Invasive Species Northern Ireland

Butterfly bush

Buddleja davidii

Status:

Established

Habitat:

Terrestrial

Threats:

Forms monocultures. Reproduces sexually and asexually. Displaces native species.

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Canada goose

Branta canadensis

Status:

Established

Habitat:

Freshwater

Threats:

Can alter nutrient levels from their droppings, spread disease and damage farmland by grazing

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Canadian waterweed

Elodea canadensis

Status:

Established

Habitat:

Freshwater

Threats:

Creates single species stands. Outcompetes native plants. Reduces waterflow.

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Carpet sea squirt

Didemnum vexillum

Status:

Established

Habitat:

Marine

Threats:

Alter marine habitats.

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Chub

Squalius cephalus

Status:

Established

Habitat:

Freshwater

Threats:

Negative impacts on native salmonid species. Associated economic impacts.

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Clematis vitalba

Status:

Established

Habitat:

Terrestrial

Threats:

Outcompetes native species. Lowers plant biodiversity.

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Cotoneaster

Cotoneaster spp.

Status:

Established

Habitat:

Terrestrial

Threats:

Outcompetes native species. Easily spread.

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Crangonyx

Crangonyx pseudogracilis

Status:

Established

Habitat:

Freshwater

Threats:

Can displace native species

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Curly waterweed

Lagarosiphon major

Status:

Established

Habitat:

Freshwater

Threats:

Significant changes to the ecology of the invaded habitat for native plants, insects and fish.

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