A botanical sea change is underway along the Floridian coastline, where new research suggests that global warming is helping mangroves stretch their strange tentacle-like roots northward.
Mangrove forests -- coastal trees and shrubs that live semi-submerged lifestyles -- are among the world's most productive and valuable ecosystems, home to many fish and other wildlife in tropical climates. But experts worry that their northerly march will come at the expense of other habitats.
Mangroves cannot survive if nighttime temperatures get too cold. The decline in frosty nights of less than 25 degrees appears to be helping them displace cold-tolerating marshy grasslands.
Scientists analyzed nearly 30 years of satellite data and concluded that the density of mangroves has doubled in some parts of Florida's northeast corner.