Crabs caught in a research trap are pulled from the briny waters of Little Bay into bright sunshine on the afternoon of Monday, Aug. 10. Researchers are tracking the arrival of new species of crabs in New Hampshire's waters, where climate change is contributing to shifts in important ecosystems. (Photo by Molly Rains/New Hampshire Bulletin)Lobsters have long reigned as king among New England’s shelled sea creatures, but the chances of a coup are…