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Cothurnia limnoriae - NSCEP | US EPA - US Environmental ...

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Ecosystems<br />

Table 4: Definitions for the ecosystem categories. Ecosystems are broad ecosystem types located within the regimes.<br />

Major Habitat Type:<br />

Level 1<br />

Ecosystem Class:<br />

Level 2<br />

Ecosystem Class:<br />

Level 3<br />

Ecosystem Class:<br />

Level 4<br />

Definition<br />

Unconsolidated<br />

Ecosystems<br />

Ecosystem types associated with sediment.<br />

Unvegetated<br />

Sediment environments where plants or algae do not<br />

Sediment<br />

dominate. Exposed sediment.<br />

Coastal Shore<br />

Sediment environments along the coast that are affected by<br />

the tides and water activity (shore waves). i.e. sandy beaches<br />

Clastic Sediments A sediment environment (beach) composed of rock fragments.<br />

A sediment environment (beach) composed of calcium<br />

Carbonate Sediment carbonate, including shells, calcified algae, and coral<br />

skeletons.<br />

Tide Flats<br />

Relatively flat, sediment areas that are submerged or exposed<br />

by the changing tides. Includes mud flats.<br />

Sediment environments that are composed of shrimp burrows.<br />

Burrowing Shrimp These environments are usually dominated by one species of<br />

shrimp (e.g., Neotrypaea sp.).<br />

Clastic Sediments<br />

A tidal flat where the sediment is composed of rock<br />

fragments.<br />

A tidal flat where the sediment is composed of calcium<br />

Carbonate Sediment carbonate. Sources include shells, calcified algae, and coral<br />

skeletons.<br />

Subtidal<br />

Sediment that is covered by a body of water at all times,<br />

without exposure to air due to tides.<br />

Clastic Sediments<br />

Sandy subtidal where the sediment is composed of rock<br />

fragments.<br />

Sandy subtidal where the sediment is composed of calcium<br />

Carbonate Sediment carbonate. Sources include shells, calcified algae, and coral<br />

skeletons.<br />

Submerged Aquatic<br />

Sediment environments that include and are dominated by<br />

Vegetation (SAV)<br />

aquatic plants that are covered by water, i.e. seagrasses.<br />

Zostera SAV environments dominated by the seagrass Zostera.<br />

Zostera marina<br />

SAV environments dominated by the seagrass Zostera<br />

marina. Z. marina is native to the Northeast Pacific (NEP).<br />

57

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