BIOL 3P85 Lecture Notes - Lecture 8: Stability Theory, Clearwater Lakes, Fitness Function

• School: Brock University
• Department: Biological Sciences
• Course: BIOL 3P85
• Professor: Dan Mc Carthy

Document Summary

Biol 3p85 lecture 8: disturbance regimes, equilibrium and effects. Directional selection: human disturbance acts on fitness & selects for a trait before disturbance: Population is well adapted (fitness is high) when phenotypes are centered on some optimal value. Result most of the population is unfit (maladapted) to new conditions. Red = fitness function acting on a trait (the higher the curve the higher the fitness of a given trait value). Blue = frequency distribution of trait values in the population. P = phenotypic variance u = optimal trait value v 2 = the strength of stabilizing selection around the optimum z = mean trait value. Selection can force a population to decline even if fitness improves the pop could decline to dangerous levels and approach extinction. is. Multi-equilibrium states: the vertical axes represent various factors (e. g. , nutrient availability, exotic species, climatic factors, etc. ).