1. Welcome to Class! 9-8 and 9-9 Complete the following:  Take out Homefun (Carbon and Nitrogen Cycle)  Study for pop quiz now!  Quiz covers:  Symbiosis relationships (mutualism, parasitism, commensalism, predation)  Energy Flow (food chain, web, pyramids of energy 10% rule, biomass, number)  Carbon and Nitrogen Cycle and consequences of disrupting those cycles?

2. Agenda  Lecture notes on Ecological succession  Ecological succession worksheet  Review Symbiosis Relationship if time allow  Homefun:  Ecological Pyramid Lab and foodweb construction Lab (due next class)  Cornell Notes for Friday “Biomes” (not for grade)

3. Succession

4. Learning Objectives  Describe how populations and species diversity change during ecological succession.  Compare succession after a natural disturbance with succession after a human-caused disturbance.

5. Ecological Succession A series of more-or-less predictable events that occur in a community over time

6. Primary Succession Succession that begins in areas that have no remnants of an older community

7. Pioneer Species The first species to colonize barren areas Lichen

8. Secondary Succession Succession that occurs when a disturbance affects an existing community but doesn’t completely destroy it

9. Climax Community A specific, uniform, and stable community at the “end” of succession However... Recent research shows climax communities are not always uniform and stable.

10. Succession After Natural Disturbance September 2004 May 2007 Patches of climax communities may be in different stages of secondary succession due to multiple disturbances.

11. Succession After Human Disturbance ? ?

12. Studying Succession

13. Overview: Succession 1. Secondary succession in healthy ecosystems following a disturbance often reproduces the original. 2. are the first species to colonize barren areas. climax community Pioneer species

14. Student Worksheet Answers