YOU NEED A CALCULATOR!!!!!Start-Up: What is the biological level smaller than a community? How is it defined?

Characteristics of Populations

Population – group of individuals of a single species that live in the

same general area – rely on the same resources & face similar

challenges

Population size = total number of individuals

Population density= number per unit area

Sampling Techniques to Estimate Population Density & Size

1. Quadrats

2. Indirect Counting

3. Mark-recapture method

Total population = (# in first capture)(# in second capture) # of marked animals recaptured