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» Create own heat from metabolic processes˃ Birds & mammals (mainly)
» Energy is required to maintain body temp.» Increased respiration
» Higher body temp. than ectotherms» Usually between 36°C ‐ 42°C
» Smaller fluctuations in body temp. » Homeotherm – stable body temperature
»Mainly physiological regulation» Body temp. not uniform
•Warmest at core, cooler at extremities
˃PRO:+Increased habitat diversity+Less vulnerable to temp. changes+Internal reproduction+Increased bacterial protection
˃CONS:+Energetically costly
» Use external sources to regulate body temp.˃ Amphibians & reptiles
» Behavioral means to regulate temp.˃ Getting wet˃ Lying on cool ground˃ Finding shade˃ Climbing onto higher rocks˃ Lay in sun˃ Inflate body
» Large fluctuations in body temp.˃Poikilotherm – body temperature varies
» Relatively even temp. throughout body
˃PRO:+ Less food required+ Afford long periods of time without food
˃CONS:+ Dependent upon environment+ Limited habitable environments+ Limited regulation strategies+ Food acquisition difficult
Environmental Temperature