Posted by Kristen Goodhue on August 12th, 2014
by Kristen Minogue
A ghost pot pulled out of Chesapeake Bay. (Michael Reid/Southern Maryland Newspapers)
Every year, thousands of crab pots disappear, their lines snapped by violent storms or severed by the propellers of passing boats. Cut off from the buoys that once marked their presence, they become “ghost pots,” lost at the bottom of the Chesapeake.
But ghost pots aren’t dead pots. They’re still quite capable of trapping crabs, including mature females undergoing their spawning migration. And with no one to retrieve them, crabs too large to escape are condemned to a slow death by starvation. This often has the eerie effect of luring even more animals to their demise, says Laura Patrick, aquatic ecologist at the Smithsonian Environmental Research Center (SERC).
“The crabs are just going in and they’re dying,” Patrick says. “And one of the problems is that the dead animals that are in there can be bait for new crabs to come in. So it’s kind of a self-baiting pot.”
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Posted in Ecology, Fisheries | Comments Off on Banishing the Ghosts on the Bay Floor
Posted by Kristen Goodhue on August 8th, 2014
by Sarah Hansen
Julie Sepanik holds up a large male blue crab caught in the Rhode River. (SERC)
No one disputes that blue crab numbers in Chesapeake Bay are low. There is much discussion, however, about what to do to fix the problem. Smithsonian Environmental Research Center intern Julie Sepanik is working with SERC postdoctoral fellow Matt Ogburn to develop a computer model that will help improve our understanding of blue crab population dynamics in the Bay. The model works to identify where female crabs mature in the Bay and track their migration to lower Bay spawning areas. Ultimately, they hope the model will help inform decisions about preserving habitat and restoring the population.
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Posted in Ecology, Fisheries, Interns | Comments Off on Virtual crabs could help real recovery
Posted by Kristen Goodhue on July 29th, 2014
By Sarah Hansen
“Who’s been seining before?” asks SERC education intern Anna Youngk (right).
“Hurry, hurry, hurry! Baby pipefish!” camper Jack Yee, 11, squeals as he trundles across the beach in much-too-big waders with hands cupped. A moment later the startled fish, caught by campers in a seine net, is swimming safely in a plastic tub already populated with silversides, glass shrimp, and one large pickerel.
Orion Ford, 10 (left), and Jack Yee, 11, are ready to dissect a perch.
Jack’s energy and concern for the creatures of Chesapeake Bay are exactly what SERC summer day camps are all about. The programs range from “Pollywogs” camp for prekindergarten students to this week’s offering, “Environmental Detectives” camp for rising fifth- and sixth-graders. Led by Education Department interns Anna Youngk, Lizzie DeRycke and Eric Glass, each week 12 children experience activities related to the Bay, its inhabitants, and what they can do to help. Click to continue »
Posted in Publications | Comments Off on SERC camps cultivate environmentally-conscious kids
Posted by Kristen Goodhue on July 25th, 2014
By Sarah Hansen
Keryn Gedan collects mussels and oysters “by the handful” for her research. (Chris Judy)
Oyster restoration has long been championed as key to cleaning up Chesapeake Bay, because oysters’ filter-feeding lifestyle improves water quality by removing plankton. But oysters aren’t the only ones that can do the job. A new study reports that another bivalve, the hooked mussel, also removes its share of plankton from the clogged Bay. Click to continue »
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Posted by Kristen Goodhue on July 24th, 2014
By Sarah Hansen
Experimental chambers and blowers give the marsh a spooky feel on this cloudy morning at SERC.
At first encounter, the marsh looks as if it came out of a Heinlein novel. Boxy white robots dot the wetland, igloo-shaped encampments litter the landscape, and thick black tubes snake across the mud—wait, did that one just move? On closer inspection, clusters of human beings appear crouched in the sedge, carefully taking measurements for the annual Global Change Research Wetland (GCREW) Summer Marshfest.
