DE_LE_1.3.1

DE_LE_1.3.1_What Are the Factors of Population Demographics?

LS2.A Interdependent Relationships in Ecosystems
LS2.C Ecosystem Dynamics, Functioning, and Resilience

By NickBeth Meyer

1. Why are Animal Populations in Decline?
2. Does this apply to all animals (or are there some populations that are increasing?
3. Do we see similar declines in plant populations?

Multiple Select

Population Demographics provides information about...

• population size

• density

• distribution

• how you voted

Population Density = # of individuals/area

​G = rN
G is population's growth
r is the rate of increase or decrease (due to factors such as the average # of offspring, the average life span, the age at which organisms reproduce, and survival of young) *can be + or -
N is the current population size

Open Ended

Greenfield's population as of 2025 was 21,138 people. Greenfield occupies an area of 2.93 mi².

What is the population density of Greenfield, CA?

Direct vs. Indirect

How do you count a population?