Parent Layer: Biological Habitat

Name: Eelgrass Meadows

Display Field: state

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Eelgrass (Zostera marina) meadows are critical wetlands components of shallow coastal ecosystems throughout the region. Eelgrass meadows provide food and cover for a great variety of commercially and recreationally important fauna and their prey. Eelgrass and other seagrasses are often referred to as "Submerged Aquatic Vegetation" or SAV. This distinguishes them from algae, which are not classified as "plants" by biologists (rather they are often placed in the kingdom protista), and distinguishes them from the "emergent" saltwater plants found in salt marshes. In addition to the term SAV, some coastal managers use the term SRV or submerged rooted vegetation. The Eelgrass Meadows layer was created from several separate datasets for the states of Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, and New York. Where possible, polygon datasets depicting the most recent eelgrass surveys were used. Attributes with common themes for each dataset were integrated in order to better represent eelgrass density and year sampled. The data user is encouraged to read this and the metadata of each individual state’s data carefully, as geometry, attribute details, and timeliness are not necessarily consistent among datasets used to develop this layer. Details of each state’s data source are described in the data processing section of the metadata. Note that the eelgrass distribution data is presence-only. Because surveys of eelgrass do not encompass all coastal waters, absence of eelgrass in a particular place on the map does not necessarily mean that eelgrass does not live at that location.

Definition Expression: N/A

Copyright Text: This data was compiled by the Northeast Ocean Data Portal using datasets from the Maine Departments of Marine Resources and Environmental Protection, University of New Hampshire, New Hampshire Department of Environmental Services, Piscataqua Region Estuary Partnership, NH GRANIT (New Hampshire Geographically Referenced Analysis and Information Transfer System), Massachusetts Department of Environmental Protection, Massachusetts Division of Marine Fisheries, MassGIS, Rhode Island Eelgrass Task Force, RIGIS, Connecticut Department of Energy and Environmental Protection, Peconic Estuary Partnership, and New York Natural Heritage Program, New York State Department of Environmental Conservation

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Spatial Reference: 102100  (3857)

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