Alien species on sylt
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Alien species on Sylt. Seaweeds. Maria Redeker, Carolin Barz, Olga Kolychalow. Native Phaeophycea (brown alga). http://www.arkive.org/species/ARK/plants_and_algae/Fucus_vesiculosus/. 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

Alien species on Sylt

Seaweeds

Maria Redeker, Carolin Barz, Olga Kolychalow


Native phaeophycea brown alga

Native Phaeophycea (brown alga)

http://www.arkive.org/species/ARK/plants_and_algae/Fucus_vesiculosus/

Fucus vesiculosus


Alien algae on sylt

Gracilaria vermiculophylla

Since 2002 in Wadden Sea

Sargassum muticum

Since 1993 on Sylt

Alien Algae on Sylt

http://www.algaebase.org/search/species/detail/?species_id=4417

http://www.issg.org/database/species/ecology.asp?si=727&fr=1&sts=sss


Alien species on sylt

Aims

  • 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

Study sites

  • Oyster bed

  • Former military area

  • Boulders

  • Oyster farm

http://www.welt-atlas.de/datenbank/karten/karte-1-227.gif


Methods

Methods

  • Measuring length of thalli

  • Determine attachment type


Length of macroalgae

Length of macroalgae


Length of f vesiculosus relating to attachment type

Length of F. vesiculosus relating to attachment type


Length of g vermiculophylla relating to attachment type

Length of G. vermiculophylla relating to attachment type


Length of s muticum relating to attachment type

Length of S. muticum relating to attachment type


Results

Results

  • 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


Discussion

Discussion

  • 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)


Discussion1

Discussion

  • 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


Conclusions

Conclusions

  • 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


Conclusions1

Conclusions

  • 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

Thank you for your attention!!


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