BIS 2B Lecture Notes - Lecture 30: Intermediate Disturbance Hypothesis, Character Displacement, Interspecific Competition

• School: UC-Davis
• Department: Biological Sciences
• Course: BIS 2B
• Professor: Schmitt Johanna

Document Summary

Allows species to coexist (ex: character displacement) Leads to increasing diversity when habitat (or resource) diversity is high. Ex: in north american forests, bird diversity increases w/ diversity in foliage height: impacts of succession & disturbance on diversity. Only r-selected disturbance resistant species at high disturbance frequency. Only k-selected species at low disturbance frequency. Coexistence of r & k selected species at middle of disturbance frequency, highest level of diversity. Lighter boulders have higher probability of being turned over; 3 boulder sizes (sml) Species richness greatest on medium sized boulders. Diversity is maximized at intermediate levels of predation. Only competitively dominant species at low density of predators. Only well defended species at high density of predators. Diversity is maximized at intermediate levels of productivity. Few species can survive at low nutrient availability. Competitively dominant species take over at high nutrient availability. Many species coexist at middle nutrient availability, highest diversity: competitive intransitives.