BIOL 308 Lecture Notes - Lecture 18: Exponential Growth, Autotroph, Functional Response

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The trophic position is the weighted average of all the pathways of energy flows leading from primary producers to the consumer. For the right chain: 1 + 2 + 3 (=2) you add one and the trophic level is 3. Energy flow hypothesis: higher trophic levels run out of energy. Dynamic stability hypothesis: longer chains are dynamically unstable. Ecosystem size hypothesis: larger ecosystems are more stable. From theoretical models: the longer food chains have longer return times to equilibrium after disturbance. Resilience is the speed at which a community returns to its former state after disturbance. This is a common metric in ecology because it is often used in models. Polls disturbance experiment (you remove a portion of biomass and measure how long it takes for the population to go back to equilibrium) Data: bottom left square: a simpler food web with a lot of short return times to equilibrium. But contradictory hypothesis the longer chain systems are stable.

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