As the nights get longer in the fall, trees receive less direct sunlight, and chlorophyll, which trees use to absorb sunlight during photosynthesis, begins to break down, displaying the natural pigments within the leaves
HALIFAX — The customary reds, oranges and yellows of the trees, marking the arrival of fall, may have appeared early this year, or not at all.
Mason MacDonald, an assistant professor of environmental sciences and agriculture at Dalhousie University, said the colours he’s seen so far this autumn don’t compare to the brilliant reds and oranges Nova Scotians are used to. “This year we got more rain than is typical for us, and along with that we had a whole bunch of these dark, grey, cloudy days. That's what happened. We didn't get the sun we would normally get. Therefore, they can't make those colours,” MacDonald said.Sean Thomas, a professor of forest ecology at the University of Toronto, says there is anecdotal evidence to suggest that smoke from wildfires in northern Ontario this summer may have triggered trees to reveal their colours prematurely.
“There is good reason to think that climate change will disrupt that normal leaf colouration that we see,” Thomas said.
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