BIOL 1070 Lecture Notes - Homeostasis, Food Energy
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WEDNESDAY, NOV 16th!
Conformers: allow internal environment to follow changes in the external environment
Regulators: regulators maintain a constant internal environment (homeostasis) in the face
of varying external environment.
Can an animal be both a conformer and a regulator?
An example, arctic char and hairy caterpillar
Heterothermy: endothermic at cartain times or in certain tissues, but not at all times or in
all tissues. \
Different times? EX.
Different tissues: EX.
-bats, drop metabolic rates, fast no insects.
Which graph represtns ecotherms? Endo thers?
RED- ectotherms BLUE-endotherms
Ectotherms-costs- dependent on environment – limited range of suitable habitats- low
MR, limtits activity
BENEFITS- requires less food energy (less foraging,can avoid predators)
-less energy for metabolism (greater growth, greater reproduction)
-low MR, low respiration, low evaporation, less water loss
ENDOTHERMS- costs- requires more food energy (more foraging, more drinking)
More energy, for metabolism (less growth, less reproduction)
-high MR, high respiration, high evaporation, water loss
BENEFITS- thrive in diverse environ.
High MR, high activity
Constant temp allowed for evolution of efficient metabolic processes( eg. Enzymes)\
Last CLICKER QUES: ANS= C!!
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