5_WaterBalanceGasExchange

Plethodontids morphologicalphysiological adjustments

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Unformatted text preview: Plethodontids) morphological/physiological adjustments to reduce water loss: - water storage in bladder (20-50% of body mass can be bladder water in frogs) up to 130% in L. platycephala “water-storage frog” - water storage in bladder (desert tortoise), stomach (lizard), lymph sac (chuckwalla) Water Balance behavioral adjustments to reduce water loss: - adjust daily and seasonal activity - estivation Water Balance behavioral adjustments to reduce water loss: - water conserving position Water Balance behavioral adjustments to reduce water loss: - seek humid / enclosed retreats when inactive - crowding Rates of evaporative water loss lower when in groups Water Balance preventing water loss - “waterproofing” independently evolved in several groups of arboreal frogs => strong selective pressure to conserve water A) minimize cutaneous water loss by dried mucus, lipids, wax Phyllomedusa s...
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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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