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

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Trace metal effects on the marine C cycle: Remineralization and C trophic transfer PROTOZOANS Fe case study - require 2-3 fold more Fe than phytoplankton -their growth efficiency decreases under low Fe (34 vs. 16 %), despite faster filtration rates and ingestion rates of C Phytoplankton iron-deficient ~ 3 (Maldonado & Price 1996) - Fe recycling was higher when Fe limited (60 vs. 85%) (Chase & Price 1997)
Changes in relative trophic position –prey selectivity Fe case study Ochromonas MIXOTROPHS - Ingesting bacteria: an effective way to obtain Fe when Fe is low (additional bacterial C benefits) control - Higher growth efficiency when assimilating bacterial Fe vs. assimilating dissolved Fe - Ingestion rates & clearance rates faster for Fe limited Ochromonas o Fe supplied as dissolved or bacterial Fe control T. pseudonana with bacterial Fe (Maranger et al. 1998)
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: Trace metal effects on the marine C
Page 23 and 24: Why do pennate diatoms dominate iro
Page 25 and 26: Iron storage molecule ferritin disc
Page 27: Conclusions • Metal stoichiometry

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

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