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What is an invasive species?

What is an invasive species? | Invasive Species topics | Scoop.it

An invasive species, also known as an exotic or nuisance species, is an organism or plant that is introduced into a new environment, where it is not native


Via Kathy Bosiak
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Great Lakes Invasive Species

Great Lakes Invasive Species | Invasive Species topics | Scoop.it

An "invasive species" is a plant or animal that is non-native (or alien) to an ecosystem, and whose introduction is likely to cause economic, human health, or environmental damage in that ecosystem. Once established, it is extremely difficult to control their spread.    

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UNITED KINGDOM: Crayfish spread reports probed

UNITED KINGDOM: Crayfish spread reports probed | Invasive Species topics | Scoop.it
Investigation work is planned after reports of a potentially devastating invasive species being discovered in the River Nith.

 

Scottish Natural Heritage is to carry out surveys to see if North American signal crayfish are established in the south of Scotland river.

 

The crayfish were first found in Scottish waters in 1995.

 

Escapes from fish farms or illegal releases are thought to be the reason for their spread through the UK.

 

The waters of Loch Ken in Dumfries and Galloway are already infested with the species.

 

Reports have now been received of a discovery on the River Nith in the region.

 

They can have a hugely damaging impact on angling waters and are difficult to eradicate once established.

 

Dr Colin Bean, a freshwater adviser with SNH, said the latest incident would be examined closely.

"The prospects of removing signal crayfish from any water body - particularly one the size of the Nith - is likely to be difficult if not impossible," he said.

 

"So it is important for us to know what is actually there before any moves are made to try and develop any containment."

 

Anglers finding the fish have been advised to let either the Scottish Environment Protection Agency (Sepa) or SNH know.

 

The crayfish should not be moved as it is illegal to do so.

 

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Lionfish: Invasive species devastating reefs, expert says

Lionfish: Invasive species devastating reefs, expert says | Invasive Species topics | Scoop.it
Expert says fish were initially brought to the U.S. as aquarium fish, but releasing them into the wild is having serious consequences for tropical reefs
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Meet 11 Species That Are Set To Take Over The Earth

Meet 11 Species That Are Set To Take Over The Earth | Invasive Species topics | Scoop.it
Invasive species are bad news. They compete with native critters for food, destroy local ecology and, in some cases, are even dangerous to humans.

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Loch Ken biodiversity 'destroyed' by invasive crayfish - BBC News

Loch Ken biodiversity 'destroyed' by invasive crayfish - BBC News | Invasive Species topics | Scoop.it
BBC News
Loch Ken biodiversity 'destroyed' by invasive crayfish
BBC News
A Scots loch has seen its biodiversity virtually wiped out by an "invasive alien species", according to an MSP.

Via Maria Nunzia @Varvera
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Invasive alien species: a growing problem for environment and health - EEA (2013)

Invasive alien species: a growing problem for environment and health - EEA (2013) | Invasive Species topics | Scoop.it

Invasive alien species pose greater risks than previously thought for biodiversity, human health and economies, according to two new reports from the European Environment Agency (EEA). 

An alien or non-native species is an organism which humans have introduced –intentionally or accidentally -outside its previous range. It is deemed ‘invasive’ if it has negative effects on its surroundings, for example by outcompeting or predating on native species that have evolved without specific adaptations to cope with them. In such cases populations of native species can be devastated. Evidence shows that in a growing number of cases invasive alien species even cause harm to human health and society. 

There are more than 10 000 alien species present in Europe, and the rate of new introductions has accelerated and is still increasing. At least 15 % of these alien species are known to have a negative ecological or economic impact. However, non-native species – for example, some food crops – can also have huge benefits...


Via Alexander J. Stein
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