5_WaterBalanceGasExchange

Collection capillary mechanism to move water across

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Unformatted text preview: pillary mechanism to move water across skin to mouth Moloch horridus Agamidae, Australia Phrynosoma cornutum Phrynosomatidae, USA convergent evolution different clades, different continents, same problem (desert) - desert lizards drink water that condenses on skin as they enter cool burrows - South African tortoises collect water in shells during rainfall scale hinge joints expanded, form interconnected channel system Water Balance Desert anurans - special adaptations: - accumulate urea => increase osmolarity of body fluids => increase efficiency of H2O absorption - amphibians & reptiles obtain water with food uptake (70-80% of water from prey) Metabolic water - amount usually minimal Metabolism of fat => 110 grams of water per 100 grams Metabolism of protein => ca 40 grams of water per 100 grams Metabolism of starch => ca 55 grams of water per 100 grams Water Balance Loss - evaporation - urine/feces Amphibians: highly permeable skin => evaporative water loss - especially at high temperature or low humidity - for some skin is basically no barrier to water loss (Salamanders, esp....
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