Print Report
CEGL005452 Lemna spp. North American Boreal Aquatic Vegetation
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Duckweed species North America Boreal Aquatic Vegetation
Colloquial Name: North America Boreal Duckweed Pond
Hierarchy Level: Association
Type Concept: This aquatic association of floating vegetation is tentatively proposed for boreal regions of North America. Lemna spp. typically dominate but may be mixed with other plant taxa floating on the water surface. Lemna-dominated aquatic vegetation occupies wetlands that are permanently, semipermanently or seasonally flooded. These small plants may float on the water''s surface or become stranded and possibly rooted during drawdown periods. Water chemistry is fresh. The standing water habitat is relatively shallow, generally less than 2-4 m (6.6-13.1 feet) and occurs as ponds, lakes, ditches, stock ponds, and backwater sloughs of river and stream channels. Standing water for much or most of the growing season is characteristic. Depth of the water is of no consequence to floating plants; they occur where the wind pushes them. The composition of examples varies across this wide distributional range. Lemna taxa that may be present in the boreal and subarctic regions of North America include Lemna trisulca (widespread temperate and boreal, but not southeast U.S.) and Lemna turionifera (widespread temperate and boreal, but not southeast U.S.).
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: This Lemna association is tentatively recognized as distinct from other Lemna spp. associations (CEGL005450 and CEGL005451) based on the very limited diversity of Lemna in this region. However, better documentation of this association is needed before it can be removed from provisional status.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: The composition of examples varies across the wide distributional range of this community. Lemna taxa that may be present in the boreal and subarctic regions of North America include Lemna trisulca (widespread temperate and boreal, but not southeast U.S.) and Lemna turionifera (widespread temperate and boreal, but not southeast U.S.).
Dynamics: Because the biomass of floating organisms is generally not great, they do not have an important influence on the accumulation of organic matter on the pond bottom.
Environmental Description: Lemna-dominated aquatic vegetation occupies wetlands that are permanently flooded, semi-permanently flooded to seasonally flooded. Water chemistry is fresh. The standing water habitat is relatively shallow, generally less than 2-4 m (6.6-13.1 feet) and occurs as ponds, lakes, ditches, stock ponds, and backwater sloughs of river and stream channels. Standing water for much or most of the growing season is characteristic. Depth of the water is of no consequence to floating plants; they occur where the wind pushes them. Community composition may change hour to hour, yet the environment, only the top few centimeters of water, is homogeneous. Biomass can be abundant under eutrophic conditions.
Geographic Range: This type may occur in the boreal and subarctic regions of the United States and Canada.
Nations: CA,US
States/Provinces: AB, AK, BC, MB, NT, NU, ON, QC, SK, YT
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.894270
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: GNR
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 5 Aquatic Vegetation Class | C05 | 5 |
| Subclass | 5.B Freshwater Aquatic Vegetation Subclass | S13 | 5.B |
| Formation | 5.B.2 Temperate to Polar Freshwater Aquatic Vegetation Formation | F057 | 5.B.2 |
| Division | 5.B.2.Na North American Freshwater Aquatic Vegetation Division | D049 | 5.B.2.Na |
| Macrogroup | 5.B.2.Na.3 Common Mare''s-tail - Mixed Boreal Aquatic Vegetation Macrogroup | M871 | 5.B.2.Na.3 |
| Group | 5.B.2.Na.3.a North American Boreal Freshwater Aquatic Vegetation Group | G769 | 5.B.2.Na.3.a |
| Alliance | A4253 Duckweed species - Mixed Boreal Floating Aquatic Vegetation Alliance | A4253 | 5.B.2.Na.3.a |
| Association | CEGL005452 Duckweed species North America Boreal Aquatic Vegetation | CEGL005452 | 5.B.2.Na.3.a |
Concept Lineage: CEGL003059 split by region into CEGL005450, CEGL005451, CEGL005452 (DFL 7-13).
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: No Data Available
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.