1. An adapting, trait-based ecosystem model for phytoplankton succession Jorn Bruggeman 1, Agostino Merico 2, Ursula Gaedke 3, Bas Kooijman 1, Kai Wirtz 2 1 Vrije Universiteit Amsterdam, The Netherlands, 2 GKSS Institute for Coastal Research, Germany, 3 Universität Potsdam, Germany

2. Site: Lake Constance 10 km

3. Site: the ecosystem

4. Site: observations

5. Trait-based model for succession trait abundance trait probability density

6. Linking model and observations bulk variables abundances of individual species field/laboratory bulk variables trait mean and variance trait-based model database parameter values of individual species identify traits and trade-offs reconstruct species abundances

7. speciesmax growth rate (d -1 )PO 4 half sat (µM)length (µm) Dinobryon divergens0.76?? Dinobryon sociale??? Chrysochromulina parva??6 Asterionella formosa1.400.02756 Diatoma elongatum?0.020? Fragilaria crotonensis1.160.02875 Synedra acus2.520.025150 Melosira granulata??24 Stephanodiscus hantzschii1.18?9 Stephanodiscus binderanus??10 Stephanodiscus rotula??26 Ceratium hirundinella0.21?? Peridinium cinctum??27 Chlamydomonas?0.0078 Pandorina morum??? Chlorella minutissima4.23?? Coelastrum??? Scenedesmus??9 Pediastrum??? Monoraphidium??? Sphaerocystis schroeteri?0.025? Dictyosphaerium pulchellum??? Ulothrix subtilissima??? Closterium aciculare??? Staurastrum cingulum0.82?? Mougeotia thylespora2.190.07422 speciesmax growth rate (d -1 )PO 4 half sat (µM)length (µm) Dinobryon divergens0.760.01629 Dinobryon sociale0.730.01629 Chrysochromulina parva0.820.0186 Asterionella formosa1.400.02756 Diatoma elongatum1.290.02062 Fragilaria crotonensis1.160.02875 Synedra acus2.520.025150 Melosira granulata1.250.08224 Stephanodiscus hantzschii1.180.1139 Stephanodiscus binderanus1.250.11310 Stephanodiscus rotula1.250.11326 Ceratium hirundinella0.210.0256 Peridinium cinctum0.390.02527 Chlamydomonas0.990.0078 Pandorina morum0.980.1408 Chlorella minutissima4.230.0214 Coelastrum2.720.0529 Scenedesmus2.880.0539 Pediastrum1.020.0258 Monoraphidium1.020.0258 Sphaerocystis schroeteri1.020.0258 Dictyosphaerium pulchellum0.900.0256 Ulothrix subtilissima0.900.02522 Closterium aciculare0.840.03722 Staurastrum cingulum0.820.03779 Mougeotia thylespora2.190.07422 Phytoplankton database

8. Identifying traits and trade-offs

9. A single population nutrient effective length - - biomass maintenance biomass mortality phytoplankton zooplankton

10. Seasonal cycle: biomass

11. Seasonal cycle: trait distribution Biomass: Mean ± s.d.: Size distribution:

12. Reconstructing individual species

13. Perspectives Multi-annual time series Vertical space > 1 traits