ENV100Y5 Lecture Notes - Lecture 18: Biomagnification, Primary Succession, Keystone Species
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ENV100Y5 Full Course Notes
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Document Summary
Implications of low ecological efficiency: takes a lot of grass to make a hamburger. Hypothesis 1: energy transfer, large fraction of energy is lost moving up food chain thus there should be more trophic levels in highly productive ecosystems. Stability: long food chains take a long time to recover from disturbance so stable communities should have longer food chains than unstable ( tree hole communities) Environmental complexity: food chain length is a function of ecosystems physical structure evidence: 2-d are less productive. Food chain: how energy moves up trophic level. Food web: map of feeding relationships and energy flow. They can increase the biodiversity of a community. Succession: predictable series of changes in a community following disturbance. Pioneer species: first too arrive in a primary succession area. Invasive species: non native organisms that spread widely and become dominant in a community.
