Biology 3445F Lecture Notes - Lecture 14: Energy Flux, Equilibrium Point, Niche Differentiation
15 Nov 2016
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Bio3445 lec14 stability dn/dt => differential equations. Stability: ability of a system to return to an equilibrium state after temporary disturbance. Just a meta-concepts with different parts to it. Resilience measure of persistence and ability to absorb change and disturbance. Ability of ecosystem to recover after disturbance. Measure ecosystem stability by its resilience; return time to original state after disturbance. Resistance ability to maintain structure or function under disturbance. Measure ecosystem stability by its resistance; degree to which a variable changes after a disturbance. Constancy how variable the system is around an equilibrium point. Systems with high variability are unstable: a lot of death and immigration; can lead to small population, s(cid:373)all populatio(cid:374)s do(cid:374)"t rea(cid:272)t well to distur(cid:271)a(cid:374)(cid:272)e ((cid:272)a(cid:374) suffer de(cid:373)ographi(cid:272) stochasticity) Trophic complexity, redundancy, and food web structure. 1950s: communities w high diversity should be more stable. Species abundance in diverse systems should fluctuate less than simpler systems. 1970s: used math models to show diversity = instability.
