Posted April 17, 2019
Last modified May 15, 2019
By Tom Groening
Friends tell friends the truth, even when it’s unpleasant.
And that’s what the nonprofit Friends of Casco Bay group—which marks its 30th anniversary this year—is doing, reporting on the health of that busy, diverse bay. At three public events this spring, in Portland, South Portland, and Brunswick, Friends of Casco Bay staff reported on the bay’s threats and the responses needed.
Some of the hard truths have been well publicized, like the July 26 incident in which Portland’s East End sewage treatment plant inadvertently released 1.69 million gallons of partially-treated wastewater into Casco Bay.
Other hard truths are observed only through sensitive monitoring equipment, which shows more acidic waters, more calcium carbonate, rising phosphorous, and lower oxygen levels.
Mike Doan, who has been with the Friends organization for more than 20 years and is a research associate, offered a primer for the audience of about 100, mostly supporters of the organization’s work, at Southern Maine Community College in South Portland on March 25.
“Climate change is happening faster than we could have expected,” he said. For most of the previous 30 years, the organization would be out on the bay doing monitoring work two or three times a month. Now, such assessments must be done more frequently, and with more sophistication, using data monitoring equipment placed in specially licensed lobster traps.
“We’re seeing more rain,” Doan said, with the bay seeing 6 inches more precipitation in 2018, on average, than in 1895.
Cathy Ramsdell, left, is executive director of Friends of Casco Bay, and Mary Cerullo is associate director.
Run-off brings nitrogen from lawn fertilizers, agricultural operations, and storm drains into the bay.
“Just as nitrogen fertilizes your lawn, it fertilizes algae in the water,” he said. Ivy Frignoca, who serves as the Friends’ bay keeper, showed slides of recent algal blooms that killed clams and worms on a tidal mud flat.
“And, as ocean temperatures increase, there are more and more invasive green crabs, that just demolish the juvenile clam populations,” she said. Recent research in Casco Bay has shown that less than 1 percent of soft-shell clams are reaching maturity, she added.
Copepods, a primary food for juvenile lobster, are suffering from hostile, warmer waters, Frignoca said, and those warmer waters also correspond with more shell disease in lobster.
Among the improvements the Friends have helped implement is the requirement that wastewater treatment plants monitor nitrogen levels in their discharge.
Frignoca also noted that the Friends and several other nonprofits have urged the legislature to create a science and policy advisory council to guide the state response to many of the challenges wrought by climate change.
The group also is working to allow volunteers to conduct monitoring of the bay.
“It’s key for us to engage you,” said Cathy Ramsdell, executive director of the Friends, told the audience.
Casco Bay by the numbers
- 578 miles of shoreline
- 200 square miles of water
- Eight official lighthouses and eight historic forts
- 13 municipalities from Cape Elizabeth to Phippsburg, including Long Island and Chebeague Island, abut Casco Bay
- 1 in 5 Mainers live in the 42 communities of the Casco Bay watershed, from Bethel to the bay
- 1990 Casco Bay was designated an Estuary of National Significance under the Clean Water Act.