Creative Destruction
 
The Silver Lining: The Benefits of Natural Disasters. By Seth R. Reice. Princeton University Press. 240 pages.
 
by Neil Caudle
 
     
 
Lodgepole pine seedlings thrive 10 years after the Yellowstone fire.
(click image to enlarge)
 

ellowstone Park’s forest fire of 1988. The eruption of Mount Saint Helens in 1980. The deluge of Hurricane Floyd in 1999. It’s hard to imagine an upside to disasters like these. But Seth Reice, associate professor of biology and ecology, is asking us to do just that. Where most of us see only destruction, he sees creative disturbance—a fresh new page in the ongoing story of change.

The ideas in The Silver Lining took shape several years ago as Reice was measuring the diversity of life in North Carolina streams. When he selectively removed one species from the habitat, he found only minor effects on the remaining populations. But then he decided to shake things up.

"I did an experiment in which I picked up baskets of rocks from the stream and shook them," he recalls. Tumbling the rocks eliminated some animals at first, but within two weeks the numbers of animals had rebounded far beyond their original levels. "So then I knew that disturbance was the key," Reice says.

Ecologists have long understood that nature takes some kinds of upsets in stride. Seasonal flooding, for instance, replenishes bottomland soils and stirs up a feast for the fish and their prey. Even fire has its advantages. The longleaf pine, patriarch of North Carolina’s eastern forests, needs fire to expose bare soil to its seeds and to weed out competitive oaks.

But even in examples like these, Reice says, we traditionally have looked for a scripted stability, for systems that seemed to be running according to plan. If the fires or the floods were too disruptive, we would assume they were problems we needed to solve.

Reice doesn’t see things that way. Disturbance, he writes, isn’t the exception, it’s the rule. Plants and animals are always recovering from their last disturbance. And people, Reice thinks, should learn how to go with the flow.

Remember when Hurricane Fran ripped through our woodlots, felling the trees? Reice takes us back to the woods for a visit, to check out what’s popped up to thrive in the light. From the perspective of the fallen tree itself, or the person whose roof it demolished, Fran was some very bad news. But for teeming new colonies of animals and plants, Fran was a breath of fresh air.

Does this mean that natural communities can also bounce back from the damage that humans inflict? Not always. Unfortunately, Reice explains, natural systems haven’t evolved to cope with the extremes of toxic spills, or unbroken acres of pavement, or development that isolates one natural community from another.

If we don’t allow room for some wildness, we are asking for trouble, Reice says. In the chaparral of southern California, for instance, people are building expensive houses on shrub land whose native vocation is fire. "We really have to incorporate science, and ecology in particular, into our thinking and planning and behavior in order to survive in this world," Reice says. "We’ve got to live with nature, and we’ve got to understand that the nature of nature is change."

       
 
   
           
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    Seth Reice's page in Biology
Princeton University Press