Invasive Species Northern Ireland

Gammarus pulex

Gamarus pulex

Status:

Established

Habitat:

Freshwater

Threats:

Outcompetes native species, reducing biodiversity

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Gammarus tigrinus

Status:

Established

Habitat:

Freshwater

Threats:

Predation on native species and bring novel diseases

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New Zealand pigmyweed

Crassula helmsii

Status:

Established

Habitat:

Freshwater

Threats:

Competition with native species.

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Nuttalls waterweed

Elodea nuttallii

Status:

Established

Habitat:

Freshwater

Threats:

Negative impacts on native macrophytes and invertebrates.

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Parrots feather

Myriophyllum aquaticum

Status:

Established

Habitat:

Freshwater

Threats:

Competition with native macrophytes. Clogging of waterways.

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Quagga mussel

Dreissena rostriformis bugensis

Status:

Established

Habitat:

Freshwater

Threats:

Fouling, negative impacts on native species and local extinction of unionids.

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Red-eared, yellow-bellied and Cumberland sliders

Trachemys scripta spp.

Status:

Established

Habitat:

Freshwater

Threats:

It disturbs aquatic habitats and poses a human health risk, being a possible reservoir for salmonella

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Water fern

Azolla filiculoides

Status:

Established

Habitat:

Freshwater

Threats:

Reduction of surface light reaching the benthos.

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Water soldier

Stratiotes aloides

Status:

Established

Habitat:

Freshwater

Threats:

Spreads vegatively. Grows quickly and forms large mats.

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