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

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Size‐fractionation of metal stoichiometry in the field • Metal content (Al, Ti, Mn, Fe, Co, Ni, Cu, Zn) decreases as size of organisms increases (Ho et al. 2007) a) Higher SA to volume ratio in the smaller fractions, potential for more extracellular trace metals Ho et al 2007 Me g wt -1 ) (μg M 10 -60 m 60 -150 m > 150 m
But there is significant variability within the mean values…. Two ends of each box represents the 25 & 75 percentiles for all data Under identical growth conditions, difference among species (~20 fold, exception Cd) ) reflects: 1. Unique cell biochemistry 2. Ability to take up Me + 3. Ability to store Me + Ho et al. 2003
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: Overview of “bulk plankton” met
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 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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