Factors to be considered to select a method to be used.

1. Size of the organism e.g. big organisms such elephants are easily counted directly
2. Mode of the organism such as

• motility; plants and sessile or slow-moving organism may be counted directly, while indirect methods may be required for fast- moving organism in large open grass land.
• Association between organism- some methods such as capture – recapture method requires organism that associate randomly.
• Hostility hostile organism may require special gadgets for collection and/or counting.

3. Size of the area under investigation. For big area, population may be estimated basing on samples

4. Physical and climatic factors

5. Climatic condition

6. Topography

7.Nature of vegetation

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Dr. Bbosa Science