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DATE: May 2, 2012 10:25:00 AM PDT
Research of WWU Biologist Shows Ecosystem Effects of Biodiversity Loss Could Rival Impacts of Climate Change and Pollution

EDITORS: High-resolution photos are available at http://news.wwu.edu/go/doctype/1538/21453/

Contact:  Western Washington University Professor of Biology David Hooper at (360) 650-3649 or david.hooper@wwu.edu.

BELLINGHAM — Loss of biodiversity appears to impact ecosystems as much as climate change, pollution and other major forms of environmental stress, according to a new study from an international research team headed by Western Washington University’s Dave Hooper.

Former WWU graduate student Daniel Slakey samples plant diversity while investigating the encroachment of exotic species as part of the research of Western Biology Professor David Hooper.

The study is the first comprehensive effort to directly compare the impacts of biological diversity loss to the anticipated effects of a host of other human-caused environmental changes.

The results highlight the need for stronger local, national and international efforts to protect biodiversity and the benefits it provides, according to the researchers, who are based at nine institutions in the United States, Canada and Sweden.

The study is scheduled for online publication in the journal “Nature” on May 2, and can be viewed online at http://www.nature.com/nature.

“Some people have assumed that biodiversity effects are relatively minor compared to other environmental stressors,” said Hooper, the lead author of the “Nature” paper. “Our new results show that future loss of species has the potential to reduce plant production just as much as global warming and pollution.”

Studies over the last two decades have demonstrated that more biologically diverse ecosystems are more productive. As a result, there has been growing concern that the very high rates of modern extinctions – due to habitat loss, overharvesting and other human-caused environmental changes – could reduce nature’s ability to provide goods and services like food, clean water and a stable climate.

But until now, it’s been unclear how biodiversity losses stack up against other human-caused environmental changes that affect ecosystem health and productivity.

WWU Biology professor David Hooper and graduate student Leslie Gonzalez measure plant diversity and productivity in experimental grassland plots in California. The Nature study uses results from over 100 experiments like this, that directly manipulate diversity under common environmental conditions. Photo: Jeff Dukes.

In their study, Hooper and his colleagues used combined data from a large number of published studies to compare how various global environmental stressors affect two processes important in all ecosystems: plant growth and the decomposition of dead plants by bacteria and fungi. The new study involved the construction of a data base drawn from 192 peer-reviewed publications about experiments that manipulated species richness and examined the impact on ecosystem processes.

The global synthesis by Hooper and his colleagues found that in areas where local species loss this century falls within the lower range of projections (loss of 1 to 20 percent of plant species), negligible impacts on ecosystem plant growth will result, and changes in species richness will rank low relative to the impacts projected for other environmental changes.

In ecosystems where species losses fall within intermediate projections (21 to 40 percent of species), however, species loss is expected to reduce plant growth by 5 to 10 percent, an effect that is comparable in magnitude to the expected impacts of climate warming and increased ultraviolet radiation due to stratospheric ozone loss.

At higher levels of extinction (41 to 60 percent of species), the impacts of species loss ranked with those of many other major drivers of environmental change, such as ozone pollution, acid deposition on forests, and nutrient pollution.

“Within the range of expected species losses, we saw average declines in plant growth that were as large as changes seen in experiments simulating several other major environmental changes caused by humans,” Hooper said. “I think several of us working on this study were surprised by the comparative strength of those effects.”

The strength of the observed biodiversity effects suggests that policymakers searching for solutions to other pressing environmental problems should be aware of potential adverse effects on biodiversity, as well, the researchers said.

“Loss of biological diversity due to species extinctions is going to have major impacts on our planet, and we better prepare ourselves to deal with them,” said University of Michigan ecologist Bradley Cardinale, one of the co-authors.

Still to be determined is how diversity loss and other large-scale environmental changes will interact to alter ecosystems. “The biggest challenge looking forward is to predict the combined impacts of these environmental challenges to natural ecosystems and to society,” said J. Emmett Duffy of the Virginia Institute of Marine Science, a co-author of the paper.

Authors of the Nature paper, in addition to Hooper, Cardinale, and Duffy, are E. Carol Adair of the University of Vermont and the National Center for Ecological Analysis and Synthesis, Jarrett E.K. Byrnes of the National Center for Ecological Analysis and Synthesis, Bruce A. Hungate of Northern Arizona University, Kristen L. Matulich of University of California Irvine, Andrew Gonzalez of McGill University, Lars Gamfeldt of the University of Gothenburg (Sweden) and Mary I. O’Connor of the University of British Columbia and the National Center for Ecological Analysis and Synthesis.

Funding for the study included grants from the National Science Foundation and the National Center for Ecological Analysis and Synthesis.

“This analysis establishes that reduced biodiversity affects ecosystems at levels comparable to those of global warming or air pollution,” said Henry Gholz, program director in the National Science Foundation’s Division of Environmental Biology.

“With this work, Professor Hooper and his colleagues have contributed significantly to our further understanding of the complexities of ecosystem dynamics, and its importance to society,” said Jeff Wright, dean of the College of Sciences and Technology at Western. “Acknowledgement of the quality and rigor of this work through publication in a journal of the stature of “Nature” is one more example of the many valuable scientific contributions made by Western scholars.”

For more information on Hooper’s research or the “Nature” article, contact Hooper at (360) 650-3469 or david.hooper@wwu.edu.

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