45892Battle for Survival May Yield the Rain Forest’ s Diversity - NYT
- Jan 2, 2014http://www.nytimes.com/2014/01/03/science/battle-for-survival-may-yield-the-rain-forests-diversity.html
Battle for Survival May Yield the Rain Forest’s DiversityBy CARL ZIMMER
The diversity of a tropical rain forest can be hard to fathom for people who have not seen one. Three acres of jungle may be home to more than 650 species of trees — more species than grow in the entire continental United States and Canada combined.
It’s tempting to look at all those species living so close together as a picture of peaceful coexistence. But Phyllis D. Coley and Thomas A. Kursar, a husband-and-wife team of ecologists at the University of Utah, see them as war zones. Hordes of insects threaten the survival of plants, which respond with chemical warfare. The result, they argue, is the remarkable biodiversity we see today.
“It’s not harmonious,” Dr. Coley said. “It’s a constant battle to stay alive, to stay in the game.” Dr. Coley and Dr. Kursar outline their hypothesis in this week’s issue of Science.
This hypothesis is a departure from the classical explanation for tropical diversity. Traditionally, ecologists argued that all the species in a tropical forest could coexist through specialization to their physical environment. Some species might be able to live in deep shade, for example, while others could gain minerals beyond the reach of other plants.
But this explanation has fallen out of favor in recent years....