Lec_17_S07

Lec_17_S07 - Community Ecology Species Interactions...

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Community Ecology Species Interactions Community Structure Species Diversity
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Key Concepts Interactions between species, competition and consumption, have two basic outcomes: affect distribution and abundance, they are agents of natural selection Species assemblages change over time Species diversity is higher in the tropics than at the poles
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Community Interacting species, within a defined area Looking at the scale between biomes and populations Look at species interactions as a + of - interactions
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Classifying species interactions • Competition • Consumption • Mutualism • Commensalism
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Competition • Interspecific • Intraspecific Darwin made initial observations about competition and how it might be responsible for shaping certain species’ characteristics Understanding the meaning of niche
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Competitive Exclusion Principle It is not possible for species with the same niche to coexist Fundamental Niche Realized Niche Mechanism of competition depends on the species and resources involved Fig. 53.5
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Complete exclusion Difference between the Fundamental niche Realized niche Strong Weak
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Competition Exists when there is niche overlap Can result in changes in niche use
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