What is an EO Rank?
An EO rank represents the relative value of an EO with respect to others for that Element, defined according to criteria derived from specific EO rank factors. An EO rank provides an assessment of the estimated viability or probability of persistence of the occurrence. EO ranks are used in prioritizing EO’s for conservation planning purposes. The different ranks that can be assigned to an EO are as follows: A – Excellent predicted viability B – Good predicted viability C – Fair predicted viability D – Probably not viable E – Verified extant F – Failed to find H – Historical X – Extirpated (blank) – Unranked The basic “A” through “D” ranks are based on current known factors that are used to predict the viability of an EO. The more viable an EO is, the higher its EO rank and the higher its conservation value. The cut-off for viability occurs at the “C” rank, with “D” ranked EO’s characterized as probably not viable.
