BIOL 308 Lecture Notes - Lecture 22: Weak Interaction, Stoichiometry, Coevolution
Document Summary
Variance allow co-existence of more species, on the same resources. Many weak interaction and few strong interactions in nature. If one of the interaction is woo weak, can generate chaotic 3 level food chain, (one of the species is not consuming enough) Weak links promote community persistence and stability in model food webs. Increasing strength until critical value, stabilize system , the introduced interaction acts like disturbance to dampen the consumer-resource oscillation. Continue to increase, oscillation increase amplitude, system less stable, more prone to extinction. 1 consumer and 2 resource model and preferential predation. There will be switch between resources when the main resource is low. The rate of consuming of less dominant resource is limited by its abundance. When the switch happens, produce collective type iii response (the s shape) (total consumption rate) (at early stage there is a delay between increasing prey number and consumption rate)
