1105 chapter 6 Notes[1]

1105 chapter 6 Notes[1] - BIOL 1105 chapter 6 Notes...

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BIOL 1105 chapter 6 Notes SUCCESSION Succession is the concept that communities proceed through a series of recognizable, predictable changes in structure over time. Succession occurs because the activities of organisms cause changes in their surroundings that make the environment suitable for other kinds of organisms. When new species became established, they compete with the original inhabitants. In some cases the original species entirely replaced completely A climax community is a relatively stable, long-lasting community that is the result of succession . In the traditional view of succession, the kind of climax community that develops is primarily determined by climate. Some communities will be forests , while others will be grassland or deserts. There are two kinds of SUCCESSION: 1. Primary Succession 2. Secondary Succession 1. Primary Succession: begins with a total lack of organisms and bare mineral surfaces or water. Such conditions can occur due to volcanic activities . (scrape away the organisms and soil Primary succession often takes extremely long time because there is no soil and few nutrients for plants and to use for growth. 2. Secondary Succession : that begins with the destruction or disturbance of an existing ecosystem. Generally proceeds more rapidly than primary succession This is true because, although fire, flood, windstorm or human activity can destroy or disturb a community of organisms there is at least some soil and often there are seeds or roots from which plants can begin growing almost immediately. PRIMARY SUCCESSION IN TERRESTRIAL AREA Terrestrial Primary succession : Several factors determine the rate of succession and the kind of climax community that will develop in an area. a. substrate : The kind of substrate will greatly affect the kind of soil that will develop EX: rock, sand, clay.
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b. Reproductive structures: spores, seeds or others will determine the species available to colonize the area. c. The climate will determine the species will be able to live in an area and how rapidly they will grow. The rate of growth will determine quickly organic matter will accumulate in the soil. d. The kind of substrate, climate, and amount of organic matter will influence the amount of water available for plant growth. 1. Pioneer Stages : Bare rock or sand is a very inhospitable place for organisms to live. Temperature changes, no soil, little moisture, organisms exposed to effect of wind, few nutrients are available, few places are available for the organisms to attach themselves or hide. HOWEVER few kinds of organisms can become established and survive in even this inhospitable environment. This collection of organisms is known as the pioneer community because it is the first to colonize bare rock. EX:
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1105 chapter 6 Notes[1] - BIOL 1105 chapter 6 Notes...

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