1 / 6

Lesson Overview

Learn about the different types of limiting factors that control the growth of a population, including density-dependent and density-independent factors. Discover how stress from overcrowding and external factors like weather can impact population dynamics. Explore examples such as competition, predation, disease, and natural disasters.

smackie
Download Presentation

Lesson Overview

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. Lesson Overview 5.2 Limits to Growth

  2. Limiting Factors • A limiting factor is a factor that controls the growth of a population. • May be density dependent or independent.

  3. Density-Dependent Limiting Factors • Density-dependent limiting factors include competition, predation,herbivory, parasitism, disease, and stress from overcrowding. • small, scattered populations are not affected as much

  4. Stress From Overcrowding • overcrowdedSTRESS • stress weakens the body’s immune system • In some species, stress from overcrowding can cause females to neglect, kill, or even eat their own offspring. • Stress from overcrowding can lower birthrates, raise death rates, or both, and can also increase rates of emigration.

  5. Density-Independent Limiting Factors • Density-independent limiting factors affect all populations, regardless of population size and density. • Ex: weather- hurricanes, droughts, or floods, and natural disasters such as wildfires

  6. True Density Independence? • Isle Royale- the moose population grew exponentially for a time after the wolf population crashed. • bitterly cold winter- moose decreased • island population-no emigration or immigration • effects of bad weather on the large, dense population were greater than they would have been on a small population.

More Related