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Role of Infochemical-Mediated Feeding in Planktons

Role of Info chemical-Mediated Feeding in Multitrophic Plankton Interactions

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Role of Infochemical-Mediated Feeding in Planktons

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  1. S H3C CH3 Role of Infochemical-Mediated Feeding in Multitrophic Plankton Interactions Nicola Lewis ndlewi@essex.ac.uk Supervisors: Edd Codling and Michael Steinke G. Gorick

  2. How do zooplankton find prey? rp rc Breckels et al. (2011) J Plankton Res 33: 629-639

  3. H3C H3C H2C COO- DMSP lyase COO- S+ H+ C S CH3 H3C H Acrylate DMSP DMS + Steinke et al. (2002) J Phycol 38: 630-638

  4. Tritrophic Model – Methods Phytoplankton growth g K Microzooplankton grazing r Microzooplankton mortality (absence of DMS) Microzooplankton mortality (presence of DMS) k Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  5. Tritrophic Model – Methods Copepod predation rate Density/ abundance of copepods Production rate of DMS Rate DMS leaves the system Increase in copepod predation (through chemodetection) Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  6. Tritrophic Model – Results 1. No DMS effect Phase Portrait Temporal Graph × × Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  7. Tritrophic Model – Results 1. No DMS effect Phase Portrait Temporal Graph × × Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  8. Tritrophic Model – Results 1. No DMS effect Phase Portrait Temporal Graph × × Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  9. Tritrophic Model – Results 1. No DMS effect Phase Portrait Temporal Graph × × Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  10. Tritrophic Model – Results 1. No DMS effect Phase Portrait Temporal Graph × × Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  11. × × Tritrophic Model – Results 2. Low DMS effect Phase Portrait Temporal Graph Microzooplankton Phytoplankton / Microzooplankton Phytoplankton Time Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  12. Tritrophic Model – Results 3. Mid DMS effect Phase Portrait Temporal graphs Phytoplankton / Microzooplankton Microzooplankton Phytoplankton Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  13. × × Tritrophic Model – Results 4. High DMS effect Phase Portrait Temporal Graph Microzooplankton Phytoplankton / Microzooplankton Phytoplankton Time Lewis et al. (2011) Biogeochem, DOI: 10.1007/s10533-011-9649-0.

  14. Competition?

  15. Competition? DMSP as a deterrent!

  16. Competition? DMSP as an attractor!

  17. Competition? No DMS production!

  18. Conclusions • Infochemicals such as DMS are important for zooplankton in the search for suitable prey. • Grazing-induced DMS may affect the susceptibility of microzooplankton to predation by copepods. • Infochemical mediated feeding in the plankton may create a refuge from grazing for phytoplankton through the promotion of multitrophic interactions

  19. Acknowledgments UoE Edd Codling Michael Steinke Mark Breckels Others Andrew Morozov Jon Pitchford Steve Archer

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