"It is not just the quantity of species diversity that matters, it is also the quality of genetic diversity," said lead author Mike Madritch, an ecology doctoral student at UGA. Madritch studied carbon and nitrogen fluxes during decomposition of leaf litter and found a significant link between nutrient output and the genetic variation of the leaves.
The study was co-authored with Mark Hunter, associate professor of ecology at UGA, and published this week in the Ecological Society of America's journal, Ecology. The research was funded by the National Science Foundation and the Andrew W. Mellon Foundation.
The study was conducted on a turkey oak (Quercus laevis Walter) sandhills community at UGA's Savannah River Ecology Laboratory in Aiken, SC where Madritch and Hunter analyzed the decomposition of nine different single tree litter treatments and one mixed treatment that contained litter from all nine trees of the same species. They found a marked difference in the amount of carbon and nitrogen released based upon the parentage of the leaf litter.
"Diversity matters," said Madritch. "Our study shows that bringing a species population back from the brink of extinction to its original levels would not have the same effect on the environment as if the species never faced being endangered in the first place. When you build back from an endangered population, you necessarily are building from a limited gene pool, and we found that the variety in the genetic make-up matters to the system."
The researchers found not only that a reduction in genetic biodiversity affects the way an ecosystem functions, but they also found that a loss in genetic diversity reduces the p
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Contact: Kim Carlyle
kosborne@uga.edu
706-583-0913
University of Georgia
20-Aug-2002