5_WaterBalanceGasExchange

Samerica litoria caerulea australia poypedates

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Unformatted text preview: p. (SAmerica) Litoria caerulea (Australia) Poypedates maculatus (India) Water Balance preventing water loss B) structure of skin different - dermal layer of skin contains more iridophores, (reflective pigment cells; reflect light like mirror) => lower radiation absorption => lower temperature => reducing water loss Chiromantis (Rhacophoridae) Hyperolius (Hyperoliidae) Water Balance preventing water loss C) cocoon formation - cocoon is shed layers of stratum corneum - burrow in still moist soil, then start to accumulate cocoon - independently evolved in several lineages some frogs, few salamanders - evaporation Water Balance Urine: fluid with N wastes and ions Ammonia - very soluble; readily diffuses across skin & gills - energetically cheap - very toxic - cannot be stored - aquatic species (Xenopus); larva, tadpoles Loss Urea - very soluble energetically expensive non-toxic can be stored terrestrial species - urine/feces Uric acid - insoluble - energetically expensive - non-toxic - saves water - desert species (“waterproof” frogs, reptiles) uricotelic: Phyllomedusa, Chiromantis nitrogen excretion m...
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This document was uploaded on 03/17/2014 for the course BIO SCI 440 at Wisconsin Milwaukee.

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