Bech, Naja

Christensen, Victor Valdemar Eierslev

Hansen, Frederik Bonde

Sandvig, Rasmus Balslev

Schubert-Suell, Kimie Packert

Since 2003 Gracilaria vermiculophylla (ohmi) Papenfuss has spread to become a known invasive species in the Danish seas. It originates from Asia and are suspected imported with the oyster import to the French breeding facilities. G. vermiculophylla have proven resistant towards changes in abiotic stress factors, which might have given it a distinct advantage above the native species. Current estimates suggest that sea surface temperatures in seas surrounding Denmark will increase by 0,3-0,4°C each decade until year 2099 and salinities will decrease by 0,5-2,5 psu depending on location by year 2075. Thus, a collection of relevant data from scientific articles regarding G. vermiculophylla were collected with focus on growth rates under changed abiotic conditions. The difference in growth rate when exposed to different abiotic factors like temperature, salinity and irra-diance are investigated and compared with prognoses of the same abiotic changes in the Danish seas. This provides an insight to the future distribution and growth of G. vermicu-lophylla in the Danish seas. The growth rate of G. vermiculophylla is positively affected by temperatures within ~5-38 °C, by salinities within ~5-30 psu and by irradiances within (0&lt;)-225 µmol m-2 s-1. Future change of temperature and salinity in the habitats of G. vermiculophylla in Danish marine coastal areas will be within the thresholds for the growth of the red macroalgae.Since 2003 Gracilaria vermiculophylla (ohmi) Papenfuss has spread to become a known invasive species in the Danish seas. It originates from Asia and are suspected imported with the oyster import to the French breeding facilities. G. vermiculophylla have proven resistant towards changes in abiotic stress factors, which might have given it a distinct advantage above the native species. Current estimates suggest that sea surface temperatures in seas surrounding Denmark will increase by 0,3-0,4°C each decade until year 2099 and salinities will decrease by 0,5-2,5 psu depending on location by year 2075. Thus, a collection of relevant data from scientific articles regarding G. vermiculophylla were collected with focus on growth rates under changed abiotic conditions. The difference in growth rate when exposed to different abiotic factors like temperature, salinity and irra-diance are investigated and compared with prognoses of the same abiotic changes in the Danish seas. This provides an insight to the future distribution and growth of G. vermicu-lophylla in the Danish seas. The growth rate of G. vermiculophylla is positively affected by temperatures within ~5-38 °C, by salinities within ~5-30 psu and by irradiances within (0&lt;)-225 µmol m-2 s-1. Future change of temperature and salinity in the habitats of G. vermiculophylla in Danish marine coastal areas will be within the thresholds for the growth of the red macroalgae

Gracilaria vermiculophylla's tolerance to future climate changes in Danish marine coastal areas

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Roskilde Universitet