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Chapter Intro-page 64 What Youll Learn You will identify factors that limit the existence of species to certain areas. Section 3.1 Summary – pages 65-69 Various combinations of abiotic and biotic factors interact in different places around the world. Section 3.1 Summary – pages 65-69 The result is that conditions in one part of the world are suitable for supporting certain forms of life, but not others. Section 3.1 Summary – pages 65-69 Factors that affect an organisms ability to survive in its environment, such as the availability of water and food, predators, and temperature, are called limiting factors. Section 3.1 Summary – pages 65-69 A limiting factor is any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms. Section 3.1 Summary – pages 65-69 Limiting factors Factors that limit one population in a community may also have an indirect effect on another population.
Section 3.1 Summary – pages 65-69 Ranges of tolerance The ability of an organism to withstand fluctuations in biotic and abiotic environmental factors is known as tolerance.
Section 3.1 Summary – pages 65-69 The colonization of barren land by communities of organisms is called primary succession. Section 3.1 Summary – pages 65-69 Primary succession The first species to take hold in an area like this are called pioneer species.

Section 3.1 Summary – pages 65-69 Decaying lichens, along with bits of sediment in cracks and crevices of rock, make up the first stage of soil development. Section 3.1 Summary – pages 65-69 After some time, primary succession slows down and the community becomes fairly stable, or reaches equilibrium. Section 3.1 Summary – pages 65-69 A stable, mature community that undergoes little or no change in species is a climax community. Section 3.1 Summary – pages 65-69 Secondary succession Secondary succession is the sequence of changes that takes place after an existing community is severely disrupted in some way.
Section 3.1 Summary – pages 65-69 Secondary succession Because soil already exists, secondary succession may take less time than primary succession to reach a climax community. 3.2 Section Objectives – page 70 Compare and contrast the photic and aphotic zones of marine biomes. Section 3.2 Summary – pages 70-83 A biome is a large group of ecosystems that share the same type of climax community. Section Objectives: Explain how limiting factors and ranges of tolerance affect distribution of organisms.
New soil makes it possible for small weedy plants, small ferns, fungi, and insects to become established.

Secondary succession, however, occurs in areas that previously contained life, and on land that still contains soil.
Primary succession is the colonization of barren land by pioneer species, such as moss or lichens. Soil must be present on this land, and the species that grow will differ from pioneer species.
Section Objectives: Identify the major limiting factors affecting distribution of terrestrial biomes.
Tolerance refers to an organisms ability to withstand fluctuations of environmental factors.

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