1 / 16

Do now

Do now. Describe the ecosystem of Easter Island. What are some factors that limited how many people can live on Easter Island?. Do Now. What are three factors that might limit the growth of a population of lions on the savannah?. Carrying capacity.

tamara-dillon
Télécharger la présentation

Do now

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. Do now • Describe the ecosystem of Easter Island. • What are some factors that limited how many people can live on Easter Island?

  2. Do Now What are three factors that might limit the growth of a population of lions on the savannah?

  3. Carrying capacity • The maximum population size of a particular species that an environment can sustain stably • (how many individuals of a population can live happily in a place)

  4. Example of carrying capacity

  5. Carrying capacity can be expressed as population density Population density = population ÷ area

  6. Population growth is limited by: Abiotic factors – non-living things (water, soil, sun) Biotic factors – living things (plants, animals, bacteria)

  7. Population growth is limited by: • Availability of matter and energy (food if you’re an animal, sunlight and nitrogen in the soil if you’re a plant). Also water. • Size of the environment (do you have enough space) • Presence of competing organisms (other organisms competing with you for matter and energy and space • Presence of predators (eating you)

  8. Turn and talk – what factors limited population growth of humans on Easter Island?

  9. Some factors that limit growth depend on population density, some do not • Density independent factors affect populations no matter how dense they are • Natural disasters • Temperature • Sunlight penetrance in the ocean • Human activities • Density dependent factors only affect populations when they reach a certain density • Competition for resources • Disease and parasites • Crowding • stress

  10. When resources are abundant, populations grow exponentially

  11. When resources become limited, populations grow logistically • Population growth stops at the carrying capacity

  12. Exit slip – no notes! • What are three factors that limit population growth?

More Related