Slide 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? Slide 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) Slide 3 Succession Slide 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. Slide 5 Ecological Succession A series of more-or-less predictable events that occur in a community over time Slide 6 Primary Succession Succession that begins in areas that have no remnants of an older community Slide 7 Pioneer Species The first species to colonize barren areas Lichen Slide 8 Secondary Succession Succession that occurs when a disturbance affects an existing community but doesnt completely destroy it Slide 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. Slide 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. Slide 11 Succession After Human Disturbance ? ? Slide 12 Studying Succession Slide 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 Slide 14 Student Worksheet Answers