BIOL 350 Lecture Notes - Lecture 20: Heritability, Intermediate Disturbance Hypothesis, Density Dependence
Document Summary
Aggressive behavioural exclusion of organisms from spatial territories. Generally considered to be interference, but could also be exploitation. Aggressive social birds, eat sweet substance that physillid insect secrete. When removed, other birds move in and eat insects. Non-territorial aggressive encounters between individuals hat has negative effects on one or both. Principles of evolution by natural s election: variability, heritability, natural selection, survival of the fittest. If there is a trait that all of the females prefer, that will be shown in the prevalence of that trait in future populations. Two species may exploit the same resources at different times of the day or year. If competiting species are affected differently by fluctuation environmental conditions, they may coexist. Ex: bromus mollis does better than erodium botrys under normal conditions, under drought conditions, erodium botrys does better, as long as there keep being periodic droughts, the two will coexist.
