Warm up for today:• Read about autotrophs and heterotrophs on pages 41 & 42. Complete the “Concept Map” from the board.
Flow of Energy • Sunlight is the main source of energy for all life on earth. • Producers –either make their own food from the sun or chemicals (mostly from the sun). –Autotrophs & Chemotrophs
Consumers• Heterotrophs: Organisms that rely on other organisms for food and energy –Herbivores: eat plants –Carnivores: eat other animals –Omnivores: both plants and animals
Consumers – Detritivores: feed on animal remains and other dead matter – Decomposers: break down organic matter
Feeding Relationships• Food chains –Show the one way flow of energy in an ecosystem• Food Webs –Describes all of the possible feeding relationships in an ecosystem
Trophic Levels• Each step in the food chain or food web is called a trophic level.• Ecological pyramid –Shows the relative energy movement through the environment. –Only 10% is available to move onto the next level
Chapter 2 Principles of Ecology 2.2 Flow of Energy in an Ecosystem Ecological Pyramids A diagram that can show the relative amounts of energy, biomass, or numbers of organisms at each trophic level in an organism