Beneath the Hudson River, the graceful sway of seagrass meadows serves as a vital signifier of the waterway’s well-being. However, these submerged fields have diminished by over 40% in the last twenty years, as highlighted by recent findings from the New York State Department of Environmental Conservation.
Scientists, tracking the decline of submerged aquatic vegetation since 1997, note similar trends in the Long Island Sound and along the Jersey Shore. The proliferation of seagrass, essential for nourishing birds and providing sanctuary for juvenile fish, faces threats from human pollution and extreme weather, jeopardizing the fragile underwater ecosystem.
George Jackman, Riverkeeper’s habitat restoration manager, underscores the significance of these underwater habitats, likening them to forests that shelter a diverse array of creatures.
In the shallower waters of the Hudson River, water celery and various pondweeds dominate, nurturing larval and juvenile fish such as alewife, perch, and carp. These verdant fields also offer refuge to minnows, shad, and blueback herring, shielding them from predators.
The dwindling seagrass populations have repercussions beyond fish populations. Bay scallops, closely intertwined with seagrass survival, have become increasingly scarce in regions like New Jersey’s Barnegat Bay and Long Island’s bays, according to Rutgers University ecology professor Richard Lathrop.
Waterfowl, including ducks and wading birds like snowy egrets and great blue herons, rely on seagrass as both habitat and sustenance.
Experts attribute the decline in seagrass to factors such as frequent and intense storms, which disrupt water clarity by increasing sediment and nutrient levels. Pollution, stemming from sewage discharges, septic tank leakage, and agricultural runoff, compounds the issue, while boat propellers exacerbate damage to seagrass beds.
Conservation efforts are underway, albeit in nascent stages. Experimental methods, such as transplanting grass from healthier habitats, are being explored, though with varying success. The state Department of Environmental Conservation plans to rear seagrass in greenhouses for subsequent planting in the Hudson River, aiming to mitigate the decline.
As the agency prepares to release an updated map of the river’s submerged aquatic vegetation, experts anticipate a clearer understanding of the extent of the decline, underscoring the urgency of concerted conservation efforts.