For ectotherms, such as lizards, their body temperature and metabolic rate may change with the environmental temperature. What do researchers call the resting metabolic rate at a given temperature for an ectotherm?

Standard metabolic rate

Explanation:

The resting metabolic rate at a given temperature for an ectotherm is called Standard metabolic rate. On the other hand, the resting metabolic rate at a given temperature for an endotherm is called Basal metabolic rate.

Standard metabolic rate is the minimal metabolic rate required to sustain an organism life at a stipulated temperature. In darkened environment when at rest and unstressed and at post-absorptive state (i. e not actively involved in food digestion), the Standard metabolic rate of an organism can be effectively measured.