image: This is a diverse old growth forest ravine. This image relates to a paper that appeared in the May 18, 2012, issue of Science, published by AAAS. The paper, by Daniel J. Johnson at Indiana University in Bloomington, Ind., and colleagues was titled, "Conspecific Negative Density Dependence and Forest Diversity." view more
Credit: Image © <i>Science</i>/AAAS