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Press Release 11-201

Over the Hump: Ecologists Use Power of Network Science to Challenge Long-Held Theory

Global sampling of 48 sites on five continents yields unprecedented data set

Bugle lily.

Bugle lily at the Mt. Gilboa study site in South Africa.
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September 22, 2011

For decades, ecologists have toiled to nail down principles explaining why some habitats have many more plant and animal species than others.

Much of this debate is focused on the idea that the number of species is determined by the productivity of the habitat.

Shouldn't a patch of prairie contain a different number of species than an arid steppe or an alpine tundra?

Maybe not, says an international team of scientists that pooled its resources to re-evaluate the relationship between species numbers and habitat productivity.

The innovative, standardized global sampling of 48 sites on five continents yielded an unprecedented data set.

"Our study shows no clear relationship between productivity and the number of plant species in small study plots," says Utah State University plant ecologist Peter Adler.

Scientists say Adler's and his colleagues' findings represent a significant advance in ecological thought. The findings appear in this week's issue of the journal Science.

"We challenged a prevailing model developed in the early 1970s by British ecologist J. Philip Grime," says Adler, lead author of the paper. "He proposed that the number of species rises then declines with increasing productivity."

Though hotly debated, this "hump-shaped" model has remained a textbook standard for nearly four decades.

"In the search for underlying principles of ecology in a very complex natural world, it's inevitable that even long-standing and accepted theories will be debunked as more data are accumulated and synthesized," says Henry Gholz, program director in the National Science Foundation's (NSF) Division of Environmental Biology, which funded the research.

In an "Emperor's New Clothes" moment, Adler remembers skeptical observations about the hump-shaped model made by graduate students in his classroom.

"'Why do ecologists spend so much time on this model when the evidence to support it is so weak?' they asked me," he says. "That was the kick I needed to pursue this question."

The challenge was daunting.

Existing, disparate case studies couldn't conclusively support Grime's unimodal pattern. Inconsistencies in data collection methods further hampered efforts to distill evidence to support the hump-shaped model.

So Adler and fellow ecologists formed the Nutrient Network, or "NutNet," an NSF Research Coordination Network dedicated to investigating biodiversity and ecosystem processes in grasslands around the world.

Based at the University of Minnesota (UMN), the network is funded by an NSF grant to network organizers and UMN scientists Elizabeth Borer and Eric Seabloom.

"Our work not only sheds light on this classic question, it also demonstrates the power of a network approach," Borer says. "NutNet data are poised to inform many pressing ecological questions. Similar global, grassroots collaborations could help settle other longstanding scientific debates."

Says Gholz, "Research Coordination Networks are designed to facilitate these types of insights into the functioning of nature, insights that aren't possible in a focus on individual ecosystems."

Adler says that NutNet's data "emphasize the need to consider many factors to explain patterns of diversity--not just productivity alone."

NutNet's findings should spur ecologists to focus on other important factors regulating biodiversity, he says, such as evolutionary history, disturbance and resource supply.

"It's time to remove outdated models from our textbooks and concentrate on more sophisticated approaches," Adler says.

"That will improve our ability to predict the effects of environmental change on biodiversity."


Media Contacts
Cheryl Dybas, NSF, (703) 292-7734,
Mary Ann Muffoletto, USU, (435) 797-3517,

Related Websites
Nutrient Network:

The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2016, its budget is $7.5 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives more than 48,000 competitive proposals for funding and makes about 12,000 new funding awards. NSF also awards about $626 million in professional and service contracts yearly.

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Biologist Peter Adler at a field research site.
Biologist Peter Adler at a field research site in eastern Idaho.
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Scientist Elizabeth Borer sampling species at a wildlife reserve.
Scientist Elizabeth Borer sampling species at the William L. Finley NWR in Oregon.
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Oak trees and plants at the Cowichan Garry Oak Preserve study site.
The Cowichan Garry Oak Preserve study site in British Columbia, Canada.
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A person looking at Billy Buttons in bloom.
Billy Buttons in bloom at Falls Creek, Bogong Joslin Moore High Plains, Australia.
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Grasslands in China.
The alpine grassland study site in Gansu Province, China.
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Cover of the September 23, 2011 issue of the journal Science.
The researchers' work is described in the September 23, 2011 issue of the journal Science.
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