Friends of Casco Bay released a report Wednesday showing that the waters of the bay are warming by roughly 1 degree per decade, which the group said will have significant ecological impacts.
Casco Baykeeper Ivy Frignoca said the rate of temperature change is alarming. In recent winters, the bay hasn’t dipped below 32 degrees Fahrenheit, which creates a comfortable environment for invasive green crabs.
And in summer, the nearshore waters can be as warm as 80 degrees. Frignoca said the warmer water — which holds less dissolved oxygen — combined with algae blooms, can cause problems like the dieoff of softshell clams in Maquoit Bay over the summer.
And she said warming waters can also harm eelgrass, which is critical habitat for many species in the bay.
“The trends we are observing are causing concern, and confirming that Casco Bay is changing, and changing quickly, in response to excess greenhouse gas emissions,” Frignoca said.
The temperature data also show that the Bay’s three warmest years on record have occurred in the past five years.
This article appears through a media partnership with Maine Public.
