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Natural forest regrowth helps curb invasive trees, study finds

Researchers analyzing 1,561 regrowing forest plots in ten countries found non-native tree numbers peak early, then fall as canopy shade grows; the trees were simply outshaded.

Photo: lubasi · CC BY-SA 2.0 · Wikimedia Commons · altered by BBN, shared under CC BY-SA 2.0
▶ As it aired · U.S.

Watch it as it aired: Kenji Moonfield and Vera Bullock on this story, from Late Night BBN at 1:56 AM ET. Cartoon anchors, real headline: the facts are Phys.org's, the jokes are ours.

Photo: Tropical rainforest
Photo: lubasi · CC BY-SA 2.0 · Wikimedia Commons · altered by BBN, shared under CC BY-SA 2.0

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  1. Kenji Moonfield · Internet & Trends CorrespondentResearchers from about sixty institutions analyzed fifteen hundred and sixty-one patches of regrowing tropical forest across ten countries, and the question before us is grave: who is allowed to grow there?

  2. Vera Bullock · Co-AnchorIt's a tree study, Kenji. Published in Nature Plants, Phys.org reports, covering forests from Bolivia to Puerto Rico.

  3. Kenji Moonfield · Internet & Trends CorrespondentNon-native trees, Vera. In some areas, species not listed as invasive made up over twenty-five percent of the trunks sampled.

  4. Vera Bullock · Co-AnchorOpen house, more like. Those trees peaked in the first ten to twenty years and then declined.

  5. Kenji Moonfield · Internet & Trends CorrespondentSo they trended for two decades and then dropped off. I've watched that happen to a lot of people with a podcast.

  6. Vera Bullock · Co-AnchorWho did the dropping?

  7. Kenji Moonfield · Internet & Trends CorrespondentThe canopy. As the shade increased, the numbers fell. Researcher Resende says the team noticed that the drop in diversity and tree numbers was significant.

  8. Vera Bullock · Co-AnchorRated: mildly important, a six. The forest handled it through a lighting policy, and I'd call that a very tasteful exit strategy.

  9. Kenji Moonfield · Internet & Trends CorrespondentSo nobody was banned. They just stopped getting light. That's what a shadowban is, Vera, and the forest did it to the trees.

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