Energy Flow in Ecosystems

1. Energy Flow in Ecosystems Gaiser Life Science

2. Know What are the sources of energy in an ecosystem? “I don’t know anything.” is not an acceptable answer. Use complete sentences. Evidence After listening to the PowerPoint lecture, come back here and list evidence to explain why your answer to the above question is or is not a good answer. You may also use other outside sources to help you respond. Use a web site or a book - Find/draw a food web showing all levels of energy transfer. Use an animal with which you are already familiar. Page #

3. Energy Flow in Ecosystems Information Clarifying ?s Energy roles How organisms get energy or give it to others - makes own food Source of all energy in ecosystems producer Example: algae and plants consumer - gets energy by eating other organisms herbivore - eats only plants Examples: deer, mice, rabbits carnivore - eats only animals Examples: lions, tigers, snakes omnivore - eats both plants and animals Examples: bears, humans, crows decomposer - breaks down dead organisms and waste Examples: bacteria, fungi food chain - transferring energy among organisms Example: algaebugsfishbear food web - overlapping complex transfer of energy among organisms Examples: snake  hawk ( points to who eats it)   frog mouse  grass  fungi energy pyramid - shows energy being transferred between levels Producers - most energy available Consumers - least energy available How much energy is transferred? Only 10% of energy transferred to next level Tertiary (3) hawk 1KcalSecondary (2) rodent 10KcalPrimary (1) bugs 100KcalProducers (P) plants 1000Kcal K = kilo-calories Page # Summary:

5. Energy Flow in Ecosystems Information Clarifying ?s Energy roles How organisms get energy or give it to others - makes own food Source of all energy in ecosystems producer Example: algae and plants consumer - gets energy by eating other organisms herbivore - eats only plants Examples: deer, mice, rabbits carnivore - eats only animals Examples: lion, tiger, snakes omnivore - eats both plants and animals Examples: bear, human, crow decomposer - breaks down dead organisms and waste Examples: bacteria, fungi food chain - transferring energy among organisms Example: algaebugsfishbear food web - overlapping complex transfer of energy among organisms Examples: snake  hawk ( points to who eats it)   frog mouse  grass  fungi energy pyramid - shows energy being transferred between levels Producers - most energy available Consumers - least energy available How much energy is transferred? Only 10% of energy transferred to next level Tertiary (3) hawk 1KcalSecondary (2) rodent 10KcalPrimary (1) bugs 100KcalProducers (P) plants 1000Kcal K = kilo-calories Page # Summary:

6. This PowerPoint was created by Tim Paterek from Charlene Shea’s lecture notes. All pictures came from Google Image Search. To fall within the Fair Use Guidelines, this PowerPoint must be used within the confines of the classroom and may not be published back onto the Internet unless the pictures are removed.