Why do lodgepole pine cones open only when there is enough heat?

Lodgepole pine cones are serotinous, meaning they remain closed until exposed to high temperatures, such as those from a forest fire. This adaptation ensures that the seeds are released in conditions favorable for germination, as the heat helps clear competing vegetation and provides nutrient-rich ash. By waiting for these specific conditions, the cones increase the chances of seed survival and successful establishment in a rejuvenated habitat.