Curious Nature: Fire! Where do the animals go and how do the plants survive? (column)
July 28, 2018
Remember "Bambi"? Most of the movie included picturesque forest scenes of flowers and friendly skunks, but toward the end, there was that chaotic scene where fire spreads through the forest and the animals flee.
Bambi and his father barely escape the fire, running through rivers and dodging burning embers, and finally join their friends (and Bambi's love, Faline) on a small island in true Disney style. "Bambi" (the movie, not the deer) and Smokey the Bear have been accused of impacting decades of attitudes and actions about wildfires, and that may be true to some extent, but there are a few things they both get right.
By this time, most of us understand that fires, while they can be dangerous and destructive, serve an ecological purpose. And even in "Bambi," after the fire we start to see some of the regrowth in the forest almost immediately, as the bright Disney flowers bloom in the ashes.
But if you're wondering about the animals, then "Bambi" got that (at least partially) right, too, in that most animals simply flee from fire in any way they can, by wing or by hoof. Now this, of course, presents other problems, and it's been documented that predators sometimes take advantage of these fleeing masses of prey. We didn't see this in "Bambi."
After the huge fires in Yellowstone National Park in 1988, some people thought the park, closed in its entirety for the only time in its history, would be littered with animal carcasses. But as it turns out, of the park's estimated 40,000 to 50,000 elk, only about 345 elk were lost. Beyond this, they documented the loss of 36 mule deer, 12 moose, six black bears, nine bison and one grizzly (out of 21 radio collared grizzlies).
And while exact counts weren't made, it was hypothesized that rodents suffered the highest losses, partly due to their tendency to burrow into the ground to escape the flames and partly due to increased predation from the loss of vegetative cover directly after the fire.
Recommended Stories For You
So what about plants? Does anyone feel badly about the loss of beautiful wildflowers or statuesque trees? You needn't. Plants with shorter lifespans that depend on the regular sprouting of seeds simply weather the fire as seeds, stored in various places in the soil bank. Many other plants are capable of re-sprouting from rootstocks, also buried in the soil.
And, of course, there are the famous, fire-adapted species that actually depend on fire to reproduce, like our local lodgepole pines. These trees use the heat from the fire to melt away the wax that holds their cones closed, allowing the seeds to take root in the fresh, fertile ash with very limited competition from mature trees.
So while fire is natural and all that, it's still fairly scary and potentially life threatening, especially for us feeble humans who are less equipped to flee from the fire on our own. And I would be remiss if I did not mention that, even in the movie "Bambi," it is man who starts the fire.
So in these dry days where fires are already blazing, let's all make sure we don't add to the problem. Be safe with fire and, when in doubt, don't. And, finally, just a word of thanks to all of the first responders out there who are saving homes and keeping people safe. We appreciate you, the work that you do and the sacrifices you make. Thank you.
Jaymee Squires is the director of graduate programs at Walking Mountains Science Center in Avon. She is missing campfires this summer, but happy to do her part, and enjoying dark views of starlit skies.