BIOL 308 Lecture Notes - Lecture 21: Food Web, Chaos Theory, Limit Cycle
Document Summary
Can produce stable and unstable, non linear dynamics (3 trophic) Chaotic communities are hard to observe in nature, more likely to occur in low complexity models. Constant dilution (affects mortality/emigration), if too high can lead to extinction of one species. Increase in dilution, can create equilibrium between species. Small difference in abundance between species tend to increase in chaotic model (will stay the same in stable or oscillation system) Chaotic system is high sensitivity to small differences (diverge) It delta t (change in time) is big enough, it becomes a linear approximation. Accumulation of mathematical error will grow with time. Negative effect on enemy, positive effect/feedback on itself (lv competition) E. g. the switching between vegetation clear lake and phytoplankton dominate lake through enhancement. Sometimes, even after remove nutrients, the lake is still phytoplankton dominant. Submerged plants prevent turbidity and reinforcing it"s own presence. Shifting the system state is big enough can maintain itself in that state and prevent comebacks.
