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Classification
Scientific Name: North Pacific Intertidal Freshwater Wetland
Unique Identifier: CES204.875
Classification Confidence: 2 - Moderate

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Summary: This ecological system occurs throughout the coastal margin and intertidal zone of the Pacific Northwest Coast of Oregon, Washington and north into British Columbia. It may occur in Alaska, but has not been described from there. Intertidal freshwater wetlands occur as narrow strips to more extensive patches along tidally influenced portions of rivers. There has been little vegetation data collection of this type in this region; a few studies indicate dominant species include Picea sitchensis, Alnus rubra, Cornus sericea, Myriophyllum hippuroides, Typha angustifolia, Athyrium filix-femina, and Carex lyngbyei. This system is driven by daily tidal flooding of freshwater and associated soil saturation. Vegetation structure and composition are varied and depend on substrate characteristics and the tidal flooding regime of particular sites. Where small areas of mudflat occur in tidally influenced freshwater areas, they are included in this intertidal freshwater wetland and not in Temperate Pacific Freshwater Mudflat (CES200.878).

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)

Classification Comments: It's unclear if this system occurs in Alaska; it was not identified in recent systems classification work.

Component Associations
Association Unique ID Association Name
CEGL000055 Picea sitchensis / Cornus sericea / Lysichiton americanus Swamp Forest
CEGL000400 Picea sitchensis / Rubus spectabilis / Carex obnupta - Lysichiton americanus Swamp Forest
CEGL003292 Cornus sericea - Salix (hookeriana, sitchensis) Shrub Swamp
CEGL003324 Bidens cernua Mudflat
CEGL003329 Lilaeopsis occidentalis Mudflat
CEGL003331 Myriophyllum hippuroides Aquatic Vegetation
CEGL003369 Carex lyngbyei Salt Marsh
CEGL003389 Alnus rubra / Rubus spectabilis / Carex obnupta - Lysichiton americanus Riparian Forest
CEGL003406 Populus balsamifera ssp. trichocarpa - Acer macrophyllum / Equisetum hyemale Riparian Forest
CEGL003408 Populus balsamifera ssp. trichocarpa / Cornus sericea / Impatiens capensis Riparian Forest



Classifiers

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

Non-diagnostic Classifiers
Primary Classifier Secondary Classifier
Herbaceous  

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Char-
acter-
istic
Domi-nant Con-stant
Cover Class %
Con-
stancy
%
Picea sitchensis G5 Needle-leaved tree Tree canopy    
 
 
Alnus rubra G5 Broad-leaved deciduous tree Shrub/sapling (tall & short)    
 
 
Cornus sericea G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Salix hookeriana G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Salix sitchensis G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Lysichiton americanus G5 Flowering forb Herb (field)    
 
 
Athyrium filix-femina G5 Fern (Spore-bearing forb) Herb (field)    
 
 
Carex lyngbyei G5 Graminoid Herb (field)    
 
 
Carex obnupta G5 Graminoid Herb (field)    
 
 
Typha angustifolia G5 Graminoid Herb (field)    
 
 
Myriophyllum hippuroides G5 Aquatic herb Submerged aquatic  
 
 


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: OR, WA
Nation: Canada
Canadian Province Distribution: BC
Global Range: This system occurs throughout the coastal margin and intertidal zone of the Pacific Northwest coast of Oregon, Washington and north into British Columbia. It may occur in Alaska but has not been described from there.

Biogeographic Divisions
Division Code and Name Primary Occurrence Status
105-Montane Boreal N: Never was there
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
69 S.E. Alaska - B.C. Coastal Forest and Mountains Confident or certain

MRLC 2000 Mapzones
Code Name Occurrence Status
1 Northern Cascades Confident or certain
2 Oregon Coastal Range Confident or certain

National Mapping
ESLF Code (Ecological System Lifeform): 9220

West Landfire Legend: No
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 08Dec2008
Element Description Author(s): C. Chappell, G. Kittel, M.S. Reid

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. 2000. Classification of community types, successional sequences and landscapes of the Copper River Delta, Alaska. General Technical Report PNW-GTR-469. USDA Forest Service, Pacific Northwest Research Station, Portland, OR. March 2000. 244 pp.

  • 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.

  • Kunze, L. M. 1994. Preliminary classification of native, low elevation, freshwater wetland vegetation in western Washington. Washington State Department of Natural Resources, Natural Heritage Program. 120 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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