BIO120H1 Lecture Notes - Lecture 23: Cellulose, Evolutionary Arms Race, Protozoa
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BIO120H1 Full Course Notes
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Trophic level: green plants--autotrophs or primary producers, herbivorous animals--secondary producers or primary consumers, carnivores--tertiary producers or secondary consumers more than one level: omnivores--detritivores or decomposers. Removal experiments in lecture (testing interatction between different trophic levels): Goldenrod beetle: when we take out the goldenrod beetle in the community, the plant diversity decreases (full of yellow goldenrod. But all the beetles are taken out, only g. b. has the big effect on the plant). In most terrestrial communities, there is a lot of plant material that is not consumed by herbivores (the world is green). This is because carnivores keep down herbivores so herbivores don"t limit plant growth. Carnivores have an direct negative effect on herbivores which translate to an indirect positive effect on plants. Branch of hss: graph theory research and (cid:498)network properties(cid:499) of foodwebs (thomson is skeptical because it observed data is inadequate and scarce). Remove anolis lizards from small island: lizard eat spiders (carnivores) and beetles (herbivores).
