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Why Ichthyology?

11:45-12:35 ZOO: 4926 August 25, 2011. Why Ichthyology?. Jimmy Liao (jliao@whitney.ufl.edu). Outline. Diversity 32,000 species in FishBase Morphology, physiology, habitat “Simplicity” Accessibility. fishes. tetrapods.

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Why Ichthyology?

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  1. 11:45-12:35 ZOO: 4926 August 25, 2011 Why Ichthyology? Jimmy Liao (jliao@whitney.ufl.edu)

  2. Outline • Diversity • 32,000 species in FishBase • Morphology, physiology, habitat • “Simplicity” • Accessibility

  3. fishes tetrapods

  4. Deepest fish: Abyssobrotula galatheae 8,370 meters (Puerto Rico Trench)

  5. Highest fish: Orestiascuvieri4,570 meters (Lake Titicaca, Andes)

  6. Largest fish: saltwater =Rhincodontypus(95,000 lbs, 12.6 m, 40 feet) freshwater = Husohuso(3m, 10 feet, 3250 lbs) Smallest fish: Trimmatomnanus(10 mm)

  7. Longest fish: Regalecusglesne(11m) Coldest fish: Cryodracoantarticus(-2° C)

  8. “Last”fish: Panderichthys Synapomorphy= shared, derived trait 1) fin rays on lobed fin 2) operculum, suboperculum

  9. “First” amphibian: Acanthostega Synapomorphy= shared, derived trait 1) digits 2) lost operculum

  10. fishes tetrapods

  11. escape, swimming struggling

  12. 1 mm

  13. 1 mm

  14. Hale et. al. 2001

  15. What are the functions of different spinal neurons? patch recording electrical stimulus motor root recordings GFP-labeled glycinergic spinal interneurons 2. Is activity correlated with cell morphology?

  16. motor behavior n = 75 n = 23 e + sw (4) sw (8) neuronal activity repertoire (%) st (100) (88) sw + st • Design of neural circuits CoBL CoLA struggling swimming + struggling

  17. n = 75 n = 23 n = 34 e + sw (4) sw (8) n (12) repertoire (%) st (100) (88) e (88) sw + st • Design of neural circuits CoBL CoLA CoLO struggling escape swimming + struggling

  18. Shared Dedicated • Design of neural circuits CoBL CoLA CoLO struggling escape swimming + struggling

  19. Whitfield et al. 1996 Hair cells in hearing P2 P3 P4 P1 P5 P6 P7 P9 D2 D1 P8 OC1

  20. neuro afferent neurons neuro neuromast lateral line ganglion neurons afferent

  21. posterior lateral line P2 P3 P4 P1 P5 P6 P7 P9 D2 D1 P8 OC1 • How does the LL encode hydrodynamic information?

  22. 120 100 80 60 velocity (mm/s) 40 * 20 0 0 1 2 3 4 5 6 7 pressure (psi) Electrophysiology

  23. 120 100 80 60 velocity (mm/s) 40 * 20 0 0 1 2 3 4 5 6 7 pressure (psi) motor root 20 mV 0.5 s water jet Electrophysiology PLL neuron

  24. neuro transgenic GFP fish neuro HUC GFP Autoneuron Merge 44.8 ± 7.8 neurons for every 12 neuromasts( n= 7 animals)

  25. Development using HUC Kaeda Amina Kinkhabwala

  26. Visualizing neural activity

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