One of the great infrastructure challenges of the next few decades is to figure out which coastal sites should be abandoned and which can be saved. That green and grey stuff that grows on trees can help. (via hakaimagazine)
The clock is ticking for many low-lying coastal areas. Sea level is rising faster than at any time in recorded history, promising to radically redraw the map. At a broad scale, we know this to be true. But knowing precisely which plots will be inundated and which will remain dry land is a much more daunting task. That effort may have an ally almost no one would have guessed: one of the smallest and least conspicuous forms of life—lichens.
“Lichens are a good indicator of site history,” says Rosentreter, who has studied lichens and related species for over 40 years. Specifically, the species of lichens that grow on a coastal site may be an effective indicator of low levels of saltwater intrusion and spray, which can be caused by infrequent flooding or storm events.
It takes more than just salt sensitivity to make a lichen a good indicator of whether a site has experienced the first effects of sea level rise. The lichen’s own life history also comes into play.
France Dernières Nouvelles, France Actualités
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