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Conservation Science for a Healthy Planet

Diversity of large animals plays an important role in carbon cycle

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October 10, 2017 Stanford University read full ScienceDaily article here

With abundant data on plants, large animals and their activity, and carbon soil levels in the Amazon, research suggests that large animal diversity influences carbon stocks and contributes to climate change mitigation….

…”It’s not enough to worry about the trees in the world holding carbon. That’s really important but it’s not the whole story,” said Fragoso. “We also have to worry about maintaining the diversity and abundance of animals, especially mammals at this point, in order to ensure a well-functioning carbon cycle and the retention of carbon in soils.”

Although scientists have long understood that animals — through ingestion, digestion, breathing and decomposition — are part of the carbon cycle, the work, published Oct. 9 in Nature Ecology and Evolution is the first to suggest the importance of animal biodiversity rather than just animal numbers in the carbon cycle.

If we want to increase carbon sequestration, we have to preserve not only high numbers of animals but also many different species, the authors said.

…The researchers found that soil had the highest carbon concentrations where they saw the most vertebrate species. When they looked for a mechanism that could explain this relationship, it turned out that the areas with highest animal diversity had the highest frequency of feeding interactions, such as animals preying on other animals or eating fruit, which results in organic material on and in the ground. The researchers suggest that these meal remnants bump up diversity and abundance of soil microbes, which convert the remains into stored carbon

Mar Sobral, Kirsten M. Silvius, Han Overman, Luiz F. B. Oliveira, Ted K. Rabb, José M. V. Fragoso. Mammal diversity influences the carbon cycle through trophic interactions in the Amazon. Nature Ecology & Evolution, 2017; DOI: 10.1038/s41559-017-0334-0

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