Ectothermy

Question 1

Ectotherm

Answer 1

any animal that does not generate sufficient metabolic heat to warm tissues above ambient temps

Question 2

Poikilotherm

Answer 2

same meaning as ectotherm, but emphasizes the variable nature of Tb in these animals

Question 3

Behavioral thermoregulation

Answer 3

Able to maintain nearly constant Tb due to exploiting microclimates

Question 4

Melanophores

Answer 4

o Cells that contain significant amount of pigment within vesicles called melanosomes
o Animal color can quickly change based on distribution of pigment within cell

Question 5

α-melanophore stimulating hormone (α-MSH)

Answer 5

o Epinephrine & melatonin cause pigment to aggregate in center of cell (light color)
o α-MSH causes pigment dispersal (dark color)

Question 6

Temperature coefficient (Q10)

Answer 6

o Refers to the acute change in any rate process over a 10C span in Tb
o Q10= Rt/R(T-10)

Question 7

Compensation (complete and partial)

Answer 7

chronic exposure to a novel Ta often results in increased performance relative to performance following acute exposure to new temperature