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Classification
Scientific Name: Temperate Pacific Freshwater Mudflat
Unique Identifier: CES200.878
Classification Confidence: 2 - Moderate

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Summary: Freshwater mudflats are found scattered throughout the temperate regions of the Pacific Coast of North America. In the Pacific Northwest, they occur primarily in seasonally flooded shallow lakebeds on floodplains, especially along the lower Columbia River. During any one year, they may be absent because of year-to-year variation in river water levels. Mudflats must be exposed before the vegetation develops from the seedbank. They are dominated mainly by low-stature annual plants. They range in physiognomy from sparsely vegetated mud to extensive sods of herbaceous vegetation. The predominant species include Eleocharis obtusa, Lilaeopsis occidentalis, Crassula aquatica, Limosella aquatica, Gnaphalium palustre, Eragrostis hypnoides, and Ludwigia palustris.

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)

Classification Comments: Revised to eliminate overlap with North Pacific Intertidal Freshwater Wetland (CES204.875) and to better clarify the type, with input from John Christy.

Component Associations
Association Unique ID Association Name
CEGL003324 Bidens cernua Mudflat
CEGL003326 Eleocharis obtusa Mudflat
CEGL003327 Eragrostis hypnoides - Gnaphalium palustre Mudflat
CEGL003328 Euthamia occidentalis Mudflat
CEGL003330 Ludwigia palustris - Polygonum hydropiperoides Aquatic Vegetation
CEGL003331 Myriophyllum hippuroides Aquatic Vegetation



Classifiers

Land Cover Class: Barren
Spatial Pattern: Small 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
Extensive Wet Flat  

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
%
Crassula aquatica G5 Flowering forb Herb (field)  
 
 
Gnaphalium palustre G5 Flowering forb Herb (field)  
 
 
Lilaeopsis occidentalis G4 Flowering forb Herb (field)    
 
 
Limosella aquatica G5 Flowering forb Herb (field)  
 
 
Ludwigia palustris G5 Flowering forb Herb (field)    
 
 
Persicaria hydropiperoides G5 Flowering forb Herb (field)    
 
 
Eleocharis obtusa G5 Graminoid Herb (field)    
 
 
Eragrostis hypnoides G5 Graminoid Herb (field)  
 
 


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: AK, CA, OR, WA
Global Range: This system is found throughout the temperate regions of the Pacific Coast of North America.

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

The Nature Conservancy's Conservation Ecoregions
Code Name Occurrence Status
14 California North Coast Confident or certain
15 California Central Coast Confident or certain
16 California South Coast Confident or certain
2 Puget Trough - Willamette Valley - Georgia Basin Confident or certain

MRLC 2000 Mapzones
Code Name Occurrence Status
1 Northern Cascades Confident or certain
2 Oregon Coastal Range Predicted or probable
3 Northern California Coastal Range Confident or certain
4 Southern California Coastal Range Confident or certain
7 Cascade Mountain Range Confident or certain
8 Grande Coulee Basin of the Columbia Plateau Confident or certain
9 Blue Mountain Region Confident or certain

National Mapping
ESLF Code (Ecological System Lifeform): 3122

West Landfire Legend: No
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 07Feb2005
Element Description Author(s): C. Chappell

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


References
  • Chappell, C., and J. Christy. 2004. Willamette Valley-Puget Trough-Georgia Basin Ecoregion Terrestrial Ecological System EO Specs and EO Rank Specs. Appendix 11 in: J. Floberg, M. Goering, G. Wilhere, C. MacDonald, C. Chappell, C. Rumsey, Z. Ferdana, A. Holt, P. Skidmore, T. Horsman, E. Alverson, C. Tanner, M. Bryer, P. Lachetti, A. Harcombe, B. McDonald, T. Cook, M. Summers, and D. Rolph. Willamette Valley-Puget Trough-Georgia Basin Ecoregional Assessment, Volume One: Report prepared by The Nature Conservancy with support from The Nature Conservancy of Canada, Washington Department of Fish and Wildlife, Washington Department of Natural Resources (Natural Heritage and Nearshore Habitat programs), Oregon State Natural Heritage Information Center and the British Columbia Conservation Data Centre.

  • 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.

  • 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