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The following information is provided courtesy of the
USDA National
Resources Conservation Service.
|
Code |
Wetland Type |
Comment |
|
OBL |
Obligate Wetland |
Occurs almost always (estimated probability 99%)
under natural conditions in wetlands. |
|
FACW |
Facultative Wetland |
Usually occurs in wetlands (estimated probability
67%-99%), but occasionally found in non-wetlands. |
|
FAC |
Facultative |
Equally likely to occur in wetlands or non-wetlands
(estimated probability 34%-66%). |
|
FACU |
Facultative Upland |
Usually occurs in non-wetlands (estimated
probability 67%-99%), but occasionally found on wetlands (estimated
probability 1%-33%). |
|
UPL |
Obligate Upland |
Occurs in wetlands in another region, but occurs
almost always (estimated probability 99%) under natural conditions in
non-wetlands in the regions specified. If a species does not occur in
wetlands in any region, it is not on the National List. |
|
NA |
No agreement |
The regional panel was not able to reach a
unanimous decision on this species. |
|
NI |
No indicator |
Insufficient information was available to determine
an indicator status. |
|
NO |
No occurrence |
The species does not occur in that region. |
National Indicators reflect the range of estimated probabilities (expressed
as a frequency of occurrence) of a species occurring in wetlands versus
non-wetland across the entire distribution of the species. A frequency, for
example, of 67%-99% (Facultative Wetland) means that 67%-99% of sample plots
containing the species randomly selected across the range of the species would
be wetland. When two indicators are given, they reflect the range from the
lowest to the highest frequency of occurrence in wetlands across the regions in
which the species is found. A positive (+) or negative (-) sign was used with
the Facultative Indicator categories to more specifically define the regional
frequency of occurrence in wetlands. The positive sign indicates a frequency
toward the higher end of the category (more frequently found in wetlands), and a
negative sign indicates a frequency toward the lower end of the category (less
frequently found in wetlands). A question mark (?) following a National
Indicator denotes a tentative assignment based on the botanical literature and
not confirmed by regional review.
Regional Indicators express the estimated probability (likelihood) of a species
occurring in wetlands versus non-wetlands in the region. Regional Indicators
reflect the unanimous agreement of the Regional Interagency Review Panel. An
asterisk (*) following a regional Indicator identifies tentative assignments
based on limited information from which to determine the indicator status.
The wetland indicator categories should not be equated to degrees of wetness.
Many obligate wetland species occur in permanently or semi-permanently flooded
wetlands, but a number of obligates also occur in and some are restricted to
wetlands which are only temporarily or seasonally flooded. The facultative
upland species include a diverse collection of plants, which range from weedy
species adapted to exist in a number of environmentally stressful or disturbed
sites (including wetlands), to species in which a portion of the gene pool (an
ecotype) always occurs in wetlands. Both the weedy and ecotype representatives
of the facultative upland category occur in seasonally and semi-permanently
flooded wetlands.
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