1 / 30

Paradox of the Cichlids outline of my PhD project

Paradox of the Cichlids outline of my PhD project. Thijs Janzen Supervisor: Rampal Etienne. Picture courtesy Jen Reynolds. Cichlids. The success of the cichlids. Pharyngeal jaw Mouthbrooding. Barlow 2000. Oliver 2010. The African Rift Lakes. Differences between the lakes. Lake Victoria.

ebrimer
Download Presentation

Paradox of the Cichlids outline of my PhD project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Paradox of the Cichlidsoutline of my PhD project Thijs Janzen Supervisor: Rampal Etienne Picture courtesy Jen Reynolds

  2. Cichlids

  3. The success of the cichlids • Pharyngeal jaw • Mouthbrooding Barlow 2000

  4. Oliver 2010

  5. The African Rift Lakes

  6. Differences between the lakes

  7. Lake Victoria Lake Tanganyika Lake Malawi

  8. Why should there be more? • Age • Water level • Bathymetry

  9. Waterlevel • Water level changes frequently • King Mwangonde (1820) Owen 1990, Barlow 2000, Salzburger 2002

  10. Why should there be more? • Age • Water level • Bathymetry

  11. Bathymetry Victoria Malawi Tanganyika Talling 1969, Scholz et al. 2007

  12. Water level Water level: 0 m

  13. Water level Water level: -100 m

  14. Water level Water level: -250 m

  15. Water level Water level: -300 m Water level -300 m

  16. Water level Water level: -400 m

  17. Water level Water level: -600 m

  18. Water level Water level: -1000 m

  19. Effects of water level changes • Decrease in lake size • Splitting in proto lakes • Merging of sub-populations after water level rise

  20. Summary of possible causes • Age • Water level • Bathymetry

  21. Research Questions • What external factors determine the differences in biodiversity between the African Rift Lakes? • How does biogeography influence biodiversity?

  22. Approach • Standard neutral model • Influence of environment size • Spatiality • Environmental change • Cyclic environment change • Splitting and merging of communities • Repeated splitting and merging

  23. ApproachTailored model • Check predictions with a tailored version • Correct size of lakes • Include explicit bathymetry • Remodel water level changes

  24. The end • Questions? • Suggestions?

  25. Conformism

  26. Local variability

  27. Picture courtesy Jen Reynolds

  28. Picture courtesy Jen Reynolds

  29. Other stuff to do • Time-scale difference between speciation and environmental change • Interaction between tectonic drift and biodiversity

More Related