Competition between Fucus vesiculosus and Ceramium virgatum

Roxana Faur & Tilde Olivia Lerke Bruun

Studenteropgave: Fagmodulprojekt


Eutrophication has had an impact on the coastal system all over the world, which derived from the increased input of nutrients. Higher temperature as an effect of climate change together with higher nutrients levels have caused better growth condition for fast-growing algae on the expense of slow-growing benthic algae. In this experiment we have investigated the behavior and relationship between two different growing strategy species of macroalgae and nutrients.

To study the effect of nutrients between the two different macroalgae an experiment in the laboratory was conducted. Fucus vesiculosus was chosen as a slow-growing algae and Ceramium virgatum as a fast-growing algae. They were cultivated together and alone, two different levels of ammonium concentration was added 0 and 50 μM and the difference in growth was measured.

It was found that C. virgatum had a better growth than F. vesiculosus both with and without ammonium addition, which indicates that C. virgatum was better at acclimating to the experimental conditions. In addition was found that shading from C. virgatum had a positive effect on the growth of F. vesiculosus, due to the attenuation of light and less heat contact.

If the problems relating to eutrophication and climate change remain, these results could indicate, that C. virgatum with a higher stress tolerance than F. vesiculosus in the future may have a better chance to adapt to an environment condition with higher input of nutrients and temperature.

UddannelserMiljøbiologi, (Bachelor/kandidatuddannelse) Bachelor
Udgivelsesdato26 maj 2016
Antal sider32


  • Fucus vesiculosus
  • Ceramium virgatum
  • Næringsoptag
  • Ammonium
  • Konkurrence