5_WaterBalanceGasExchange

Habitat than phylogeny in amphibians gas exchange i

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Unformatted text preview: ore related to habitat than phylogeny in amphibians Gas exchange I. ! Gills II. !Skin III. ! Lungs Gills - all amphibian larva - some aquatic salamanders - never in reptiles Axolotl Ambystoma mexicanum - size of gills related to availability of oxygen - mountain-brook type - pond type Gas exchange Skin - all amphibians use cutaneous respiration to some degree - “waterproof” frogs sacrifice cutaneous respiration in exchange for resistance to water loss Plethodontid salamanders - oxygen uptake ca 1/3 of frogs under similar conditions - limited to cool habitats and non-vigorous activity - tropical ones (Bolitoglossa) active primarily in rainy nights (cooler) Epidermal projections or folds - Increase capacity for cutaneous respiration Telmatobius Hairy Frog Hellbender Skin Aquatic turtles have more permeable skin, - some species have modified cloaca to increase area for gas exchange - buccopharyngeal membranes for gas exchange sufficient for gas exchange during hibernation Lungs - principal respiratory surface in many terrestrial amphibians & reptiles Amphibians: - “Buccal pump mechanism” Lungs Reptiles: - t...
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