia Cross-border Cooperation Programme 2014–2020.

The number of hard copies is limited but the electronic version will be in open access on KarRC RAS website. The authors hope that the edition will be of interest not only for specialists in the field but also for university professors and students, schoolchildren, and for any person caring for the nature of their native land.