Darwin's Barnacle

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Isle of Man Non Native Marine Invasive Species Alert Darwin’s Barnacle Scientific Name: Austrominius modestus Habitat: Found at all levels of the shore but is more common mid-shore and may extend to shallow sublittoral. Native to: Australasia Key ID Features: It attaches to a wide variety of substrata including rocks, stones, shells, other crustaceans and artificial structures including ships. It is more tolerant of turbidity and reduced salinity than Semibalanus balanoides and Chthamalus species and is found in estuaries as well as on open coasts where the wave exposure is not high. Elminius modestus is a small barnacle, 5-10 mm in diameter, characterised by having only 4 calcified shell plates. The body shape is low and conical with a large diamond shaped opercular aperture. In young barnacles the shell plates are smooth and the bottom margin of each has an indentation in the centre. The shell plates of older individuals have marked vertical ridges that give the barnacle an irregular, roughly circular margin. The young are opalescent greyish white in colour while the adults become drab greyish brown and eroded. Elminius modestus not only competes with endemic British species, particularly Balanus balanoides, but has colonized some sheltered and estuarine habitats not previously inhabited by them. If you see this species please record the following details: Location of species Date and time of sighting Depth of species Photographs taken ? and report to Tony Glen ([email protected]) or Philippa Tomlinson ([email protected]). .

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Cumulative Effects of Multiple Stressors: an Invasive Oyster and Nutrient Enrichment Reduce Subsequent Invasive Barnacle Recruitment
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