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Shallow Subtidal Sandy Community: Zuma Beach Jon Kastendiek, Ph.D.

Shallow Subtidal Sandy Community: Zuma Beach Jon Kastendiek, Ph.D. Dendraster Community – Zuma Beach. Dendaster – Suspension feeder - aboral. Dendaster – Suspension feeder - aboral. Astropecten – Predator of Renilla. Renilla kollokeri – suspension feeder. Armina – Predator of Renilla.

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Shallow Subtidal Sandy Community: Zuma Beach Jon Kastendiek, Ph.D.

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  1. Shallow Subtidal Sandy Community:Zuma BeachJon Kastendiek, Ph.D.

  2. Dendraster Community – Zuma Beach

  3. Dendaster – Suspension feeder - aboral

  4. Dendaster – Suspension feeder - aboral

  5. Astropecten – Predator of Renilla

  6. Renilla kollokeri – suspension feeder

  7. Armina – Predator of Renilla

  8. Dendraster Community – Zuma Beach

  9. Wave Zone Renilla<2cm Renilla and Armina WINTER Dendraster Astropecten and Renilla>4cm

  10. Wave Zone SUMMER

  11. Wave Zone WINTER

  12. Factors affecting distributions • Physical factors • Surge/downwelling • Substrate type • Depth • Biological factors • Predation • Competition • Symbioses

  13. Experimental Manipulations Physical factors

  14. Wave Zone SUMMER

  15. Wave Zone EXPERIMENT: Transplant Dendraster

  16. Wave Zone EXPERIMENT: Transplant Astropecten

  17. Wave Zone EXPERIMENT: Remove Dendraster

  18. Wave Zone EXPERIMENT: Transplant Renilla>2cm

  19. Wave Zone EXPERIMENT: Transplant Armina

  20. Experimental Manipulations Biological factors

  21. Armina, Astropecten and Renilla feeding predation synergy

  22. Feeding synergy between Armina and Astropecten on Renilla (<4cm rachis diam.)

  23. Wave Zone EXPERIMENT: Dendraster removal; Renilla transplant

  24. Competition Experiments Controlled Field Experiments (Manipulations)

  25. Wave Zone Renilla<2cm Renilla and Armina WINTER Dendraster Astropecten and Renilla>4cm

  26. Wave Zone EXPERIMENT: Result of Dendraster removal

  27. Wave Zone EXPERIMENT: Dendraster removal; Renilla transplant No further removal of Dendraster Renilla excluded

  28. Wave Zone EXPERIMENT: Dendraster removal; Renilla transplant Continuous removal of Dendraster Renilla persists

  29. Wave Zone Renilla<2cm Renilla and Armina WINTER Dendraster Astropecten and Renilla>4cm

  30. Conclusions • Upward distribution bound of Renilla, Astropecten and Dendraster dictated by physical factor of current/surge • Astropecten distribution also lower due to competition for space with Dendraster • Only large Renilla (>4cm) found below Dendraster due to Astropecten predation • Small Renilla (>2cm) have refuge from predators in upper area due to surge

  31. Wave Zone SUMMER

  32. Wave Zone WINTER

  33. END

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