Read more about the article Quantifying the impacts of alien species: developing an IUCN list
The different categories in the scheme to classify the impacts of alien species, and the relationships between them.

Quantifying the impacts of alien species: developing an IUCN list

One of the major transformations of the planet from human activities is the redistribution of species to areas outside their native range. These “alien” species have in many cases caused substantial harmful impacts to the recipient environment.

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Read more about the article Defining the impact of alien species
The sImpact working group in Leipzig, Germany, in July 2013

Defining the impact of alien species

All alien species cause changes to the ecosystems to which they are introduced. Such impacts are of many types - some are dramatic and obvious and can easily be classified as desirable or undesirable. However, for the vast majority of alien species, no information on impact is available. This greatly complicates the task of objectively assigning priority to management.

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Getting the measure of tree invasions

“If you can't measure it, you can't manage it” is, as with all such well-worn phrases, only partly true. But to adapt another such maxim, while we might be able to make progress without measurement, we do need proof to satisfy everyone else.

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Read more about the article Getting a handle on biological invasions around the world — the species, the impacts and the responses
Examples of Critically Endangered birds threatened by IAS include (from left to right): the Juan Fernández Firecrown (Sephanoides fernandensis) threatened by a range of introduced plant and animal IAS on Isla Robinson Crusoe, Juan Fernÿndez Islands, Chile (Credit: Rare Birds Yearbook/Peter Hodum); the Polynesian Ground-dove (Gallicolumba erythroptera) threatened by cats and rats on islands in French Polynesia (Credit: Rare Birds Yearbook/Pete Morris); the Akohekohe (Palmeria dolei), threatened by introduced disease-carrying mosquitoes on Maui, Hawaii (Credit: Rare Birds Yearbook/Aaron French). (Cover design: K. Coombe-Davis).

Getting a handle on biological invasions around the world — the species, the impacts and the responses

Invasive alien species are generally accepted as being one of the top three threats to biodiversity worldwide, but until now there has been no metric for assessing the magnitude problem globally, its impact and our responses to it.

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