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The Middle Atlantic coastal forests are a temperate coniferous forest mixed with patches of evergreen broadleaved forests (closer to the Atlantic coast) along the coast of the southeastern United States.

Setting
The Middle Atlantic coastal forests stretch along the Southern Atlantic coast of the United States from extreme Southern New Jersey south to the Georgia coast. They cover the lower Atlantic coastal plain and are bordered on the west by the Southeastern mixed forests.

The habitats of the ecoregion are constantly altered through different environmental phases. The bottomlands, coastal plains, and maritime areas are vulnerable to tropical cyclones and floods. The drier areas with soils that contain more gaps between sediment particles are susceptible to fires and drought. Fire return intervals of 1 to 3 years favor herbaceous plants; longer intervals favor dense shrubs, to broadleaved evergreen trees.

Climate
This ecoregion has a humid subtropical climate with hot summers and mild winters, and with the heaviest precipitation concentrated in the summer.

Flora
Within Middle Atlantic coastal forests two subtypes of forest habitats can be found. One of these subtypes is the Southern mixed forest which contains generic broadleaf trees including pine, hickory, and oak. The second type of forest can be found closer to the Atlantic coastline in the southernmost areas in coastal South Carolina and coastal Georgia. Such areas contain isolated patches of evergreen broadleaved forests and "hammocks".

The mixed pine-oak forests occur on dry or sandy soils or in areas exposed to occasional fires. Longleaf pine (Pinus palustris), superbly adapted to fire-prone environments, was the principal tree in many of these forests; however, extensive logging and human development have reduced this trees occurrence to less than 5% of its former range. Loblolly pine (Pinus taeda) and shortleaf pine (Pinus echinata) grow in sandy soils and are still dominant in this ecosystem. The floor of these forests are home to various grasses such as bluestem, panicums, and longleaf uniola, which aid in the natural fire processes of these woodland areas. Other trees found in the area include hardwoods such as turkey oak (Quercus laevis), post oak (Quercus stellata), myrtle oak (Quercus myrtifolia), Spanish oak (Quercus falcata), and southern catalpa (Catalpa bignonioides).

Evergreen forest occur close to the coast in localized areas as either evergreen Maritime oak forests or as more localized evergreen hammocks(geographically induced forest islands) (Box 1985). These forests consist of evergreen broadleaved canopy trees, such as Magnolia grandiflora, Magnolia virginiana, Persea borbonia, Gordonia lasianthus, Sabal, and several evergreen oaks such as Quercus myrtifolia, and the iconic Quercus virginiana or southern Live Oak often covered with Spanish moss (Tillandsia usneoides). The understory is also often evergreen in these forests, with Myrica cerifera and Osmanthus americanus very common, while several evergreen species of Ericaceae, Ilex, and scrub palms (Sabal minor and Serenoa) are common on more moist sites. In the open areas near sandy beaches and coastal areas, large endemic populations of Yucca and cactus (Opuntia) thrive in the hot sun and sandy soils.

The Middle Atlantic coastal forests contain the most diverse assemblage of freshwater wetland communities in North America. These include freshwater marshes, shrub bogs, white cedar swamps, bayheads, and wet hammocks.

The bottomland hardwood forests for which the ecoregion is famous are dominated by bald cypress (Taxodium distichum) and swamp tupelo (Nyssa sylvatica var. biflora).

Bald cypress swamps are often dominated by their namesake tree, and are too wet for foot travel. Many uncommon orchids grow among the baldcypress branches.

Swamp tupelo, along with water tupelo (Nyssa aquatica), dominate mixed-hardwood swamp forests. These grow aside water-adapted oaks that include water oak (Quercus nigra), swamp chestnut oak (Quercus michauxii), cherrybark oak (Quercus pagoda), willow oak (Quercus phellos), and overcup oak (Quercus lyrata). Swamp hickory (Carya glabra) and water hickory (Carya aquatica) are also found here. Pawpaw (Asimina triloba) grows in the understory.

Atlantic white cedar (Chamaecyparis thyoides) swamps occur along blackwater rivers.

Pocosins are flat and damp, sandy, or peaty areas far from streams. They have scattered pond pine (Pinus serotina) and a dense growth of mostly evergreen shrubs including gallberry (Ilex glabra).

Barrier islands along the coast protect extensive estuaries, lagoons, and sounds.

Carolina bays are a unique habitat of the ecoregion.

Fauna
The nine-banded armadillo (Dasypus novemcinctus) is a distinctive animal that lives in this ecoregion. The Virginia opossum (Didelphis virginiana) is abundant.

The mixed pine-oak forests ecosystems are extremely diverse when it comes to types of species. The most common species found throughout the ecosystem are the Whitetail dear and the cottontail rabbit. Squirrels are another species that thrive in the deciduous trees. The fox and grey squirrels are the main inhabitants particularly in the upland regions. The brown-headed nuthatch (Sitta pusilla) feeds on pine seeds. The yellow-throated warbler (Dendroica dominica) is widely distributed. The northern parula (Parula americana) and the eastern bluebird (Sialia sialis) are also found here. The Bachman's sparrow (Aimophila aestivalis) and red-cockaded woodpecker (Picoides borealis), both uncommon, also live in this ecoregion.

As the sea level elevation gets lower there becomes a change in topography and species alike. In the bottomland forests one can find a vast assortment of reptiles due to the availability of boles, branch cavities, and rotting logs. Snake species become especially abundant in the lowland area due to the change in habitat. Copperheads (Agkistrodon contortrix), rat snakes (Pantherophis alleghaniensis), and speckled kingsnakes (Lampropeltis holbrooki) are just a few examples of snakes species that inhabit the forest floor. In the extreme southeast regions (coastal southeast North Carolina south to Georgia) the large American alligator (Alligator mississippiensis) can be found along tidal inlets and marsh areas.

Contemporary land use
Unfortunately, very little of this ecoregion remains unaltered from human development. The main reason that these habitats have been altered is from agriculture, fire suppression, urbanization, coastal development, ditching and draining of wetlands, and damming of rivers.

The western part of the ecoregion has been most altered. There, the upland vegetation has been nearly completely converted. While the upland region has been altered the most, the biggest threat is to the wetlands and bottomland forests due to their extreme ecological importance. These ecosystems provide support to other communities through protection from storms and high energy production.

Long-leaf pine savannas have nearly disappeared.

The least altered habitats in the ecoregion are the coastal marshes and deep peatlands.

Remaining intact habitat

 * Francis Marion National Forest (SC)
 * Pine Barrens (NJ)
 * Holly Shelter Gamelands (NC)
 * Croatan National Forest (NC)
 * Congaree National Park (SC)
 * Outer Banks (NC)
 * Pamlimarle Peninsula (NC)
 * Prime Hook National Wildlife Refuge (DE)
 * Roanoke River (VA)
 * Sandhills Gameland (NC)
 * Sandhill National Wildlife Refuge (SC)
 * Great Dismal Swamp (VA and NC)
 * Great Cypress Swamp (DE and MD)
 * Assateague Island (MD and VA)
 * Virginia Coast Reserve (VA)
 * Cape Romain (SC)
 * Fort Bragg (NC)
 * Fort Jackson (SC)
 * Fort Stewart (GA)
 * Cape May National Wildlife Refuge (NJ)