November 30, 2012

Bill Nemitz: Maine scientist discovers lobster-eat-lobster world

Cannibal lobsters? They're real, and a local scientist caught them on video.

By Bill Nemitz bnemitz@pressherald.com
Columnist

One minute, Noah Oppenheim was firing up his camera on the ocean floor just off Pemaquid Point in the midcoast of Maine. The next, he was the first human witness to an underwater crime in progress.

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Noah Oppenheim

John Patriquin / Staff Photographer

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University of Maine graduate student Noah Oppenheim of Falmouth sets up his underwater camera during an experiment that revealed cannibalization among lobsters off Pemaquid Point.

Photo courtesy of Noah Oppenheim

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AIRING IT OUT

Tune in to NewsRadio 560 WGAN at 8:08 a.m. Friday to hear columnist Bill Nemitz talk about this column and other issues.

"I was blown away," Oppenheim, 25, said during a break this week at The American Lobster in a Changing Ecosystem, a four-day symposium of marine scientists at the Holiday Inn by the Bay in Portland. "I had no idea this was coming -- absolutely no idea."

He's talking about lobsters eating their young.

At night, when nobody's looking.

Or so they thought.

We hear a lot these days about Maine's brain drain, that excruciating exodus of our best and brightest young people from their home state to, well, anywhere but Maine.

Then along comes a young scientist-in-training like Oppenheim and suddenly the future doesn't feel quite so bleak.

He grew up in Falmouth, graduated from Waynflete School in Portland in 2005 and spent seven years attending college and working on the West Coast. Now he's enrolled in a dual master's program -- in marine biology and fisheries policy -- at the University of Maine.

And on Wednesday, Oppenheim took a deep breath and delivered his first-ever presentation at a scientific conference. His topic: "Cannibals by night? Density-dependent feeding in the Gulf of Maine's lobster population."

(Think Tru-TV's "Top 20 Most Shocking" videos -- only with claws.)

"It's my honor to be this much in the loop," Oppenheim said as more than 100 scientists from New England and Canada, including his own mentors from UMaine, milled about the conference organized by the university's Maine Sea Grant College Program.

"Noah fits my lab perfectly," said Rick Wahle, a professor in UMaine's School of Marine Sciences who is Oppenheim's adviser. "He's got a great heart and is very enthusiastic about his work."

Which brings us back to the lobsters.

Back in the summer of 2009, just before his senior year at Reed College in Portland, Ore., Oppenheim landed a National Science Foundation "Research Experience for Undergraduates" grant through the Bigelow Laboratory for Ocean Sciences in East Boothbay.

Through Wahle, who worked at Bigelow at the time, he'd become acquainted with research on predators of juvenile lobsters -- mostly cod, other groundfish and the occasional crab -- done by UMaine Professor Robert Steneck in the 1980s.

Back in those days, there was no shortage of ocean dwellers that considered juvenile lobsters the perfect appetizer. But as speaker after speaker at this week's conference noted, the groundfish off Maine's coast are long gone and thus the lobsters, with no more "top-down" predators to keep them on the run, are everywhere.

"So this begs the question: How have top-down trophic dynamics of juvenile lobsters changed since these previous assessments?" Oppenheim asked his standing-room-only audience.

Translation: Who down there, if anyone, is still scarfing down the baby lobsters?

Donning their scuba gear, Oppenheim and Wahle dived in off Pemaquid Point and set up their 30-foot-deep observation platform: an infrared, underwater camera mounted on a four-legged platform over a window screen resting on the bottom. Secured to the screen was an 8-inch tether with a small harness on the end. Into the harness Oppenheim placed a juvenile lobster -- prevented by the tether from going beyond the camera's narrow range.

"We were hoping just to see that maybe they were being untouched or that perhaps there were still fish and maybe there was just a different predator assemblage," explained Oppenheim.

Translation: He expected hours of boring video. So boring that as he watched what was going on from the boat above that first night, Oppenheim eventually fell asleep.

(Continued on page 2)

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