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Ensis americanus and Mya arenaria in the Wadden Sea

Ensis americanus and Mya arenaria in the Wadden Sea. Coastal and Marine Ecosystem Field Studies, SS 2008. Fabian Delong, Sam Jantz, Rashed Sheriff, Jan Wildefeld. E. americanus. Introduced to Europe in the late 1970’s Rapidly spread along the continental coastline of the North Sea.

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Ensis americanus and Mya arenaria in the Wadden Sea

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  1. Ensis americanus and Mya arenaria in the Wadden Sea Coastal and Marine Ecosystem Field Studies, SS 2008 Fabian Delong, Sam Jantz, Rashed Sheriff, Jan Wildefeld

  2. E. americanus • Introduced to Europe in the late 1970’s • Rapidly spread along the continental coastline of the North Sea

  3. Occupies the sediment in the sub-tidal and intertidal zones • Areas of colonization are scarcely populated with native fauna

  4. M. arenaria • Present in Europe in late Pliocene • Possibly re-introduced to Europe in the 13th Century by Vikings

  5. Wide range of habitat and food preferences • Highest densities found in intertidal and shallow sub-tidal zones

  6. Methods • Sampled individuals of E. americanus along a 50 meter transect on the lower portion of the intertidal zone • 50 individuals, 35 dead and 15 living • Measured length and counted growth ridges

  7. Results

  8. Results

  9. Results

  10. Impacts E.americanus • No significant interactions with native species • Possibly hazardous for bathers. Occurs in fairly shallow depths • Can cause damage to trawls and other commercial fishing equipment

  11. Impacts M.arenaria • No information is available on impact since invasion of North Sea • No negative impacts on other species is observed today • Has been observed to competitively exclude native species in other regions

  12. Management M.arenaria • Has been thoroughly established for several centuries and seems to be benign. No action is needed E.americanus • Seemingly benign, however population sizes as well as interactions with native species should be monitored

  13. Additional Idea: How to reach the public www.aliens-europe.org

  14. Additional Idea: How to reach the public www.aliens-sylt.org ?!

  15. Additional Idea: How to reach the public www.aliens-sylt.org ?!

  16. Thank you for your attention

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