Nearly 200 kilometers from the sea, red mangroves thrive in the rainforests along the San Pedro Mártir River on the Yucatán Peninsula. But how did these tangled trees that typically grow in salty water along coasts end up trapped so far inland and in freshwater?
Carlos Burelo has been mulling a version of that question ever since he visited the river on a fishing trip with his father 35 years ago. As a kid, he saw how the mangroves with their twisted aboveground roots were different from other trees, an observation that stuck with him into adulthood as a biologist at the Universidad Juárez Autónoma de Tabasco in Villahermosa,
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