Ecology: Communities and Trophic Pyramids

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In this video, I go over communities, which are groups of populations of different species, and discuss the predator–prey or consumer–resource interactions between species. These interactions are best illustrated in a trophic pyramid and a food web. The trophic from Greek trophē referring to food pyramid groups biomass based on whether they are autotrophs which obtain energy from the Sun , heterotrophs which consume autotrophs or other heterotrophs , and decomposers which are heterotrophs that feed on waste products or dead bodies of organisms . Typically, just 10% of energy in each trophic level is transferred to the one above, with the remaining 90% being waste, dead material used by decomposers, and as heat lost from metabolism.

biology science communities ecology nature

Timestamps:

- Community is a group of populations of two or more different species in the same area and time – 0:00 - Trophic or food pyramid and food web – 2:30 - Only 10% of energy in each trophic level is consumed; the other 90% is lost as waste, dead material used by decomposers, and heat lost from metabolism – 4:35 - Pyramid of energy for each trophic level – 5:19

Full video below:

- Summary: - Full video and playlist: - Notes: - MES Science playlist: .

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