Presentation on theme: "CHAPTER 3 Communities and Biomes"— Presentation transcript:
1CHAPTER 3 Communities and Biomes You will identify factors that limit the existence of species to certain areas.You will describe how and why different communities form.You will compare and contrast biomes of the planet earth
2LIVING IN THE COMMUNITY Communities are interacting populations of different species.Abiotic and biotic factors interact and result in conditions that are suitable for life for some organisms and unsuitable for other organismsBiotic - living factorsAbiotic - nonliving factors
3LIMITING FACTORS ---- FOOD ---- PREDATORS ---- TEMPERATURE Environmental factors that affect an organism’s ability to survive its environment.---- FOOD---- PREDATORS---- TEMPERATUREAny biotic or abiotic factor that restricts the existence, numbers, reproduction, or distributions of organisms.
4Range Of ToleranceThe ability of an organism to withstand fluctuations in biotic an abiotic environmental factors.For example:A range of temperaturesA difference of soil typesAmount of sunlightElevation
5SUCCESSION As the land changes Changes over timeOrderly, natural changesSpecies replacements that take place in the communities of an ecosystem.
6Stages of SuccessionDifferent species at different stages create conditions that are suitable for some organisms and not suitable for others.Two types of succession:Primary successionSecondary succession
7Primary Succession Colonization of new sites by communities of organisms. First species in an area are called pioneer plantsExample: LichenA stable mature community that undergoes little or no change in species is a climax community
8Secondary SuccessionCommunity changes that take place after a community is disrupted by natural disasters or human actionsLightning or floodFarmer abandoning a field
9ECOSYSTEMS THAT HAVE SIMILIAR KINDS OF CLIMAX COMMUNITIES. LAND BIOMES: TERRESTRIAL BIOMESLAKE, STREAMS, OCEANS: AQUATIC BIOMES
10Aquatic Biomes Life in the Water Marine BiomesSeparate marine biomes into:ShallowSunlit zonesDeeperUnlighted zonesEstuary: coastal body of water, partially surrounded by land, in which freshwater and saltwater mix.
11Marine Biome The Effects of Tides Twice a day Intertidal zone: The portion of the shoreline that lies between the high and low tides.Tide pools: Pools of water left when the water recedes at low tide, vary greatly in nutrients and oxygen levels from the ocean.Much light but organisms have to contend with the crashing of waves.