EVS 1101 Lecture Notes - Lecture 13: Detritivore, Keystone Species, Ecological Footprint

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Producers: the first trophic level: autotrophs (cid:894)(cid:862)self-feeders(cid:863)(cid:895) = organisms that capture solar energy for photosynthesis to produce sugars (green plants, cyanobacteria, They are responsible for the chemical boundaries: light energy is stored in the o. m. Keystone species: not every species is equally important. 3: creates more niches for certain animals, browsing= time spent eating a tree (herbivores) Ecosystem engineers: organisms that physically modify the environment, beavers, prairie dogs, fungi and bacteria. Succession follows severe disturbance: succession= the predictable series of changes in a community following a disturbance, primary succession= disturbance eliminates all vegetation and/or soil life, secondary succession= disturbance dramatically alters, but does not destroy, all local organisms. Primary succession: o(cid:272)(cid:272)urs (cid:449)he(cid:374) there"s (cid:271)edro(cid:272)k, the first species to arrive in a primary succession are called pioneer species, most often pioneer species is lichen, occurs in glaciers, drying lakes, volcanic lava, contribute to soil formation.

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