A blade of grass grows in a beleaguered estuary
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Submerged aquatic vegetation or SAV is vital for the health of the Chesapeake Bay. The grasses are nurseries for young fish. They hide crabs after they've molted their shell. They are a food source for waterfowl and aquatic organisms including zooplankton, which are themselves a vital component of the food chain. They even help control sediment and absorb excess nutrients from the water.
So news that the Chesapeake Bay has more SAV -- about 12,000 acres more since 2007, according to a recently released survey -- is welcome. It represents an increase of 18 percent in a relatively short period of time.
Just how significant is this? And why are grasses in certain areas rebounding while other portions of the bay are continuing to lose them? That, unfortunately, is not altogether clear, although it's tempting to assume that efforts to lessen the flow of nitrogen and phosphorus into the water might be having some helpful effect.
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