2.1 Species & Populations 2.2 Communities & Ecosystems 2.3 Energy & Matter 2.4 Biomes & Change 2.5 Investigating Ecosystems
"Topic 2 - The Ecosystem Powerpoint" by Guru Charan Kumar
This massive set of notes (835 slides) outlines the entire unit
but is based on the old ESS syllabus so things may be different.