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ACFORAbundant Common Frequent Occasional Rare (species rating scale in ecology)
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AcFor the [continental] US, the viewing will be best in the west,Ac said Gordon Johnston, program executive and lunar blogger at Nasa.
Relative abundances from more recent published and unpublished reports were calculated by stream or stream reach and were categorized using the Abundance, Common, Frequent, Occasional, Rare (ACFOR) scale per stream or stream reach: abundant (>75% in relative abundance), common (50-75%), frequent (25-49%), occasional (5-24%), and rare (1-4%) (Kent and Coker, 1992; Stiers et al, 2011).