Maritime Dune Scrub
The shrublands of this group occupy somewhat protected maritime back dunes and leeward dune slopes, generally along the inland edges of dune systems in zones sheltered from constant ocean salt spray. Maritime Dune Scrub occurs along the Atlantic coast of the United States from New Jersey south to Florida. The vegetation is characterized by several tree, shrub and dwarf shrub species. Dominant scrubby species include northern bayberry (Myrica pensylvanica), live oak (Quercus virginiana, southeastern Virginia only), persimmon (Diospyros virginiana), and black cherry (Prunus serotina var. serotina). On the northern seacoast of Virginia, high-tide bush (Baccharis halimifolia) is also sometimes characteristic. Many woody species are significantly stunted in this habitat and, like the live oak, are often much broader than tall. Few herbaceous species are present under the shrub canopy, but occasional gaps support most of the species found in the dune grasslands.
On some high, remnant dunes and areas of dune blowouts, the dwarf shrub sand-heather (Hudsonia tomentosa) forms an assemblage with seaside goldenrod (Solidago sempervirens var. sempervirens), bitter seabeach grass (Panicum amarum ssp. amarum), Gray's flatsedge (Cyperus grayi), and beach pinweed (Lechea maritimavar. virginica). This community type, present on Assateague Island, Parramore Island, and the southeastern Virginia coast, often occurs in a mosaic with maritime dune woodlands. Maritime shrublands are threatened by coastal development and by natural and anthropogenic disturbances that destroy the protective primary dune system.References: Clovis (1968), The Nature Conservancy (1997).
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Low, mounded live oaks (Quercus virginiana) are the characteristic woody species of maritime dune scrub on False Cape, City of Virginia Beach (False Cape State Park). Photo: Gary P. Fleming.
|Northern bayberry (Myrica pensylvanica) and beach panic grass (Panicum amarum ssp. amarulum) dominate dune scrub at False Cape State Park, City of Virginia Beach. Photo: Tom Rawinski / © DCR Natural Heritage.|
|Dense northern bayberry (Myrica pensylvanica) scrub with scattered, wind-pruned black cherry (Prunus serotina var. serotina) trees at the southern tip of the Eastern Shore in Northampton County (Fisherman's Island National Wildlife Refuge). Photo: Irvine Wilson / © DCR Natural Heritage.|
|Dwarf shrubland of sand-heather (Hudsonia tomentosa) on a back dune blow-out at Picketts Harbor in Northampton County. A tall, dense shrubland dominated by northern bayberry (Myrica pensylvanica) occupies the stabilized dune in the background. Photo: Tom Rawinski / © DCR Natural Heritage.|
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