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Classification
Scientific Name: North Pacific Maritime Eelgrass Bed
Unique Identifier: CES200.882
Classification Confidence: 1 - Strong

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Summary: Eelgrass beds are found throughout the coastal areas of the North Pacific Coast, from southern Oregon (Coos Bay) north into the Gulf of Alaska, Cook Inlet, and Bristol Bay coasts. Intertidal zones are found with clear water in bays, inlets and lagoons, typically dominated by macrophytic algae and marine aquatic angiosperms along the temperate Pacific Coast. Subtidal portions are never exposed while intertidal areas support species that can tolerate exposure to the air. Common substrates include marine silts, but may also include exposed bedrock and cobble, where many algal species become attached with holdfasts. Subtidal/lower intertidal in clear water. Substrate is usually marine silts, but may be cobble. Beds are dominated by Zostera marina.

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)



Classifiers

Land Cover Class: Herbaceous Wetland
Spatial Pattern: Large patch
Natural/Seminatural: No
Vegetated ( > 10% vascular cover):
Upland: No
Wetland: Yes
Isolated Wetland: No

Diagnostic Classifiers
Primary Classifier Secondary Classifier
Herbaceous  
Temperate Temperate Oceanic
Aquatic Herb  

Non-diagnostic Classifiers
Primary Classifier Secondary Classifier
Lowland Lowland

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Char-
acter-
istic
Domi-nant Con-stant
Cover Class %
Con-
stancy
%
Phyllospadix scouleri G5 Aquatic herb Submerged aquatic    
 
 
Zostera marina G5 Aquatic herb Submerged aquatic    
 
 


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: AK, OR, WA
Nation: Canada
Canadian Province Distribution: BC
Global Range: This system is found throughout the coastal areas of the North Pacific Coast, from southern Oregon (Coos Bay) north into the Gulf of Alaska, Cook Inlet, and Bristol Bay coasts.

Biogeographic Divisions
Division Code and Name Primary Occurrence Status
204-North American Pacific Maritime C: Confident or certain

The Nature Conservancy's Conservation Ecoregions
Code Name Occurrence Status
1 Pacific Northwest Coast Confident or certain
2 Puget Trough - Willamette Valley - Georgia Basin Confident or certain
69 S.E. Alaska - B.C. Coastal Forest and Mountains Confident or certain
70 Gulf of Alaska Mountains and Fjordlands Confident or certain
71 Cook Inlet Basin Confident or certain
74 Bristol Bay Basin Confident or certain

MRLC 2000 Mapzones
Code Name Occurrence Status
1 Northern Cascades Confident or certain
2 Oregon Coastal Range Confident or certain
75 Cook Inlet Confident or certain
76 Southwest Alaska Confident or certain
77 Prince William Confident or certain
78 Southeast Alaska Confident or certain

National Mapping
ESLF Code (Ecological System Lifeform): 9230
ESP Code (Environmental Site Potential): 1670
EVT Code (Existing Vegetation Type): 2670

West Landfire Legend: Yes
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 06Mar2003
Element Description Author(s): P. Comer, G. Kittel, K. Boggs

Ecological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).


References
  • Boggs, K. 2002. Terrestrial ecological systems for the Cook Inlet, Bristol Bay, and Alaska Peninsula ecoregions. The Nature Conservancy, Anchorage, AK.

  • Comer, P., D. Faber-Langendoen, R. Evans, S. Gawler, C. Josse, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, M. Russo, K. Schulz, K. Snow, J. Teague, and R. White. 2003-present. Ecological systems of the United States: A working classification of U.S. terrestrial systems. NatureServe, Arlington, VA.

  • Holland, V. L., and D. J. Keil. 1995. California vegetation. Kendall/Hunt Publishing Company, Dubuque, IA. 516 pp.

  • Viereck, L. A., C. T. Dyrness, A. R. Batten, and K. J. Wenzlick. 1992. The Alaska vegetation classification. General Technical Report PNW-GTR286. USDA Forest Service, Pacific Northwest Research Station, Portland, OR. 278 pp.

  • WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.


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Data last updated: March 2019