1 / 10

Chapter 3

Chapter 3. Communities and Biomes. 3.1 Communities. Community = conditions in one part of the world which are suitable for serving certain organisms Ex: your front lawn

floria
Télécharger la présentation

Chapter 3

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 3 Communities and Biomes

  2. 3.1 Communities • Community = conditions in one part of the world which are suitable for serving certain organisms • Ex: your front lawn • Limiting factors= any abiotic or biotic factor that restricts the existence, number, reproduction, or distribution of organisms • Ex: low temps, high elevation, strong winds, thing soil, sunlight, space • Sometimes factors that limit one population in a community may also have an indirect effect on another population • Ex: water drought = less plants produced = less food for cattle = less food for us

  3. 3.1 Communities • Tolerance = the ability of an organism to withstand fluctuations in biotic and abiotic environmental factors • Ex: corn in drought • Succession = change over time; orderly natural changes and species replacement that take place in the community • If grass was no longer cut on a lawn, what would it look like in one year? 5 years? 90 years?

  4. 3.1 Succession • The grass gets taller; weeds start to grow. The area resembles a meadow. • Later, bushes grow, trees appear and different animals enter the area to live. • The bushes and trees change the environment; less light reaches the ground. The grass slowly disappears. • Thirty years later, the area is a forest.

  5. 3.1 Succession • Primary succession = colonization of barren land by communities of organisms • Land were no living organism are • Ex: volcanoes • 1st species is pioneer species • Ex: Lichens • Eventually the pioneer species dies off soils slowly build up and it leads to a… • Climax community = stable, mature community that undergoes little or no change in species for 100’s of years. • *Doesn’t mean no change just a very little change so that it appears to be none over time

  6. 3.1 Succession • Secondary succession = sequence of changes that takes place after an existing community is severally disrupted. • Previously had life and still has soil; quicker bc different organisms are involved since soils are there • Ex: field that isn’t replanted, building destroyed

  7. 3.2 Biomes • Large group of ecosystem that share the same type of climax community • 2 Types: • Aquatic • Terrestrial

  8. 3.2 Aquatic Biomes • About 75% of earth is covered by water • Marine Biomes = • Photic zone = shallow waters that allow water to penetrate • Ex: bays, rocky shores, sandy beaches • Intertidal zone = between high and low tide where animals are specific to live in the conditions • Ex: star fish, barnacles • Plankton = small organisms that make up the bases of the aquatic food chain • Aphotic zone = deep water with no sunlight • Ex: deepest unexplored parts

  9. 3.2 Aquatic Biomes • Estuary Biomes = costal body of water partially surrounded by land in which fresh and salt water mix • Freshwater Biomes = • Different temperatures bring different organisms • Ex: lake- warm hot water brings cat tales yet when you reach the bottom where it is cold and little sunlight there is no plant life

  10. 3.2 Terrestrial Biomes • Tundra • Taiga • Desert • Grasslands • Temperate • Rainforest

More Related