Measuring populations

MEASURING POPULATIONSBY: Durh, Hutr, Pars

Direct observation Counting each organism in a population.Ex: We counted all the tomato plants in the

garden.

Indirect Observation Counting the signs of the population.Ex: We counted all of the prairie dog holes.

SamplingCounting the number in a small area then

estimating the big area.Ex: We counted how many fish were in a

small part of the pond then estimated the number in the whole pond.

Mark-and-recaptureCapturing a few of one species marking

them then come back and see how many are marked there

Ex: We captured a few birds marked them then waited for more to come back and counted the ones with marks.