28. Ecological Communities скачать в хорошем качестве

28. Ecological Communities

Principles of Evolution, Ecology and Behavior (EEB 122) The idea of ecological communities has changed tremendously over the past forty years. The classical view stated that there were so many different species because evolution packed them tightly into the available niches. The modern view emphasizes the idea of trophic cascades, or top-down control in food chains. This emphasized the importance of predation in ecology, although it downplayed the significance of food webs, which showed the interrelated nature of ecosystems better than simple food chains. 00:00 - Chapter 1. Introduction 01:45 - Chapter 2. The Classical View 04:42 - Chapter 3. Trophic Cascades 23:08 - happier 4. Community Assembly 37:48 - Chapter 5. Meta-communities 44:26 - Chapter 6. Conclusion Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2009.