1 / 10

Chapter 5 Section 1 How Populations Grow

Chapter 5 Section 1 How Populations Grow. Objectives: -List the characteristics used to describe a population -Identify factors that affect population size -Differentiate between exponential and logistic growth

gyula
Download Presentation

Chapter 5 Section 1 How Populations Grow

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 5 Section 1How Populations Grow Objectives: -List the characteristics used to describe a population -Identify factors that affect population size -Differentiate between exponential and logistic growth AZ Science Standard: Assess how the size of and the rate of growth of a population are determined by birth and death rate, immigration, emigration, and carrying capacity of the environment.

  2. Characteristics used to describe populations: Geographic Distribution: Population Density: Number of individuals per unit area Population density = Number of individuals Unit area • The area inhabited by a population • Described as Squared km

  3. Population Density Continued • Suppose there are 150 bullfrogs living in a pond that covers an area of 3 square kilometers. What is the density of the bullfrog population? • Pop. Density = 150 bullfrogs = 50 bullfrogs/km2 3 km2

  4. Population Growth: • Factors that affect population size: • Number of births • Number of deaths • Number of individuals that enter or leave the population (immigration and emigration)

  5. Population Growth: • Immigration – the movement of individuals into an area • Emigration – the movement of individuals out of an area

  6. Population Growth Exponential Growth: Under ideal conditions with unlimited resources, a population will grow exponentially J-Shape curve • Growth pattern in which the individuals in a population reproduce at a constant rate

  7. Exponential Growth

  8. Population Growth Logistic Growth: S-shape curve • Growth pattern in which a population’s growth rate slows or stops following a period of exponential growth

  9. Logistic Growth (S-shaped curve) • Carrying Capacity- largest number of individuals of a population that a given environment can support • Determined by: Food, nutrients, space, water, etc.

  10. Carrying capacity # Number of Yeast cells Time (hours)

More Related