Lecture.29.30.Species Interactions.KRG

Lecture.29.30.Species Interactions.KRG - QUI Z: Today Only...

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QUIZ: Today Only on populations and biogeography: lectures 25-28, chapters 54, 55 EXAM: Wednesday Everything since Spring Break up to and including Todays lecture
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So far, we ’ve seen that … Biodiversity and biogeography has a strong historical component Plate tectonics, glaciation, etc. Ecology is also important How species interact with each other and their environment
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We ’ve also seen that … Populations don’t grow exponentially forever Growth is limited to K by ρ -dependent and -independent factors (e.g., 1-N/K) Increasing ρ implies competition among individuals of the same species Intraspecific competition – competition among individuals of the same species
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Intraspecific Competition
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5 But, individuals don’t just interact with only individuals of the same species Predator-prey interactions – wolves and moose Competition among plants species – light, nutrients, moisture, pollinators
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Community ecology … Community – assemblage of species in the same place at the same time How interspecific interactions influence population densities, species distributions, and ultimately lead to evolutionary changes.
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How Can We Organize Interactions?
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8 Interspecific Competition Is Traditionally Viewed as Strong Force Organizing Communities Interaction Effect on Sp. A Effect on Sp. B Competition Negative (-) Negative (-) Foliose and crustose lichen species competing for space
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Competitive Exclusion The principle of competitive exclusion holds that no two species can long coexist sharing the same limiting resource. Competitive exclusion occurs if one species prevents all members of another species from utilizing a resource and the inferior competitor goes locally extinct.
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Interspecific Competition? Hypothesis : Interspecific competition affects distribution and abundance of species Prediction : If interspecific competition affects distribution and abundances, then species grown alone should persist longer and at higher abundance than when grown together with the same resources
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Lecture.29.30.Species Interactions.KRG - QUI Z: Today Only...

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