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.
