1. POPULATIONS

2. POPULATION POPULATION SIZE
Group of one species living in the same place, at the same time, and can interbreed
POPULATION SIZE
# of individuals in a population.
Smaller populations have a greater chance of extinction
Large populations can be wiped out by natural disasters

3. POPULATION DENSITY Number of individuals that live in a given area.
DISPERSION
The way the individuals are arranged in space.
3 types- random, even, and clumped

4. KILLER WHALE POPULATION

5. SCHOOL OF ATLANTIC SPADEFISH

6. GROWTH RATE
When more individuals are born the population increases, when more die it decreases

7. BIOTIC FACTORS All living organisms that inhabit an environment
Ex: fish, humans, trees

8. ABIOTIC FACTORS Non living parts of the environment
Ex: air currents, temp, soil, water

9. TYPES OF POPULATION GROWTH
Exponential Growth- occurs when there are no limits to the size to which a population can grow
Resources are unlimited, small population
Represented by the J-Curve

10. Carrying Capacity- maximum # of organisms that a population can have.
Factors limiting the carrying capacity are food, water, space, disease, predators.
Represented by the S- Curve
carrying capacity

12. Boom & Crash- population experiences exponential growth followed by crashes

13. K- strategists- slow growing, small populations, don’t reproduce quickly
R- strategists- short life span, large populations, reproduce a lot.

14. Density Dependent Factors- has an increasing effect as the population increases
Ex: food, water, disease
Density Independent Factors- affect all populations regardless of density
Usually caused by environmental conditions- temp, storms, floods, drought, fire

15. Limiting Factors
Any abiotic/biotic factor that restricts the existence of an organism.
Water, food, sunlight etc..
Tolerance- the ability to withstand fluctuations in abiotic/biotic conditions