Ivalynfyre wrote:I would think that if the temperature was more of an in between between the warm and cool temps, they wouldn't need a gradient, it would already be regulated.
Of course this is coming from information about corn snakes, corns and leos are very different.
The higher temperatures in basking zones aid in digestion, which is why a lot of lizards like to bask right after eating. Withholding the option for the lizard to bask in an optimal digestion temperature can cause a sluggish metabolism(all body systems, not just the digestive tract), and may lead to minor constipation or impaction. When it becomes too cold reptiles go into brumation. Snakes require temperature gradients as well, and will also suffer from constipation or go into brumation if the temperature is not correct.
aeiou wrote:If there wasn't a gradient and for some reason, the gecko got too hot it would have no way to cool down and would end up overheating. My leopard gecko warms up until she's too hot, then she'll step out of her hide, take a drink and go sleep in the cool side of the tank for an hour. If she didn't have that she'd probably walk around aimlessly or lay in the middle of the tank looking sorry for herself.
This exactly. All my lizards engage in similar behavior, and you can even observe wild lizards also move in and out of sun to keep their bodies at an optimal temperature. It's normal. A temperature gradient is needed for all reptiles. In a way mammals exhibit the same thermoregulation behaviors, of moving into the sun when cold, or into the shade when hot, but mammals are
endothermic, so their bodies can tolerate varying temperatures better without ill effect.
Ectothermic animals like reptiles do not have this advantage and must utilize environment to meet their needs. As an example, mammals will shiver to raise body temperature above the temperature of the environment to keep body systems functioning. Reptiles body temperatures remain fairly close to he temperature of the environment, and their systems start to slow in cold weather, rather than speed up.