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10 - Lecture 10 Population Growth and Interactions 1 Finish...

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9/15/10 1 Lecture 10: Population Growth and Interactions 1. Finish succession 2. Population growth 3. r-selected and k- selected species 4. Population regulation - Abiotic, biotic factors Summary 1 Succession is community change following either _ habitat disturbance _ (secondary succession) or the exposure of _ new substrate _ (primary succession). The initial stages of a successional sere depend on the intensity and extent of disturbance. The end-point (climax) is determined by physical factors (soil, climate, etc.). Summary 2 Early successional species tend to be good colonizers and _ grow rapidlly _; later successional species tolerate ____ _ low resource levels _ and dominate direct interactions with other species. Succession continues until a _ self ___ _ perpetuating _ climax community develops. Summary 3 Trends apparent in many successions include the accumulation of biomass, but diversity peaks in intermediate stages. The nature of the climax is profoundly affected by local conditions, including fire and grazing.
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