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Wyoming Natural Diversity Database

State Trend

This category is a measure of the trends in populations of plant species of concern within Wyoming and has two sub-categories: Historical Trend and Recent Trend.  Usually, Historical Trends are not known and quantitative information.  Recent trend is a measure of the decline or increase in numbers of occurrences or extent over recent decades (starting about 1970 unless otherwise stated).  Current numbers and occupied habitat are not known for most species, and pre-1970 values are wanting, so trend rank is based largely on current distribution pattern and inferred habitat change over this area.  Short-term cyclic population fluxes should not be included in this ranking, but rather might be included under the intrinsic vulnerability rank.  Potential and projected trends are addressed under threats. 

A = Large decline:  Decrease of over the majority of total numbers or in total occupied area.
B = Moderate decline:  Decrease of less than the majority of total numbers or in total occupied area.
C = Stable:  Species has likely not declined in total numbers or occupied range.
D = Increase:  Species has increased in total numbers or occupied range.
U = Unknown:  There is insufficient data to estimate a trend in either direction.


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Wyoming Natural Diversity Database

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Department 3381

Laramie, WY 82071

Phone: 307-766-3023

Fax: 307-766-3026

Email: wyndd@uwyo.edu

1000 E. University Ave. Laramie, WY 82071
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