91制片厂

91制片厂 researchers have scientifically documented the first discovery of a pair of recently mated blue crabs in Great Bay Estuary (GBE) 鈥� the official confirmation that conditions in the Bay this year have become hospitable for the species that is typically found farther south. The presence of a breeding population is expected to have serious impacts on the Great Bay ecosystem, although the extent of those impacts is still unknown.

It was a routine late summer day on the estuary checking the traps that had been set out by 91制片厂 doctoral candidate Kelsey Meyer to monitor the estuary鈥檚 invasive green crab population, when doctoral candidate Alyssa Stasse and technician Emily Williams found a big surprise in one of the traps: two blue crabs that appeared to have mated. The female, which had recently molted, was subsequently examined and found to have distended turgid seminal receptacles with large sperm plugs, clear evidence of crustacean copulation.

Blue crabs have been captured occasionally in GBE since 2012, according to Jason Goldstein 鈥�12G, research director at the , but this is the first time researchers have found compelling evidence that the crabs are actually mating 鈥� and it鈥檚 a pretty big deal. It means a species that once only found itself in the colder, less hospitable waters of GBE by accident, has now found the Bay鈥檚 waters 鈥攚arming as the result of climate change 鈥� a welcome habitat. Their arrival also heralds significant and potentially devastating implications for the estuary鈥檚 ecosystem, particularly its fragile oyster population.

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� says , professor and chair of the department of biological sciences. Meyer, Stasse and Williams work in Brown鈥檚 .

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

鈥�05G, fisheries and aquaculture specialist for and , agrees.

"It's exciting from the scientific perspective, but not exciting from the perspective of 'Here's a new species that shouldn't be here.'"

鈥淚f [the blue crabs] are here long enough to eat and molt and mate, they may be setting up shop,鈥� she says. 鈥淚t鈥檚 exciting from the scientific perspective, but not exciting from the perspective of 鈥楬ere鈥檚 a new species that shouldn鈥檛 be here.鈥欌��

Bradt is leading a new 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. The team includes 鈥�04G, 鈥�19G, coastal ecosytems specialist at 91制片厂 Cooperative Extension and New Hampshire Sea Grant, Chris Peter 鈥�07G, research coordinator at the Great Bay National Estuarine Research Reserve (GBNERR), Heather Ballestero, research assistant at GBNERR, and Jessie Batchelder, research assistant at Manomet.

Oysters and the oyster farming industry in GBE are already threatened by invasive green crabs, which also feed on bivalves. Meyer, whose traps caught the two mating blue crabs, is studying the abundance, distribution and diet of green crabs in GBE. She is currently 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.

Brown and her team have submitted the scientific finding of the mated blue crabs to , a journal that documents natural history of organisms in northeastern North America.

The research projects that both Meyer and Stasse are conducting are funded primarily by a New Hampshire Agricultural Experiment Station Hatch grant, with additional funding from 2022 New Hampshire Sea Grant Graduate Research Fellowships.

听

听

听

听