Energy Flow in Ecosystems Every organism needs energy
- Slides: 8
Energy Flow in Ecosystems • Every organism needs energy to live • A food chain shows the flow of energy in an ecosystem • A network of food chains is called a food web
Food Chains • way of showing feeding relationships among organisms • food chains start with a producer and end with a final consumer • when creating a food chain, the arrows demonstrate the flow of energy in the chain and go from the organism eaten to the organism that eats it
Example – Food Chain grasshopper snake hawk Trophic producer level primary consumer secondary consumer tertiary consumer Niche herbivore carnivore producer
Trophic Levels • Producer (first trophic level) – an organism that can make its own food. • Primary consumers (second trophic level) – herbivores • Secondary consumers (third trophic level) – omnivores/small carnivores • Tertiary consumers (fourth trophic level) – larger carnivores • Scavengers (any level) – feeds on the remains of other organisms
Food Webs • most consumers usually eat many different types of food, and therefore food chains are too simple • these complicated feeding relationships can be modelled with a food web
Food Webs
Ecological Niches • The function a species serves in an ecosystem, including what is eats and how it behaves.
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