The amphipod body salinities do not fall on this line for the most part, so they are regulating. Note that when environmental salinity reaches the line, they do conform some. Many animals regulate over some range of conditions but may conform for extreme conditions. Species may conform for some factors and regulate for others. Also, there is no necessary relationship between conforming or regulating and being eury- or stenotopic.
Animals can receive heat from warm surfaces or lose it to cold surfaces.
They are conformers for body temperature. In that case, they are homeotherms. We will look at examples of how poikilotherms, homeothermic ectotherms, and homeothermic endotherms respond and are adapted to dealing with environmental temperatures. Some poikilotherms can adjust the enzymes produced under different conditions to adjust to seasonal change in conditions. Physiological change in response to living in new conditions for some abiotic factor is called acclimation.