Practical field tool

DAFOR: A Practical Abundance Scale

By Mark D’Cruz, developed from his Applied Permaculture Diploma research and Academy teaching

DAFOR is a quick ecological field scale for comparing relative abundance within a defined survey area.

Collection
Design Tools
Reading time
4 minutes
First published
15 August 2026
Last reviewed
15 August 2026
An illustrated DAFOR field guide defining Dominant, Abundant, Frequent, Occasional and Rare, with a repeatable survey method, example and common mistakes.
DAFOR is an ordinal field estimate for relative abundance within a defined area, not an exact population count. The written definitions, method, example and limitations below provide the complete text equivalent. Open full-size infographic.

What DAFOR means

Dominant
The species strongly dominates the area being recorded.
Abundant
Present in large numbers or cover, but not dominant.
Frequent
Found repeatedly across the area.
Occasional
Present in several places but not encountered regularly.
Rare
Found only in very small numbers or at very few points.

DAFOR is an ordinal field estimate. Define the survey area and apply the categories consistently; it is not an exact population count.

A first-use method

  1. Define the habitat or survey area before assigning categories.
  2. Choose a repeatable route or sample pattern and record date, weather and observer.
  3. Identify species only to the level your evidence supports.
  4. Assign one DAFOR category using the same judgement throughout the survey.
  5. Record uncertainty, patchiness and any part of the area that was inaccessible.
  6. Repeat with the same method when comparison over time matters.

Field-recording example

RecordExample
AreaDefined woodland-edge transect
SpeciesCork oak
DAFOR categoryFrequent
Evidence noteEncountered in most sections, with uneven age classes
Design questionDoes regeneration differ with browsing, shade or soil disturbance?

Common mistakes and limits

  • Changing the meaning of categories during a survey.
  • Comparing differently sized or defined areas as though they were equivalent.
  • Using DAFOR where a count, cover estimate or specialist survey is required.
  • Treating abundance as proof of ecological benefit or harm.
  • Hiding uncertain identification behind a confident category.

At Vila Pinheiro, Mark used DAFOR conventionally for flora and experimented with adapting the scale to compare renewable-energy resource availability. That second use is an Academy interpretation, not the standard ecological method.

Printable DAFOR field sheet

Purpose and defined area: _______________________________________

Date, method, weather and observer: _____________________________

Species or featureD/A/F/O/RLocation and evidence noteConfidence or follow-up
 
 
 
 
 
 
 
 

Sources and provenance

  1. The Heritage Council, Best Practice Guidance for Habitat Survey and Mapping.
  2. Mark D’Cruz, Design 7 DAFOR flora appendix within the Diploma journey.