What are four ways to determining population size?

Answer 1

Sampling - counting the number of organisms in a small area and multiplying to estimate the number in a larger area

Mark & Recapture - capture an organism & release it to remix with population. Then recapture some more in that area to determine population size. Formula is as follows: R (marked recaptures) / C (total in second sample) = M (marked initially) / N (total pop. size)

Indirect Observation - estimating the population size by tracks, nest or other animal signs in an ecosystem.

Direct Observation - count all members of a population in an ecosystem

Answer 2

Four ways to determine population size include conducting a census, using statistical sampling methods, employing satellite imagery and remote sensing, and analyzing demographic data. Each method has its own advantages and limitations depending on the population size and distribution.