Maryland Public Television (MPT) will celebrate the nation’s largest estuary with a week of Chesapeake Bay-related programming, to begin on Sunday, April 21.
Image courtesy Maryland Sea Grant
During Chesapeake Bay Week, a dozen programs will explore some of the most pressing issues facing the watershed, from the future of the agriculture and seafood industries to the health of iconic critters and waterways. An hour-long special called “Who Killed Crassostrea virginica?” will take a look at the demise of the Bay’s native oyster, while a 30-minute program called “The Last Boat Out” will follow a family of Virginia watermen as they question staying in the business of seafood harvesting.
Bay history, too, will be part of the annual event: “Black Captains of the Chesapeake” will highlight African Americans who have captained on the Bay, while “Growing Up on Tilghman” will explore what it was like to grow up in this quiet watermen’s community on Maryland’s Eastern Shore.
“There is really rich content within these shows,” said Betsy Peisach, MPT’s managing director for education marketing and outreach. Peisach encourages teachers, in particular, to bring these programs into their classrooms where possible. And for those who teach middle-school science, MPT has developed an online interactive that allows students to explore the Bay, whether it is through a virtual tour of the Bay’s varied ecosystems or an online cinema that features clips from Outdoors Maryland.
MPT will wrap up Chesapeake Bay Week with a concert and volunteer-a-thon to connect viewers with volunteer opportunities across the watershed.
The Chesapeake Bay Program is a sponsor of Chesapeake Bay Week this year. Learn more.
According to the results of a survey conducted by the Maryland Department of Natural Resources (DNR), oyster abundance has increased in state waters for the second consecutive year and more of the bivalves are withstanding pressures from pollution and disease.
The 2012 Fall Oyster Survey, which has monitored the status of the state’s oyster population since 1939, found a 93 percent oyster survival rate—the highest since 1985—and a lower-than-average prevalence of MSX and dermo, two diseases that have decimated the Chesapeake Bay’s native oysters in recent decades.
In a news release, DNR Fisheries Service Director Tom O’Connell attributed these successes to the establishment of oyster sanctuaries, which are closed to harvest and which could allow oysters to build up a natural disease resistance.
Maryland is currently restoring oyster reefs in the Harris Creek and Little Choptank River sanctuaries, as part of a federally mandated effort to restore oyster populations in 20 Bay tributaries by 2025.
Read more about the 2012 Fall Oyster Survey results.
More than half of the nation’s river and stream miles are in poor health, according to a new study from the U.S. Environmental Protection Agency (EPA).
The latest National Rivers and Streams Assessment, a sampling effort conducted during the summers of 2008 and 2009, found that 55 percent of the nation’s rivers and streams are in poor condition and 23 percent are in fair condition, their health impaired by nutrient pollution, a loss of streamside vegetation and bacterial and chemical contaminants.
These same stressors have impacted the Chesapeake Bay and its tidal waters. Excess nutrients can fuel the growth of algae blooms that suck oxygen from the water, creating “dead zones” within which animals cannot survive. A loss of streamside vegetation can boost erosion and push sand, soil and sediment into waterways, blocking sunlight from reaching underwater grasses and smothering the habitat that some aquatic organisms need to live or breed. And chemical contaminants—like, for instance, mercury—can accumulate in the tissues of fish, leading to fish consumption advisories in polluted waterways.
But rivers and streams are critical to the health of humans and wildlife alike, as sources of drinking water, food and habitat. According to the EPA, this survey suggests the need to better address pollution at its source, whether it is urban, suburban or agricultural runoff or the treatment of wastewater.
Owning and maintaining waterfront property can be an expensive commitment. Residents across the Chesapeake Bay watershed must contend with shoreline erosion and rising sea level, while adapting to environmental regulations that protect water quality. One strategy for tackling all of these issues has gained increasing popularity: living shorelines that not only protect human property, but also utilize and even enhance the Bay’s unique natural habitat.
Scott Hardaway and Karen Duhring are marine scientists and living shoreline experts at the Virginia Institute of Marine Science (VIMS), which sits at the mouth of the York River in Gloucester Point, Va.
Scott Hardaway began working for VIMS in 1979, and is now the director of the Shoreline Studies Program. He is a leading authority on the design and implementation of “headland breakwaters,” a living shoreline technique that creates protected “pocket beaches” like those constructed at VIMS in 2010.
Headland breakwater systems are built using large stone structures called “headlands,” which sit offshore and disrupt the incoming waves that can cause shoreline erosion. Mathematical formulas determine the necessary angle, shape and placement of each headland. Wider gaps between breakwaters create long, narrow pocket beaches, while narrow gaps create wide, circular beaches.
Their wave-blocking action creates a calm, shallow lagoon between the breakwaters, which are connected to shore by a sandbar called a “tombolo.”
Additional sand must be brought in to form the tombolo and stabilize the beach. This raises the cost of these projects, but is critical to the final phase of construction: planting native beach and dune vegetation.
Karen Duhring is an educator and researcher at the VIMS Center for Coastal Resources Management (CCRM), where she helps manage and monitor living shoreline projects.
According to Duhring, on-shore plantings serve key ecological functions that enhance the effectiveness of living shorelines. On sandy beaches, plant roots stabilize loose material and improve water quality, as they filter pollutants from upland runoff.
Living shorelines use native plants—smooth and saltmeadow cordgrass here in the Bay—that have adapted to thrive and reproduce in a specific environment. Once established, cordgrass recruits naturally along the beach, dispersing seeds and rhizomes that spread horizontally beneath the sand to establish new plants in empty areas.
Beach plantings are susceptible to damage from foot traffic, so precautions should be taken to prevent the trampling of plants. Access restrictions allowed for more expensive plantings on the VIMS western shore, while heavy use from research activities limited plantings on the other.
During high tides, organic material washes onto the beach and provides nutrients for the growing plants, which in turn provide habitat and food for native wildlife.
Headland breakwaters themselves also provide habitat for crabs, mollusks and other aquatic species that thrive on underwater reefs. Along the VIMS shoreline, oysters have settled on the granite rocks to form the beginnings of a complex reef community.
According to Hardaway, headland breakwaters are not always the perfect solution for every sandy shoreline. Whenever possible, existing habitat for submerged aquatic vegetation and shellfish should remain undisturbed. While the costly structures do come with some tradeoffs, they also offer invaluable protection for human infrastructure. The once-vulnerable VIMS shoreline, for instance, has withstood Hurricanes Irene and Sandy—thanks to its headland breakwaters.
As the living shorelines at VIMS demonstrate, projects such as these—which successfully address the needs of both humans and nature—are critical to Bay restoration. Through the work of experts like Hardaway and Duhring, these living shorelines continue to serve both practical and educational purposes, teaching the public how we can responsibly manage our natural resources today in order to preserve them long into the future.
View full-resolution photos on the Chesapeake Bay Program Flickr page.