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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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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
Deepest fish: Abyssobrotula galatheae 8,370 meters (Puerto Rico Trench)
Highest fish: Orestiascuvieri4,570 meters (Lake Titicaca, Andes)
Largest fish: saltwater =Rhincodontypus(95,000 lbs, 12.6 m, 40 feet) freshwater = Husohuso(3m, 10 feet, 3250 lbs) Smallest fish: Trimmatomnanus(10 mm)
Longest fish: Regalecusglesne(11m) Coldest fish: Cryodracoantarticus(-2° C)
“Last”fish: Panderichthys Synapomorphy= shared, derived trait 1) fin rays on lobed fin 2) operculum, suboperculum
“First” amphibian: Acanthostega Synapomorphy= shared, derived trait 1) digits 2) lost operculum
fishes tetrapods
escape, swimming struggling
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?
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
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
Shared Dedicated • Design of neural circuits CoBL CoLA CoLO struggling escape swimming + struggling
Whitfield et al. 1996 Hair cells in hearing P2 P3 P4 P1 P5 P6 P7 P9 D2 D1 P8 OC1
neuro afferent neurons neuro neuromast lateral line ganglion neurons afferent
posterior lateral line P2 P3 P4 P1 P5 P6 P7 P9 D2 D1 P8 OC1 • How does the LL encode hydrodynamic information?
120 100 80 60 velocity (mm/s) 40 * 20 0 0 1 2 3 4 5 6 7 pressure (psi) Electrophysiology
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
neuro transgenic GFP fish neuro HUC GFP Autoneuron Merge 44.8 ± 7.8 neurons for every 12 neuromasts( n= 7 animals)
Development using HUC Kaeda Amina Kinkhabwala