Trace element stoichiometry of marine plankton & its effect ... - IMBER

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light Exudation Primary Production POM (particulate organic matter) Dissolved Organic Matter DOM Viral lysis Consumption Excretion Grazers Consumption C-Link Bacteria Euphotic zone mixing Excretion nutrient release Remineralization nutrient / CO 2 release C-Sink Phytoplankton Sinking POM Export nutrients POM export Fecal pellets (egestion), sloppy feeding Deep Ocean sediments
Conclusions • Metal stoichiometry measurements are difficult, methods are evolving • Choice of biomass proxy for normalization is important t • Using functional phytoplankton p groups in models is good approach • Environmental influences must be considered • The transfer of metals across trophic levels appears well constrained • Trace metal stoichiometry may affect production, consumption & remineralization pathways • Understanding of metal stoichiometry can provide insights into ecological dynamics
Page 1 and 2: Twining et al. 2003 Trace element s
Page 3 and 4: Technical challenges determining pl
Page 5 and 6: What to use to normalize the trace
Page 7 and 8: Overview of “bulk plankton” met
Page 9 and 10: But there is significant variabilit
Page 11 and 12: Phytoplankton‐specific metal stoi
Page 13 and 14: Interactions between trace metals a
Page 15 and 16: Metal assimilation efficiency by co
Page 17 and 18: Talk Outline 1. Technical challenge
Page 19 and 20: Trace metal effects on the marine C
Page 21 and 22: Changes in relative trophic positio
Page 23 and 24: Why do pennate diatoms dominate iro
Page 25: Iron storage molecule ferritin disc

Trace element stoichiometry of marine plankton & its effect ... - IMBER

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