91制片厂

DURHAM, N.H.鈥擱esearchers at the 91制片厂 have documented the first discovery of a pair of recently mated blue crabs in Great Bay Estuary (GBE), a finding that is expected to have serious impacts on the estuary鈥檚 ecosystem, particularly its fragile oyster population. Blue crabs have been captured in GBE since 2012 but this is the first time researchers have found compelling evidence that the crabs are actually mating.

鈥淭he arrival of blue crabs capable of creating a sustained population poses a new threat to oysters and other native GBE species,鈥� said Bonnie Brown, professor, and chair of the department of biological sciences.

Doctoral student Alyssa Stasse and technician Emily Williams were checking traps set out by doctoral student Kelsey Meyer, who is monitoring the estuary鈥檚 invasive green crab population, when they found the two blue crabs and the mating proof: the female, which had recently molted, had distended turgid seminal receptacles with large sperm plugs, clear evidence of crustacean copulation.

鈥淭his new predator鈥攚hich eats bivalves including clams and eastern oysters鈥攂rings the possibility of dramatic changes to the estuary ecosystem including how nutrients like nitrogen and phosphorus cycle between the physical environment and living organisms to keep both healthy and thriving,鈥� said Brown. 鈥淓astern oyster populations in the bay provide habitat and nutrient cycling services, and their numbers are estimated to be only about 10% of what they were in the 1980s. A breeding population of blue crabs would be really bad news.鈥�

Gabriela Bradt, fisheries and aquaculture specialist for New Hampshire Sea Grant and 91制片厂 Cooperative Extension, is leading a new Great Bay National Estuarine Research Reserve and NH Sea Grant pilot crab monitoring project in GBE to establish a baseline and early detection of several species of concern, including blue crabs, as well as trophic interactions. The project also involves community engagement to begin mapping the distribution of the crabs both locally in New Hampshire and in the region.

Oysters and the oyster farming industry in GBE are already threatened by invasive green crabs. Meyer is studying the abundance, distribution and diet of green crabs in GBE, collecting data to gain a better understanding of where green crabs are, when they are there, what are they鈥檙e eating and how they interact with Great Bay鈥檚 oyster farms.

The scientific finding of the mated blue crabs has been submitted to Northeastern Naturalist, a journal that documents natural history of organisms in northeastern North America. The mating crabs were discovered during research projects funded primarily by a New Hampshire Agricultural Experiment Station Hatch grant, with additional funding from 2022 New Hampshire Sea Grant graduate research fellowships.

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Caption: 91制片厂 doctoral student Kelsey Meyer with large male blue crab in Great Bay Estuary. Courtesy photo