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Population Growth: Understanding Logistic and Exponential Models, Schemes and Mind Maps of Evolutionary biology

University of Maryland Eastern ShoreEvolutionary biology

An overview of population growth, comparing and contrasting logistic and exponential models. It identifies examples of populations demonstrating different types of growth and discusses factors affecting population growth and their impact on population size. Learn about carrying capacity, limiting factors, and their effects on population density.

Typology: Schemes and Mind Maps

2021/2022

Uploaded on 09/27/2022

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astarloa 🇺🇸

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Populations
Learning Targets:
1. Compare and contrast logistic and exponential growth
models.
2. Identify examples of populations that demonstrate different
types of population growth.
3. Identify factors that affect population growth.
4. Predict the effects of limiting factors (ex. carrying capacity)
on population growth.
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Download Population Growth: Understanding Logistic and Exponential Models and more Schemes and Mind Maps Evolutionary biology in PDF only on Docsity!

Populations

Learning Targets:

  1. Compare and contrast logistic and exponential growth models.
  2. Identify examples of populations that demonstrate different types of population growth.
  3. Identify factors that affect population growth.
  4. Predict the effects of limiting factors (ex. carrying capacity) on population growth.

What is a population?

  • Population : a group of organisms that are the same species and live in the same area. - Healthy populations should grow and die at a relatively steady rate. - Unless the population runs out of water, food, space, or is attacked by disease or a predator, it will continue to grow.

What is growth rate?

  • Populations of organisms do not experience linear growth.
  • Usually show a J-curve growth.

Time

# organisms Time

# organisms

What are the two types of population growth?

Exponential Growth : occurs under ideal conditions with unlimited resources when a population is able to reproduce exponentially. Each generation will be larger than the generation before

Logistic Growth : Occurs when a population’s growth slows and then stops, following a period of exponential growth. Population reaches carrying capacity

What affects the number of individuals in a population?

  • Carrying Capacity : number of organisms of one species that an environment can support. - If a population overshoots the carrying capacity, limiting factors take effect.

What affects the number of individuals in a population?

Limiting Factors : restricts the existence,

reproduction, or distribution of organisms

(slows population growth).

  • Abiotic : sunlight, climate, temperature, water, fire, soil chemistry, etc.
  • Biotic : predators, food availability
  • Limiting factors often affect the dispersal of individuals.

How does density affect populations?

Population Density : refers to the number of individuals per unit area.

Population Density

  • Population Density : the number of individuals in a given area. Density-Dependent Limiting Factors Density-Independent Limiting Factors DEFINITION As the population size increases, the: greater the effect of the factor.

DEFINITION Affect population size: regardless of population size and dispersal. EXAMPLES disease, competition, predators, parasites, and: food

EXAMPLES Temperature, storms, flood, drought, pesticides,: habitat destruction.

Distribution : refers to how individuals in a population are spaced