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An adapting, trait-based ecosystem model for phytoplankton succession
Jorn Bruggeman1, Agostino Merico2, Ursula Gaedke3, Bas Kooijman1, Kai Wirtz2
1 Vrije Universiteit Amsterdam, The Netherlands, 2 GKSS Institute for Coastal Research, Germany, 3 Universität Potsdam, Germany
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Site: Lake Constance
10 km
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Site: the ecosystem
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Site: observations
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Trait-based model for succession
trait
abun
danc
e
trait
prob
abili
ty d
ensi
ty
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Linking model and observations
bulk variablesabundances of
individual species
field/laboratory
bulk variablestrait mean and
variance
trait-based modeldatabase
parameter values of individual species
identify traits and trade-offs
reconstruct species abundances
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species max growth rate (d-1) PO4 half sat (µM) length (µm)Dinobryon divergens 0.76 ? ?Dinobryon sociale ? ? ?Chrysochromulina parva ? ? 6Asterionella formosa 1.40 0.027 56Diatoma elongatum ? 0.020 ?Fragilaria crotonensis 1.16 0.028 75Synedra acus 2.52 0.025 150Melosira granulata ? ? 24Stephanodiscus hantzschii 1.18 ? 9Stephanodiscus binderanus ? ? 10Stephanodiscus rotula ? ? 26Ceratium hirundinella 0.21 ? ?Peridinium cinctum ? ? 27Chlamydomonas ? 0.007 8Pandorina morum ? ? ?Chlorella minutissima 4.23 ? ?Coelastrum ? ? ?Scenedesmus ? ? 9Pediastrum ? ? ?Monoraphidium ? ? ?Sphaerocystis schroeteri ? 0.025 ?Dictyosphaerium pulchellum ? ? ?Ulothrix subtilissima ? ? ?Closterium aciculare ? ? ?Staurastrum cingulum 0.82 ? ?Mougeotia thylespora 2.19 0.074 22
species max growth rate (d-1) PO4 half sat (µM) length (µm)Dinobryon divergens 0.76 0.016 29Dinobryon sociale 0.73 0.016 29Chrysochromulina parva 0.82 0.018 6Asterionella formosa 1.40 0.027 56Diatoma elongatum 1.29 0.020 62Fragilaria crotonensis 1.16 0.028 75Synedra acus 2.52 0.025 150Melosira granulata 1.25 0.082 24Stephanodiscus hantzschii 1.18 0.113 9Stephanodiscus binderanus 1.25 0.113 10Stephanodiscus rotula 1.25 0.113 26Ceratium hirundinella 0.21 0.025 6Peridinium cinctum 0.39 0.025 27Chlamydomonas 0.99 0.007 8Pandorina morum 0.98 0.140 8Chlorella minutissima 4.23 0.021 4Coelastrum 2.72 0.052 9Scenedesmus 2.88 0.053 9Pediastrum 1.02 0.025 8Monoraphidium 1.02 0.025 8Sphaerocystis schroeteri 1.02 0.025 8Dictyosphaerium pulchellum 0.90 0.025 6Ulothrix subtilissima 0.90 0.025 22Closterium aciculare 0.84 0.037 22Staurastrum cingulum 0.82 0.037 79Mougeotia thylespora 2.19 0.074 22
Phytoplankton database
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Identifying traits and trade-offs
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A single population
nutrient
effective length
--
biomass
maintenance
biomass
mortality
phytoplankton
zooplankton
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Seasonal cycle: biomass
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Seasonal cycle: trait distribution
Biomass:
Mean ± s.d.:
Size distribution:
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Reconstructing individual species
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Perspectives
• Multi-annual time series• Vertical space• > 1 traits