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Moss: The Breakfast of Champions

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It's not just carbon dioxide that feeds a forest. Trees also depend on nitrogen to grow. And the best buffet of nitrogen comes from moss-loving bacteria. But to get a really nutritious growth of bacteria going, the moss needs to age.

Bacteria, called cyanobacteria, that grow on centuries-old tree moss, are twice as effective at fixing nitrogen as the same type of bacteria living in moss on the ground, according to research by Zoë Lindo of McGill University.

That means old-growth trees may be vitally important to the long-term survival of the coastal temperate rainforests that stretch from Southern Alaska to Northern California.

BLOG: Longest-Living Tree Growing Faster With Warming

“What we’re doing is putting large old trees into a context where they’re an integral part of what a forest is,” said Lindo in a McGill University press release.

“These large old trees are doing something: they’re providing habitat for something that provides habitat for something else that’s fertilizing the forest. It’s like a domino effect; it’s indirect but without the first step, without the trees, none of it could happen,” said Lindo.
 
 

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