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Published byApril Shepherd Modified over 9 years ago
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Interspecific Competition Superior and inferior competitor Rates of reproduction Rates of growth Tolerance to limiting factors Direct competition
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Mechanisms for superior competition Consumption Preemption Overgrowth Chemical interactions (allelopathy) Territoriality Encounter competition
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Competitive Exclusion Eastern cottontail New England cottontail
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Coexistence of Groton rodents
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How can six species of salamander coexist on Groton School lands?
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Coexistence Resource Partitioning Resource-based models Spatially based models Temporal Models Changes over time (long-term) Low levels of competition allow for extended persistence Limiting Factor Models Predation Disease Parasitism
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Competition and Niche Fundamental Niche Realized Niche Resource Partitioning –Spatial –Resource Selection –Timing?
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Spatial heterogeneity and variation Environmental Gradients Disturbance Soil/bedrock Aspect/topography
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Temporal Variation Parameters that vary predictably over time –Temperature –Moisture –Seed and nut production –Prey population cycles Response of the inferior competitor –Dispersal –Dormancy –Reduction in density
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Predation and Herbivory
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Competition and Evolution Short-term changes –Behavioral Long-term changes –Structural Character Displacement Behavioral plasticity
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How do so many New England carnivores persist in a small area?
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Full Circle Why are the invasive species so successful in this system? How do so many New England carnivores persist in a small area? How can six species of salamander coexist on Groton School lands?
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Competition and Conservation Small Whorled Pogonia Isotria medeoloides
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