Alien species on sylt
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Alien species on Sylt. Seaweeds. Maria Redeker, Carolin Barz, Olga Kolychalow. Native Phaeophycea (brown alga). Fucus vesiculosus. Gracilaria vermiculophylla Since 2002 in Wadden Sea. Sargassum muticum

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Alien species on Sylt

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Alien species on Sylt


Maria Redeker, Carolin Barz, Olga Kolychalow

Native Phaeophycea (brown alga)

Fucus vesiculosus

Gracilaria vermiculophylla

Since 2002 in Wadden Sea

Sargassum muticum

Since 1993 on Sylt

Alien Algae on Sylt


  • Do the species differ in length?

  • Does any species prefer any specific attachment type?

  • Does the length of the alga depend on the attachment type?

  • Is there any competition between native and non-native species?

  • Does the length reflect any habitat provision?

  • May the non-native species have any effect on biodiversity?

Study sites

  • Oyster bed

  • Former military area

  • Boulders

  • Oyster farm


  • Measuring length of thalli

  • Determine attachment type

Length of macroalgae

Length of F. vesiculosus relating to attachment type

Length of G. vermiculophylla relating to attachment type

Length of S. muticum relating to attachment type


  • No obvious dependence of length and attachment type

  • Attachment type does not influence growth

  • Not possible to state if species prefer any specific attachment type


  • Notably longer thalli and complexity of structure of both invasive species may imply a larger surface, i.e. habitat

  • S. muticum supports twice as many species (local) as F.vesiculosus

  • S. muticum provides habitat for species which otherwise would be rare or absent (e.g. several species of red algae)


  • No competition between S. muticum and F. vesiculosus as they occur at different water levels

  • G. vermiculophylla and F. vesiculosus occur in the same spots


  • Up to now no replacement of native species recorded in SE Wadden Sea

  • Seem to have positive effects on habitat formation and biodiversity

  • As non-native algae species are expected to increase in abundance, this might affect competitive ability of native species


  • Species have the potential to alter the ecology of Wadden Sea

  • Attempts to eradicate S. muticum likely to fail

  • Due to insufficient knowledge it is not possible to predict the future effects

  • More research is needed !!!!!!

Thank you for your attention!!

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