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Productivity increases with species diversity, just as Darwin predicted

Date:
May 13, 2013
Source:
University of Toronto
Summary:
Environments containing species that are distantly related to one another are more productive than those containing closely related species, according to new research.
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Wildflowers and grasses in Dorset, UK (stock image). Environments containing species that are distantly related to one another are more productive than those containing closely related species, new research finds.
Credit: © david crosbie / Fotolia

Environments containing species that are distantly related to one another are more productive than those containing closely related species, according to new research from the University of Toronto Scarborough (UTSC).

The experimental result from Marc William Cadotte confirms a prediction made by Charles Darwin in "On the Origin of Species", first published in 1859. Darwin had said that a plot of land growing distantly related grasses would be more productive than a plot with a single species of grass.

Since then, many experiments have shown that multi-species plots are more productive. Cadotte's experiment showed for the first time that species with the greatest evolutionary distance from one another have the greatest productivity gains.

"If you have two species that can access different resources or do things in different ways, then having those two species together can enhance species function. What I've done is account for those differences by accounting for their evolutionary history," Cadotte says.

Cadotte grew 17 different plants in various combinations of one, two, or four species per plot. As in previous experiments, he found that multi-species plots produced more plant material. But when he analyzed the results he also found that combinations of plants that were distantly related to one another were more productive than combinations of plants that were closely related. So, for instance, a plot planted with goldenrod and the closely related black-eyed susan wasn't as productive as a plot with goldenrod and the more distantly related bluestem grass.

What's going on isn't mysterious, Cadotte says. Distantly related plants are more likely to require different resources and to fill different environmental niches -- one might need more nitrogen, the other more phosphorus; one might have shallow roots, the other deep roots. So rather than competing with one another they complement one another.

What's interesting about his result is that evolutionary distance is all you need to know to predict productivity. The result suggests that as plant species disappear Earth will become less productive, and plants will draw even less carbon from the atmosphere, possibly increasing the rate of global warming.

On the other hand, the results could give a valuable tool to conservation efforts. Environmentalists trying to restore damaged habitats could use the information to help them pick which combinations of species to introduce.


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The above post is reprinted from materials provided by University of Toronto. Note: Materials may be edited for content and length.


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University of Toronto. "Productivity increases with species diversity, just as Darwin predicted." ScienceDaily. ScienceDaily, 13 May 2013. <www.sciencedaily.com/releases/2013/05/130513152830.htm>.
University of Toronto. (2013, May 13). Productivity increases with species diversity, just as Darwin predicted. ScienceDaily. Retrieved August 3, 2015 from www.sciencedaily.com/releases/2013/05/130513152830.htm
University of Toronto. "Productivity increases with species diversity, just as Darwin predicted." ScienceDaily. www.sciencedaily.com/releases/2013/05/130513152830.htm (accessed August 3, 2015).

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