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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

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

slide4
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
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 !!!!!!
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