Specific heat of water result: bodies of water (and water-containing bodies of organisms) have great thermal inertia &#150;i.e, don&#146;t change temperature rapidly even when heat is added or withdrawn rapidly large lakes and seas moderate temperature swings on nearby land Effects of Temperature on Poikilotherms Heat budget Organisms can gain or lose heat by four processes: Radiation = emission or absorption of electromagnetic radiation (IR) from an object Conduction = transfer of kinetic energy between substances in contact Convection = bulk movement of liquids or gases of different temperatures, especially over surfaces across which heat is transferred by conduction Evaporation = &quot;consumption&quot; of heat as water goes from liquid to gas (latent heat of fusion) Heat budget in animals Whether animal gains or loses heat by radiation depends on relative temperatures of animal and environment Animal can gain heat by pressing against warm surface or lose it by pressing against cool surface (conduction) Heat budget in plants Plants gain and lose heat by same processes as animals Temperature and distribution Hastings and Turner (1965) determined that saguaro cactus limited to sites that never froze for more than 36 hours Saguaro hardiness Saguaro range also approx.
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