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2.5 Food Webs and Ecological Pyramids

2.5 Food Webs and Ecological Pyramids. Ecology Unit. Ecological Niches. An ecological niche refers to the function a species serves within its ecosystem (i.e. what is eats, what eats it, how it behaves) http://www.youtube.com/watch?v=z3eDLQym9qo. Feeding roles of consumers.

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2.5 Food Webs and Ecological Pyramids

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  1. 2.5 Food Webs and Ecological Pyramids Ecology Unit

  2. Ecological Niches • An ecological niche refers to the function a species serves within its ecosystem (i.e. what is eats, what eats it, how it behaves) • http://www.youtube.com/watch?v=z3eDLQym9qo

  3. Feeding roles of consumers Types of consumers

  4. Food chains • A food chain illustrates who eats whom in an ecosystem. It also shows how energy is transferred from one organism to another.

  5. Trophic Level • A trophic levelrefers to position of an organism along a food chain. Producers occupy the first level, herbivores occupy the second level, and carnivoresoccupy the third and fourth levels.

  6. Video about food chains • http://www.youtube.com/watch?v=3Bn7wdCP2v4

  7. Food webs • A food web is more complex and accurate than a food chain as it shows feedings relationships within a community. -they are useful to figure out what other species are affected when a particular species is removed from or added to an ecosystem

  8. Food webs song • http://www.youtube.com/watch?v=sbWyrcY5i3s&feature=related • http://www.youtube.com/watch?v=49nmv4AAmQw&feature=related

  9. Effect of removing species from food web

  10. Ecological Pyramids • An ecological pyramid displays relationships between trophic levels in ecosystems. The three types are energy, numbers and biomass. It shows energy loss and transfer between trophic levels. ENERGY PYRAMID

  11. Comparison of pyramids **Biomass is the mass of living organisms in an area.

  12. Energy Pyramid

  13. Pyramid of numbers • The number of individuals in a food chain

  14. Pyramid of Biomass Biomass is the dry mass of an organism after water is removed from its tissues

  15. Numbers and Biomass Pyramids

  16. Where does energy go? • Some released to environment as thermal energy (heat) • Used for life processes such as growth, reproduction • Species in higher levels have less energy than those at the bottom. This is why there are less organisms at the higher levels.

  17. General Trends for different pyramids • Energy pyramid will always decrease in size from lower to higher trophic levels while this is not the case with number or biomass pyramids • Organisms at lower levels usually have more energy and biomass available to them

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