. Classification of wetlands and deepwater habitats of the United States. Wetlands -- United States; Wetland ecology -- United States; Aquatic ecology -- United States. U UPLAND PALUSTRINE UPLAND PALUSTRINE UPLAND PALUSTRINE UPLAND Seepage Zone. a TEMPORARILY FLOODED b SEASONALLY FLOODED c SEMIPERMANENTLY FLOODED d INTERMITTENTLY EXPOSED e PERMANENTLY FLOODED f SATURATED â HIGH WATER VERAGE WATER LOW WATER Fig. 6. Distinguishing features and examples of habitats in the Palustrine System. assigned to the class Scrub-Shrub. When trees and shrubs cover less than 30% of the area but the total cove
. Classification of wetlands and deepwater habitats of the United States. Wetlands -- United States; Wetland ecology -- United States; Aquatic ecology -- United States. U UPLAND PALUSTRINE UPLAND PALUSTRINE UPLAND PALUSTRINE UPLAND Seepage Zone. a TEMPORARILY FLOODED b SEASONALLY FLOODED c SEMIPERMANENTLY FLOODED d INTERMITTENTLY EXPOSED e PERMANENTLY FLOODED f SATURATED â HIGH WATER VERAGE WATER LOW WATER Fig. 6. Distinguishing features and examples of habitats in the Palustrine System. assigned to the class Scrub-Shrub. When trees and shrubs cover less than 30% of the area but the total cover of vegetation (except pioneer species) is 30% or greater, the wetland is assigned to the appropriate class for the predominant life form below the shrub layer. Finer differences in life forms are recognized at the subclass level. For example, Forested Wetland is divided into the subclasses Broad-leaved Deciduous, Needle-leaved Deciduous, Broad-leaved Evergreen, Needle-leaved Evergreen, and Dead. Subclasses are named on the basis of the predominant life form. If vegetation covers less than 30% of the substrate, the physiography and composition of the substrate are the principal characteristics used to distinguish classes. The nature of the substrate reflects regional and local variations in geology and the influence of wind, waves, and currents on erosion and deposition of substrate materials. Bottoms, Shores, and Stream- beds are separated on the basis of duration of inun- dation. In the Riverine, Lacustrine, and Palustrine systems, Bottoms are submerged all or most of the time, whereas Streambeds and Shores are exposed all or most of the time. In the Marine and Estuarine systems, Bottoms are subtidal, whereas Streambeds and Shores are intertidal. Bottoms, Shores, and Streambeds are further divided at the class level on the basis of the important characteristic of rock versus unconsolidated substrate. Subclasses are based on finer distinctions in substrate material unless, a
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