1. CHANGES IN POPULATION SIZE Population can change in size when new members join the population or when members leave the population. BIRTH RATE: The number of births in a population in a certain amount of time. DEATH RATE: The number of deaths in a population in a certain amount of time.

2. Population Size

3. CHANGES IN POPULATION SIZE If birth rate > death rate = If death rate > birth rate = Population increases Population decreases If death rate = birth rate = Population Stays the same

4. POPULATION DENSITY - The number of individuals in a specific area. What is the formula to calculate population density? Population Density = Number of individuals _____________ Unit Area

5. Calculate the population density of flamingos. Population Density 10 flamingos ___________ 8 square meters =1.25Flamingos/ square meter =

6. Calculate the population density of flamingos. Population Density = 20 flamingos ___________ 8 square meters =2.5Flamingos/ Square meter

7. Immigration & Emigration Latin root: “Migrare” means “to move” What do you think the prefixes mean?? Im- “in” E- “out” Why might a population move in or out of a habitat??

8. The largest population an area can support is called its ____________. carrying capacity The carrying capacity of a population is determined by limiting factors. Limiting factor: An environmental factor that causes a population to decrease. foodwaterspaceweather conditions