“These two weeks are the most important two weeks of the year for us,” said Smithsonian Environmental Research Center biogeochemist Patrick Megonigal. During Marshfest, senior scientists, postdocs, volunteer citizen scientists, interns, lab techs and visiting students all join forces to collect data for three experiments focused on climate change and nutrient cycling, all managed by Megonigal. Click to continue »
Posted in Climate Change, Ecology, SERC Sites and Scenes | Comments Off on Summer “Marshfest” gets all hands on deck
Posted by Kristen Goodhue on July 24th, 2014
by Kristen Minogue
Male blue crabs can mate with multiple females. But with fewer men to go around, their female partners are left with less sperm to reproduce. (SERC)
The practice of selectively fishing male blue crabs in the Chesapeake—intended to give females a chance to reproduce—may have a hidden cost. A Bay without enough males could reduce the number of offspring females produce, ecologists at the Smithsonian Environmental Research Center found in a paper published in the July issue of Marine Ecology Progress Series.
Maryland and Virginia began reducing the harvest of female crabs by commercial and recreational watermen in 2008, the year officials declared the blue crab fishery a federal disaster. Since then, the crabs have shown signs of a shaky recovery. But a lasting comeback hinges on females producing enough offspring to sustain the population.
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Posted in Ecology, Fisheries, Publications | Comments Off on Blue Crabs Need (More Than) A Few Good Men
Posted by Kristen Goodhue on July 21st, 2014
by Dejeanne Doublet
SERC intern Dejeanne Doublet heads out to sample marsh elder.
(Megan Palmer)
As we’re knee-deep in the marsh surrounding the Chesapeake Bay, working under the relentless sun during 90-degree weather with 90 percent humidity, sweat dripping down our faces, waving off the summer bugs and trying to collect as much field data as possible, the idea of winter becomes abstract and far-fetched. It’s hard to believe we are out here in the blazing heat of summer studying the effects of this past winter— one of harshest winters this area has endured in many years.
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Posted in Climate Change, Ecology, Extreme Weather, Interns, SERC Sites and Scenes | Comments Off on Intern Logs: A Summer Quest
to Understand Winter
Posted by Kristen Goodhue on July 17th, 2014
By Sarah Hansen
SERC intern Bridget Smith, immersed in a sea of environmental data. (SERC)
Underwater plants like sea grasses provide habitat and feeding areas for a wide range of aquatic life. They also help filter the water and put the brakes on erosion. But in Chesapeake Bay, the coverage of underwater plants, or submerged aquatic vegetation (SAV), has been low for decades, and restoration attempts have had mixed results. That’s why this summer, Smithsonian Environmental Research Center intern Bridget Smith is grappling with 28 years of data to explore which of a host of factors affects SAV in the Bay and how.
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Posted in Ecology, Interns, Land Use, SERC Sites and Scenes, Water Quality | Comments Off on Using Computer Models to Help Rescue Bay’s Underwater Flora
Posted by Kristen Goodhue on July 9th, 2014
By Sarah Hansen
A cluster of downy rattlesnake plantain, the orchid species SERC intern Christopher Robinson is studying this summer. (Wikimedia Commons user Cdc25A)
Orchids are beautiful plants to be treasured, and fungi are gross moldy blobs to avoid at any cost. At least, that’s what some people may think. But it turns out that no orchid can germinate and grow without a fungal partner. Smithsonian Environmental Research Center scientist Melissa McCormick has been learning about the relationship between orchids and fungi for 15 years. This summer, though, intern Christopher Robinson is helping put a new twist on the research. Click to continue »
Posted in Ecology, Interns | Comments Off on Orchid, Fungi and Bacteria Relationships:
“It’s Complicated”
Posted by Kristen Goodhue on July 8th, 2014
By Sarah Hansen
James Biddle, SERC intern, twists a soil augur into the ground to collect a 50- to 100-centimeter deep soil core.
It’s well-known that carbon dioxide levels are rising in Earth’s atmosphere and that extra CO2 contributes to climate change. You might also have learned that trees are “carbon sinks” – they take carbon out of the air and store it in their trunks, roots and leaves. But what about carbon in forest soil?
If you’re not sure, you’re in good company. “We’re just learning how carbon moves through the forest at the surface, and that’s the most accessible part of the forest,” said Sean McMahon, senior scientist at the Smithsonian Environmental Research Center (SERC). “Below ground is much more of a mystery.” Click to continue »
Posted in Climate Change, Ecology, Interns | Comments Off on Getting to the core of carbon in forest soils
