Intraspecific variation in metal tolerance modulate competition between two marine diatoms

Andersson, Björn,1985Gothenburg University,Göteborgs universitet,University of Gothenburg,Institutionen för marina vetenskaper,Department of marine sciences (author)

Despite widespread metal pollution of coastal ecosystems, little is known of its effect on marine phytoplankton. We designed a co-cultivation experiment to test if toxic dose–response relationships can be used to predict the competitive outcome of two species under metal stress. Specifically, we took into account intraspecific strain variation and selection. We used 72 h dose–response relationships to model how silver (Ag), cadmium (Cd), and copper (Cu) affect both intraspecific strain selection and competition between taxa in two marine diatoms (Skeletonema marinoi and Thalassiosira baltica). The models were validated against 10-day co-culture experiments, using four strains per species. In the control treatment, we could predict the outcome using strain-specific growth rates, suggesting low levels of competitive interactions between the species. Our models correctly predicted which species would gain a competitive advantage under toxic stress. However, the absolute inhibition levels were confounded by the development of chronic toxic stress, resulting in a higher long-term inhibition by Cd and Cu. We failed to detect species differences in average Cu tolerance, but the model accounting for strain selection accurately predicted a competitive advantage for T. baltica. Our findings demonstrate the importance of incorporating multiple strains when determining traits and when performing microbial competition experiments.

Godhe, AnnaGothenburg University,Göteborgs universitet,University of Gothenburg,Institutionen för marina vetenskaper,Department of marine sciences(Swepub:gu)xgodan (author)
Filipsson, Helena L.Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science(Swepub:lu)geol-h_f (author)
Zetterholm, LindaGothenburg University,Göteborgs universitet,University of Gothenburg,Institutionen för marina vetenskaper,Department of marine sciences (author)
Edler, Lars (author)
Berglund, OlofLund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Akvatisk ekologi,Forskargrupper vid Lunds universitet,Division aquatic ecology,Department of Biology,Faculty of Science,Aquatic Ecology,Lund University Research Groups(Swepub:lu)lim-obe (author)
Rengefors, KarinLund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Akvatisk ekologi,Forskargrupper vid Lunds universitet,Division aquatic ecology,Department of Biology,Faculty of Science,Aquatic Ecology,Lund University Research Groups(Swepub:lu)lim-kre (author)
University of GothenburgInstitutionen för marina vetenskaper (creator_code:org_t)

In:ISME Journal: Springer Science and Business Media LLC16, s. 511-5201751-73621751-7370

By the author/editor: Andersson, Björn ...; Godhe, Anna; Filipsson, Helen ...; Zetterholm, Lind ...; Edler, Lars; Berglund, Olof; show more...; Rengefors, Karin; show less...

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