Nikolaos Alexandridis. Photo.

Nikos Alexandridis

Postdoctoral fellow

Nikolaos Alexandridis. Photo.

Modeling the effects of abiotic and biotic factors on the depth distribution of Fucus vesiculosus in the Baltic Sea

Author

  • Nikolaos Alexandridis
  • Andreas Oschlies
  • Martin Wahl

Summary, in English

The conspicuous retreat of the key species Fucus vesiculosus from the deeper parts of its former distribution area in the Baltic Sea has triggered extensive research on the factors that control its growth. Based on recently obtained knowledge on a large number of potential drivers, we developed a numerical model incorporating effects of abiotic factors on the physiological functions of photosynthesis, respiration, and reproduction and the ecological processes of competition, grazing, and epibiosis. For all input combinations, the model delivers the monthly net growth rate near the bladder wrack's depth limit and the maximum depth of its vertical distribution. The use of data corresponding to conditions presently observed in the western Baltic Sea sets the year's maximum algal net growth rate in late spring and 2 minima in early spring and autumn. The depth limit of the wrack's distribution is set at ~9 m. Light and its absorption by phytoplankton represent by far the most important factors controlling the modeled net growth rate and depth penetration, with the role of epibiosis requiring further investigation. Lacking findings on population dynamics and biotic interactions restrict the generated model to an exploratory rather than a predictive tool.

Publishing year

2012-08-30

Language

English

Pages

59-72

Publication/Series

Marine Ecology Progress Series

Volume

463

Document type

Journal article

Publisher

Inter-Research

Topic

  • Ecology

Keywords

  • Benthic ecology
  • Biotic interactions
  • Bladder wrack
  • Depth limit
  • Ecological modeling
  • Eutrophication
  • Fucus physiology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0171-8630