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Antithamnionella ternifolia

Invasive Species Information

Creeping Bellflower  - Campanula rapunculoides Biodiversity Medium Risk Invasive Species 14

What Is Antithamnionella ternifolia?

Habitat: Aquatic, marine
Distribution in Ireland: West Ireland coastal areas

Status: Established

Family name: Ceramiaceae

Common name/sAntithamnionella sarniensis Lyle, red seaweed.

Reproduction: The species has a rapid growth rate and grows abundantly on all types of substrata including eelgrass leaves, algae, animals, pebbles and artificial materials, over a wide range of conditions.

This species shows a wide temperature tolerance. Sexual reproduction is rare with the main method of reproduction being fragmentation.

Clover broomrape Biodiversity Medium Risk Invasive Species 14

Antithamnionella ternifolia

Clover broomrape Biodiversity Medium Risk Invasive Species 14

Thallus of uncorticated, monosiphonous, prostrate axes bearing erect branches.

 

Cells with 1-4 determinate branchlets, inconsistent in number per cell and in branching pattern of branchlet.

Gland cells lateral and sessile on 2nd-5th cell of branchlet axis or on branches of the branchlet.

Recent studies on ecology, morphology and reproduction have established Antithamnionella sarniensis and Antithamnionella spirographidis as distinct species.

 

Genetic isolation also demonstrated by complete failure of interspecific crossing. 

Antithamnionella ternifolia

Procarps, 1-3, borne near branch apices on basal cells of successive branchlets usually reduced to one cell beyond the basal (supporting) cell.

 

Antithamniella has sometimes been included in the genus Antithamnion, but differs in features of branching, position of gland cells, fewer procarps borne on reduced branchlets and tetrahedral division of tetrasporangia.

It has spread fairly rapidly around the coasts in western Ireland . It spreads mainly through remote dispersal as it grows on ropes and ships' hulls.

How To Identify Antithamnionella ternifolia?

Clover broomrape Biodiversity Medium Risk Invasive Species 14

Thallus
Frond:

Holdfast

Clover broomrape Biodiversity Medium Risk Invasive Species 14
Clover broomrape Biodiversity Medium Risk Invasive Species 14

Antithamnionella ternifolia  ID Guide

Antithamnionella ternifolia

Antithamnionella ternifolia

Why Is Antithamnionella ternifolia A Problem?

Antithamnionella ternifolia is an alien (non-native) invasive plant, meaning it out-competes crowds-out and displaces beneficial native plants that have been naturally growing in Irish coastal waters for centuries.

 

  • Displacement of native species

  • Introduction of new pests and parasites which affect native species

  • Habitat alteration

  • Changes in food webs, particularly through dietary competition and predation

  • Degradation of integrity of gene pool through hybridisation

  • Associated effect of commercial harvesting Improved water quality

  • Fouling of ships, marinas, moorings, nets, shellfish & aquaculture structures

  • Competition with and predation on aquaculture sp. Food source to humans and wildlife

  • Damage to nets

  • Increased productivity of previously uncolonised habitats 

European Communities (Birds and Natural Habitats) Regulations 2011 non-native invasive plant species A-Z (Updated 2017)

There are currently 35 invasive plant species listed in the European Communities (Birds and Natural Habitats) Regulations (annex 2, Part 1)...

 

Click on a species from the following list to find out more regarding non-native species subject to restrictions under Regulations 49 and 50.

Additional Non-Native Plant Species identified as Medium Risk on Ireland's Biodiversity List...

Common name 

African woodsorrel

American skunk cabbage

Annual bur-sage

Antithamnionella ternifolia

Barberry

Black currant

Brazilian waterweed

Butterfly-bush

Canadian-fleabane

Clover broomrape

Creeping Bellflower

Dead man's fingers

Douglas fir

Early goldenrod

False acacia

Field penny-cress

Garden lupin

Giant rhubarb

Hairy rocket

Himalayan honeysuckle

Himalayan knotweed

Holm oak

Japanese barberry

Japanese honeysuckle

Japanese rose

Leafy spurge

Least duckweed

Narrow-leaved ragwort

New Zealand bur

Ostrich fern

Pampas grass

Pitcherplant

Red oak

Red sheath tunicate

Rock cotoneaster

Rum cherry

Russian-vine

Salmonberry

Sea-buckthorn

Sycamore

Three-cornered garlic

Traveler's-joy

Tree of heaven

Turkey oak

Virginia-creeper

Warty cabbage

Water fern

Wild parsnip

Environment 

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Freshwater 

Terrestrial 

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Terrestrial  

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Marine 

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Risk score 

14

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17

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14

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14

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14

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14

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14

14

14

14

14

14

14

17

14

14

14

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15

17

17

14

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15

14

15