BIOL 2335 Lecture Notes - Lecture 17: Red Algae, Semelparity And Iteroparity, Species Pool
Document Summary
Disturbance, species interactions and diversity: disturbance opens habitat for good colonizers to occupy a habitat, poor competitors, competitive displacement species gradually replaced; best competitor eventually wins, disturbance competitive displacement. If disturbance frequency is medium, both species can coexist: preventing competitive interactions allows coexistence if disturbance frequency is high and long, then. If disturbance is small (small time interval) and frequent, then. Why disturbance can modify diversity, and how this may be related to disturbance frequency. Boulders on sea show are colonized by many organisms. Early colonists tend to be red algae that eventually are outcompeted by several species of green algae and then barnacles and mussels, taking approximately 3 years. Boulders can get turned over by waves, killing most of organisms. Plot expected relationship between boulder size and diversity. Diversity among organisms increases at first until we reach boulders that are too high to flip over.
