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

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Ecological implications of phytoplankton metal stoichiometry Iron requirements in oceanic pennate vs. centric diatoms a 300 250 200 150 100 Oceanic Pennates, Pseudo-nitzchia spp. Oceanic Centrics, Thalassiosira spp. High Fe Quota High Fe-Q (mol Fe mol C -1 ) b 50 0 14 12 10 8 6 4 • Pennates have higher h maximum Fe quotas than Centrics • Pennates & Centrics have similarly low minimum Fe requirements Fe-Qhigh : Fe-Qlow F Low Fe Quota Low Fe-Q (mol Fe mol C -1 ) c 2 0 60 Oceanic Pennate diatoms (Pseudo- nitzschia spp.) have a higher h Fe storage Low Fe‐Q 40 20 0 capacity than oceanics (Thalassiosira spp.) High Fe‐Q : P. heimii type 1 (UBC403) P. cf. heimii type 2 (UBC303) P. dolorosa (UBC203) P. cf. turgidula (UBC103) T. oceanica (1003) T. parthenela (Thal 9) T. subtilis (50 Ait) P. multiseries (Orø13) P. cf. calliantha (NWFSC186) T. pseudonana (3H) T. weissflogii (Actin) Marchetti et al. L&O 2006
Iron storage molecule ferritin discovered in Pseudo‐nitzschia monomer multimer (24mer) • Exhibits ferroxidase activity • Stores > 600 atoms in vitro multimer (24mer) Marchetti et al. 2009
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: Why do pennate diatoms dominate iro
Page 27: Conclusions • Metal stoichiometry

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

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